Online Data Entry Jobs
One of the reasons that so many controls are provided, of course, is to make data entry simpler and more accurate. TextBox controls are always an easy choice, but the time spent choosing and implementing controls that more closely match the way the user thinks about the data will be richly rewarded.
To demonstrate how to use the Data Form Wizard. In this demonstration, you will learn how to use the Data Form Wizard to create a data-bound form from a new DataSet. In this demonstration, you will learn how to use the Data Form Wizard to create a data-bound form from a new DataSet.
We will add two forms to our MainApp project that inherit from the base data form we just created in the previous section. After adding the two new forms, we will move on to implementing the specific functionality that makes the Add View Edit Products screen unique. Try It Out - Inheriting from the Base Data Form
So, you need to replace Forml with your Data Form Wizard's form name. In this example, Listing 4-6 replaces Forml with DataForml in the Main method. NOTE If you've modified the name of your Data Form Wizard-generated form, you need to call that form instead of DataForml.
To explain how to use the Data Form Wizard to generate a data-bound form. You can use the Data Form Wizard to automatically bind data to controls on a form. You can use the Data Form Wizard to automatically bind data to controls on a form. You can specify to use an existing DataSet in the project, which will then use your pre-written methods for data access, or to create a new DataSet based on information supplied to the wizard. If you wish to create a new DataSet, the Data Form Wizard will require the following information
You can add an item to your Visual Studio .NET projects called the Data Form Wizard. This item uses a wizard interface to step you through creating a DataSet that you will then use to create a data-driven Windows Form. Using this wizard to create your form can save you a lot of time because it creates the data-bound controls for you. If you have previously worked with Microsoft Access, using wizards to create interactive data forms will be familiar to you. You will find the Data Form Wizard item by right-clicking on the project's name in the Solution Explorer window and selecting Add New Item. The Data Form Wizard item is located within the Data folder of the Add New Item window. When you first add this item, a wizard window opens to help you configure your Windows Form. The first step in setting up your data-centric form is to declare the DataSet you plan to attach this form to. You can either use an existing DataSet, or you can create a brand new DataSet while you are using the Data...
Data-driven development focuses on storing application structures in a database and deriving application functionality from the data structure itself, though few applications are entirely data-driven. A Laboratory Information Management System (LIMS) system is one such type of application. Users of a LIMS system need to create definitions for various data elements they require in the process of laboratory research. It is, in effect, a scaled-down version of the Visual Studio IDE. You must dynamically generate data tables and drag and drop controls on a form. Each of the data elements may require data validation that's written in C or VB.NET source code and compiled at runtime to check the data and provide feedback to those performing data entry to the system. Normally, you'll never need to use data-driven programming in such an extensive fashion. A more common use of these techniques is found in off-the-shelf applications that give you some level of customization that the software...
Much of the logic and code used to build the user interface for a browser-based .NET application resides (and runs) on a Web server, rather than on the computer at which the user is sitting. The browser-based GUI is dynamically built by your ASP.NET application, which transmits Hypertext Markup Language (HTML) to the browser. The GUI may be supplemented with some client-side script to provide ease of usability, increased responsiveness, data-entry validation, and dynamic display effects, but the bulk of the interface is controlled by server-based code to which the client Web-browser does not have direct access. In effect, the client uses HTML, supplemented by dynamic HTML (DHTML), to present the user interface. Although the server-side code depends on the .NET Framework to build the GUI, it produces browser-agnostic HTML. Consequently, the client computer may not need to have the .NET Framework installed.
To help himself come to a conclusion about business feasibility, Jack decides to develop a few screen shots of the application. How will the data entry clerk use the application How will the sales manager use the application Jack uses a graphical design program to create a few screens. After he is able to see for himself that the user interface could be quite simple, Jack comes to the conclusion that the RPM system really would make things easier for the business. The overall goal for the coupon-entry user interface is simplicity. Jack calculates that it will take only ten seconds to enter the coupon information for each retailer, as opposed to the two minutes it takes using the current accounting system. The amount of time saved will greatly reduce the workload of the data entry clerks. In addition, the system will provide additional flexibility for creating and managing promotions in a way that does not currently exist within BWI, and this potentially could lead to increased sales....
