Visual Studio displays the data items separated by the comma and a space. in VS .NET

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Visual Studio displays the data items separated by the comma and a space.
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Increase the width of the control to about the width of a browser page. Press F5.
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Visual Studio displays the page in the default browser.
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Close the browser. Close the form designer.
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Whenever performance and scalability are issues, it s important to limit the amount of data displayed on a single page. For usability reasons, you should always limit the amount of data that is displayed, no matter what the environment users don t appreciate having to wade through masses of data to find the single bit of information they require. One common technique in the Internet environment for limiting the amount of data on a single Web page is to display only a fixed number of rows and allow the user to move forward and backward through the DataSet. This technique is usually referred to as paging. The Web form DataGrid control provides intrinsic support for paging by using the three methods shown in Table 13-4. Table 13-4: DataGrid Paging Methods Method Default Description Displays either Next and Previous buttons or page numbers as part of the DataGrid; the CurrentPageIndex property is updated by the DataGrid Navigation buttons are outside the grid, and the CurrentPageIndex property is set manually Navigation
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Default
Paging/Custom Navigation
Custom Paging
Table 13-4: DataGrid Paging Methods Method Description buttons are outside the grid, and all paging is handled within application code The simplest method is, of course, to use the DataGrid control s Default Paging/Default Navigation method, but the custom options are only slightly more difficult to implement. DataGrid paging is controlled by two of its properties. The PageSize property, which defaults to 10, determines the number of items to display. The CurrentPageIndex property determines the set of rows that will be displayed when the page is rendered. Though it doesn t control paging, the read-only property PageCount returns the total number of pages of data in the data source. When the user selects either one of the default navigation buttons, ASP.NET raises a PageIndexChanged event. The event arguments parameter of this event includes a NewPageIndex property. Rendering the new page in the DataGrid is as simple as setting the DataGrid control s CurrentPageIndex property to the value of NewPageIndex and calling the DataBind method. Implement Default Paging in a DataGrid Control
Visual Basic .NET
1. In the Solution Explorer, right-click DataGrid.aspx, and then on the context menu, select Set as Start Page. 2. In the Solution Explorer, double-click DataGrid.aspx. Visual Studio displays the page in the form designer. 3. Select the DataGrid, and then click Property Builder in the bottom pane of the Properties window. Visual Studio displays the Property Builder. 4. Select Paging in the left pane of the Property Builder. Visual Studio displays the Paging properties.
5. Select the Allow Paging check box, and then set the Page Size property to 5 rows.
6. Click OK. 7. Press F7 to display the code editor. 8. Select dgCategories in the Control Name combo box, and then select PageIndexChanged in the Method Name combo box. Visual Studio adds the event handler to the code. 9. Add the following lines to the procedure: 10. Me.dgCategories.CurrentPageIndex = e.NewPageIndex DataBind() 11. Press F5. Visual Studio displays the page in the default browser. 12. Click the Next ( > ) button. Visual Studio displays the remaining 3 rows in the DataGrid.
13. Close the browser. 14. Close the code editor and the form designer.
Visual C# .NET
1. In the Solution Explorer, right-click DataGrid.aspx, and then on the context menu, select Set as Start Page. 2. In the Solution Explorer, double-click DataGrid.aspx. Visual Studio displays the page in the form designer. 3. Select the DataGrid, and then click Property Builder in the bottom pane of the Properties window. Visual Studio displays the Property Builder.
4. Select Paging in the left pane of the Property Builder. Visual Studio displays the Paging properties.
5. Select the Allow Paging check box, and then set the Page Size property to 5 rows.
6. Click OK. 7. Display the DataGrid events in the Properties Window, and doubleclick the PageIndexChanged property. Visual Studio opens the code editor window adds the event handler to the code. 8. Add the following lines to the procedure: 9. this.DataGrid1.CurrentPageIndex = e.NewPageIndex; DataBind(); 10. Press F5. Visual Studio displays the page in the default browser. 11. Click the Next ( > ) button. Visual Studio displays the remaining 3 rows in the DataGrid.
12. Close the browser. 13. Close the code editor and the form designer. Web forms don t implement a BindingContext property that maintains a reference to a current position in a data source. It s easy enough, however, to maintain a Position property, stored either in the Session state or in the Page object s ViewState, and handle the data manipulation manually. You might use this technique, for example, if you want to display only a single row on the Web page, but allow the user to navigate through all the rows by using the same navigation buttons that are typically available on a Windows form. Implement Manual Navigation on a Web Form
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