You are creating a new Web page that collects customer data. This Web page needs to capture customer names and addresses, plus indicators of which customers are active. You also need to display several vertical market categories and give the data entry person the ability to place the customer into all matching categories. You also prompt the data entry person for the quantity of computers that the customer has, based on sever ranges, such as 0-5, 6-50, 51-250, 251-1000, and 1001 or more.
Now you are ready to design the data entry part of the Web page, or what is better known as a Web form. The Web form is the part of a Web page used to communicate with the Web server. Information entered into it is packaged up in an HTTP request and sent to the server when the Submit button is clicked. The server then sends back an HTTP response. Chapters 10 and H cover Web forms in great detail.
Another useful control offered by DNN is the SectionHead control that creates a collapsible panel on a data entry form. This panel appears frequently in the DNN modules and is useful when you don't want to waste space on the page with something the user won't always need.
An alternative to the manual data entry involves integrating our site with Microsoft Passport services, specifically Passport Express Purchase. The Express Purchase service allows us to collect all the information we will need about a Customer using the information they have stored in their Microsoft Wallet account. During processing, we actually leave the gasTIX site and navigate over to Passport where the user can log in, select the information we need to collect and return to our site with all the data. The data is returned in an HTML Form Post, so we can easily access everything from the Request.Form object.Website
Now that we have our Add View Edit Products and Suppliers screens set up, let's investigate how we can validate user input using a complex binding technique. The ErrorProvider control can be bound to a DataSet to check for certain errors in the data entered by the user, and will give the user a suitable visual indicator in the event of a data entry error.
In this recipe we will see how to move beyond the basic View, Edit, and Settings controls to create a second View control. We'll start with the Datagrid project from Chapter 6, Data Entry Tricks and add a new control to it. Then in the next recipe we'll see how to navigate to the new control from the Datagrid.
We can make similar changes to each of the methods in the bank client application to ensure invalid data entry is trapped locally and exceptions are handled safely. Using the Message property of an exception gives you a great opportunity to provide useful information to a client for example, you can even suggest alternative courses of action to the user, such as logging on to a different server.
In general, it is the process of modifying existing rows in a data store that is most likely to create a concurrency error. The process of deleting rows is usually less error-prone, and less likely to cause data inconsistencies in your database. Likewise, providing data entry programs are reasonably clever about how they create the values for unique columns, the process of inserting new rows is generally less of a problem.
The second button on our page calls the server-side routine CancelEntry, and the user would click this button to abandon data entry and close the page. This button also has to submit the page to the server, but when client-side validation is in use (the default on most scriptenabled browsers) the user can't submit the page while it contains invalid values. In other words, a traditional Submit button that we might use as a Cancel button to abandon the page will still cause validation to occur and prevent the page from being submitted.
OLTP systems perform well for data-entry purposes, but usually fail to perform well when used for extensive reporting. The reason is that reports typically need to gather data from a large number of tables, and joining many tables usually slows down the report generation process. DSS applications, on the other hand, are specifically optimized for reporting. When we build DSS applications, we add a level of redundancy to our data by de-normalizing the appropriate tables. For example, we may decide to copy the customer name column into a purchase history table so that we don't have to join to the customer table for a purchase history report. Conversely, DSS applications do not perform as well as OLTP applications for data gathering purposes. In an OLTP system, we would not want to duplicate the customer name column in the purchase history table, because every time a customer makes a purchase, we would need to write extra data (customer name) into that table. One of the common mistakes...
ASP.NET controls are designed to be accessible by default. For example, login controls such as Login, ChangePassword, PasswordRecovery, and CreateUserWizard use text boxes with associated labels to help a user who uses a screen reader or who does not use a mouse. These controls also use input controls with tab index settings to make data entry without a mouse easier.
You'll find that as you determine the audience and application requirements, you'll also build a vision of the application that you can communicate to the various people involved. Not everyone needs exactly the same vision, and not everyone wants or needs to know about the application in its entirety. You'll probably want to articulate the vision differently to different individuals, depending on their interests. For example, describing to a senior manager how the network architecture of your application will reduce resource contention doesn't constitute a shared vision, but the same language may greatly interest a network administrator. Discussions of database relationships with a database administrator may win you friends, but the same vision, when shared with a high-level manager, a salesperson, or a data-entry clerk, may only tag you as a consummate bore.
Have to press the Tab key several times before they can focus again on the desired control. This makes the data entry inconvenient and time-consuming. On analyzing further usage data, you found that all the users in your company use Internet Explorer 5.0 or above to access your application. What should you do to eliminate the problems reported by the users
However, there are several problems with this approach. First, you may not always want to force users to correct their errors immediately you may want to let them complete an entire form of entries and just force them to resolve any problems before submitting or saving the data. This allows rapid data entry for people who spend their days repeatedly filling out the same form over and over. In those cases, if they are tabbing from field to field, they don't have to constantly look at the form to see if the focus wasn't allowed to shift to the next control because of a validation failure.
The first thing we will need to do, before we write a single line of code, is to determine what type of reports we want to deliver in our Web application and how they are going to be used. Are they listing or grouped reports Are they used to check data entry in a form before submitting it What will the reports look like Will users want to print the reports from their browser or export to another format such as PDF, RTF, or Excel All of these questions can help you gather the information you need to design your reports and get a handle on how they are going to be delivered.
The Sorting tab of the Options dialog contains several options that determine how to sort entries. The Non-spacing marks option allows you to ignore non-spacing characters. For example, the circumflex (A) that appears in e would affect the sort order if you didn't select this option. Another option tells the help compiler to ignore any symbols in the help file when sorting. This is handy if you want to create a non-specialized index for a data entry program or other general application. On the other hand, it would actually get in the way when creating an index for a reference help file. Many C functions begin with an underscore. Ignoring those underscores would make the function difficult to find. Finally, you can choose something other than commas and colons to separate index entries. The only time you'd need this feature is if you wanted to create a help file based on the output of another application that doesn't support the standard separators.
RequiredFieldValidator This is the easiest of validators to understand. If the target control is blank, the validator displays an error message. Some developers will use an asterisk in place of the error message and simply display one error message for all required fields. However, the use of a custom error message for each control means that you can provide example input for each data entry control.
There's one more synchronization item to consider. What happens if the user types a new value into the detail form If that change doesn't appear in the Grid view, then the change is lost. By now, you should know that the first step in resolving this issue is to change the Modifiers property of all the data entry fields to Public. Once the fields are public, you can access their TextChanged event as shown here
Choosing columns to display on the Data Form Wizard Step 9 Choosing the Display Style Figure 4-64. Choosing columns to display on the Data Form Wizard Step 9 Choosing the Display Style This page is an important part of creating your form. Actually, the Data Form Wizard adds a Windows form with some controls on it and writes code to fill, update, delete, and navigate data. There are two ways to view the data, and you choose your option on this page. These two options are Data Form Wizard Figure 4-65. Choosing between a grid and individual controls on the Data Form Wizard Data Form Wizard Figure 4-68. Data Form Wizard-generated form for the Single Record in Individual Control option Figure 4-68. Data Form Wizard-generated form for the Single Record in Individual Control option After your selection of data display style, you click Finish button. The Data Form Wizard adds the Windows form DataForml and the class DataForml.cs corresponding to it.
Creating data-aware forms involves two stages. First, you need to make VB.NET aware that a data source is available to it. Second, you need to build the form with the Data Form Wizard. Thankfully, both of these stages are combined through the use of the Data Form Wizard.
After clicking Next in the Data Form Wizard at the end of the previous section, you would have been presented with a window asking you what data columns you want to display on the subsequent form. Figure A-11 The field selection page of the Data Form Wizard Figure A-12 Data display page of the Data Form Wizard alphabetically rather than how they are defined in the database table, so you probably will always need to rearrange the forms that are generated by the Data Form Wizard. Also, if earlier in the process you commented out the menu code that references this form, be sure to return to that code and reactivate it. Then, build your solution and run it to see what it looks like. The running application should look similar to that shown in Figure A-13.
Select the add windows form menu item that appears in the pop-up menu after you click the first-level add option. As before (refer to Figure A-6), you will select the add new windows form option. However, this time, in the subsequent window, you will select the Data Form Wizard option rather than the default of Windows form.
You've already seen that you can add a data connection to your project from within the Data Form Wizard. Those data connections are automatically available in Server Explorer as well. You can also add a data connection directly from Server Explorer, as described in Step by Step 5.13.
The next page lets you define a relationship between the Customers and Orders tables. It's useful to provide a relationship between tables when you have a masterdetail relationship database. In other words, a customer may have many orders associated with it, so there is a relationship through the CustomerID in the Orders table joined to information about the customer in the Customers table. Now, say you want to see all the orders of a customer based on the CustomerID. If you do this manually, you need to write code to select data from the Orders table to correspond to a CustomerID and then fill data to the form. If you use Data Form Wizard instead, it does everything for you. Neat, huh
A form is a container to provide a site for controls (and components in general). Each form is a window in its own right. You can add menus to forms, write to the surface of a form, and add controls. The Windows Forms designer makes adding controls and setting their properties simple, but it is not mandatory. In addition, the Add Class dialog gives you the Data Form wizard, which will take you step-by-step through the process of creating a form with a data grid bound to a data source.
You can use the ErrorProvider control to alert a user to a data entry error by displaying an unobtrusive small error icon. The ErrorProvider control allows you to show an error message related to a control without bringing up a message box that stops the user's flow of information entry. The ErrorProvider provides three properties to all of the controls on a form that allow you to monitor the controls for errors. The properties the provider adds to controls are Error, IconAlignment, and IconPadding. Typically, you use the ErrorProvider with text box controls because they provide a free-flow information entry area that can easily contain errors.
SQL Server offers a feature called extended propertiesthat you can use to add metadata to your data objects. You can do this visually by right-clicking the object, as shown in Figure 7-1. Select the Extended Properties entry on the left side of the tab, and you see a simple data-entry form where you can name properties and enter values for them in a key value pair relationship.
The System.CodeDom.Compiler namespace contains all the functionality you need to compile source code dynamically. There are several reasons you may wish to do this. In systems where users can define their own data-entry fields, you may also wish to let them define their own validation logic. You can accomplish this by building a user interface to a rules-based engine that checks for a predetermined number of scenarios. This can be presented as a wizard that prompts the user for, say, a range of values between xand y or perhaps greater than less than a certain value. If the rule is violated during data entry, a message box appears. Such a wizard is shown in Figure 3-1.
Listing 9-4 uses all of the templates described in Table 9-2 except SeparatorTemplate. ItemTemplate and AlternatingItemTemplate are identical, except for the background color on the tags. HeaderTemplate contains the start tag of the HTML table element as well as a row of headers. FooterTemplate contains the row that holds the image to allow you to add a new record, as well as the HTML table end tag. RepeaterTest.aspx includes several HTML anchor tags to link to another form, named EditCustomer.aspx. More on that form later in this chapter, in the section 'Creating Data Entry Pages.'
Most applications developed today are synchronous. That is, when passing a task off to another component to perform, the application waits patiently for the task to complete before continuing. An example of this would be the process that occurs after a user saves a record in a data entry application. Typically, the application sends the data on to a relational database such as SQL Server and then waits for the database update to complete no matter how long that takes. Most database transactions such as this have built-in timeouts to give up after a set number of seconds or minutes have passed.
The Contact Management application allows users to add information about new contacts through the AddContact Web form. The AddContact Web form is a straightforward data entry form with text boxes for each of the data items in a Contact table record. When complete, the AddContact Web form will appear as shown in Figure 5-24. To create the AddContact data entry Web form To create the AddContact data entry Web form
Error trapping is easier than ever before. Unlike Visual C++ and Visual Basic where there are a number of ways to detect errors, C uses a single standard method. This means that developers can standardize error-trapping routines and reduce the complexity of finding and eradicating problems like data entry errors.
In the previous chapter, we created a Connection object by using the DataAdapter Configuration Wizard. The Data Form Wizard, accessed by clicking Add Windows Form on the Project menu, also creates a Connection automatically. In this chapter, we'll look at several other methods for creating Connections in Microsoft Visual Studio .NET.
It's been said that the only way to write a perfect data input program is to eliminate the users. While you probably don't want to go that far, you should recognize that the single greatest source of bad data is bad programs. The best data entry programs don't let users enter invalid data. Less elegant but still acceptable programs let users know when they do enter invalid data, but neither type accepts invalid data. In contrast, bad programs not only let users enter invalid data, they also skip the validation, invariably resulting in data integrity problems, expensive fixes, angry clients, and a lot of trouble all around.
MM any Windows applications are really just attractive window dressing over a relational database. This is especially true of the internal software that powers most businesses. The chief responsibility of this type of software is to allow highly structured data entry and to generate reports that summarize vast quantities of information.
Although the data entry on this page is extensive, it is not very complicated. Most entry fields are simple TextBox server controls. The only other controls on this page, besides the Button server controls at the bottom, are the Shipping State, the Billing State, and the Credit Card Type fields which are the DropDownList server controls we covered in the previous section.
The most common requirement for a dynamic Web application is getting the user's input, processing it, and providing feedback in the event of data-entry errors. HTML provides basic support for many widgets, including text boxes, drop-down lists, list boxes, check boxes, and radio buttons as well as traditional buttons and submit buttons. This basic HTML support for forms was the building block for Active Server Pages (ASP) developers, who were able to add additional processing and validation to user input in HTML forms. Validation especially is different in HTML forms than in traditional Microsoft Windows application forms. For instance, 5 35 2001 isn't correct input when a date is required. Unlike a Microsoft Visual Basic 6.0 application or a Windows Forms application, your ASP.NET application can't conveniently create forms with masked inputs that will make invalid entries impossible. There is no ASP.NET equivalent for the DateTimePicker control in the Windows Common Controls, which...
The .NET UserControl is very much the same as the User control concept found in earlier versions of Visual Basic. Essentially, a UserControl is a simple method for creating a composite control consisting of one or more controls. Because the UserControl class derives from the ContainerControl base class, it inherits all the focus management and control management implemented by the ContainerControl. Control management entails hosting child controls and managing the events of the child controls. In essence, a UserControl is a fully self-contained control that also generally includes some amount of business logic such as data entry validation and even database access if necessary.
Many applications find it useful to attempt several operations at once, testing each, and then recording those that fail. For example, gasTlX requires the validation of both the shipping and billing addresses. In order to provide a better user experience, gasTlX validates both addresses in the OrderRules class regardless if one fails, or any other business rule for that matter. The user is able to correct all data entry errors at once rather than rely on the fix one error, resubmit the request approach.
As mentioned earlier it is not always necessary to physically divide these layers, although it can certainly help to logically divide applications. The presentation layer displays information to the end user and provides a means for data entry. Just below this layer is the facades layer that shields the presentation layer and developer from the complexity of the application implemented in the Business Level Layer (BLL). The Business Level Layer provides all of the application's functionality including most business rules, validation, and control of application-specific functionality such as credit card transactions. The Data Access Layer (DAL) provides all data access to application data while the database in the data services tier provides data storage and implements simple data specific business rules.
This is the basic edit control for Windows programs you use it wherever a user needs to input text. You can use this control in a view class for editing plain text files or for displaying text where only one font and point size are necessary. The most useful application of the edit box control is in dialog boxes, where data entry usually does not need the capabilities of the rich edit control.
The finished Data Form displays all the data from the Customers table. It also provides a button to let you choose when to load the data. You might want to browse through the code that the wizard created behind this form. Be warned, though, that there are more than 200 lines of code involved in implementing this functionality. Obviously, the Data Form Wizard can save you a lot of time in building data bound forms. Building a Multiple-Table Data Form The Data Form Wizard can also build a form that displays data from more than one table. Step by Step 5.12 shows you how.
Set the new form as the start page for the project and run the project to experiment with the data form. Figure 5.10 shows the finished Data Form created by this Step by Step 5.11. When you first load the form, it contains only the Load button. Clicking the Load button loads and binds the data to the user interface.
You have created a data entry form for a Visual Basic database application. When the user clicks the OK button on your form, you call a procedure named FormSave that writes the modified data to a SQL Server database. When users close the form using ALT+F4, your FormSave procedure is not being called. What should you do to ensure that the FormSave routine is always called when the form is closed
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