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determining what subset of the underlying data source to retrieve based on the current page index Figure 7-9 shows a sample custom paging data grid in action
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: Addison Wesley : February 11, 2003 Figure 7-9 Custom Paging DataGrid in Action : 0-201-76040-1 : 432
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"This well-conceived and well-written book has extensive knowledge and priceless experience overflowing from its pages It captures the true essence of ASPNET and walks the reader to a high level of technical and architectural skill"-J Fred Maples, Director of Software Engineering, NASDAQcom Essential ASPNET with Examples in C# is the C# programmer's definitive reference for ASPNET through version 11 It provides experienced programmers with the information needed to fully understand the technology, and is a clear guide to using ASPNET to build robust and well architected Web applications This book begins with a discussion of the rationale behind the design of ASPNET and an introduction to how it builds on top of the NET framework Subsequent chapters explore the host of new features in ASPNET, including the server-side compilation model, code-behind classes, server-side controls, form validation, the data binding model, and custom the DataGrid declaration supporting custom paging examples illustrate Listing 7-5 shows the page with control development Throughout the book, working (additional style best practices not building Web-based applications in C# has been set to true, and the PageSize has attributes are for shown) Note that AllowCustomPaging
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been explicitly specified, in addition to AllowPaging and the PageIndexChanged handler necessary for Among the topics explored in depth are: standard paging Listing 7-5 Page with a DataGrid Implementing Custom Paging ASPNET architecture
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<! File: DataGridPageaspx > Configuration <%@ Page language="C#" Debug="True" Src="DataGridPageaspxcs" Inherits="DataGridPage" %> HTTP pipeline <html> <body> Diagnostics and error handling <form runat="server"> <asp:DataGrid id=_gd1 Width="90%" Data binding Runat="server" AllowCustomPaging='true' Custom controls AllowPaging='true' OnPageIndexChanged="Grid_Change" Caching PageSize=10 State management /> </form>
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</body> [ Team LiB ] </html>
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Listing 7-6 shows the code-behind class that implements the logic behind the custom paging DataGrid When this page is loaded for the first time, it queries the data source to discover how many items are in the collection to be displayed by the paged DataGrid This number is assigned to the VirtualItemCount of the DataGrid so that it knows how many pages of data there are and can change the page navigation indicators appropriately The total count of items is obtained via a private method called GetItemCount that issues a "SELECT COUNT(*)" query to discover the number of rows in the underlying table The logic for the GetItemCount function varies from application to application depending on the underlying data source, but this is one common approach Perhaps the most important piece of logic in this class is provided by the BindGrid() method, used to populate the DataGrid whenever necessary This function issues a query against the data source for Table of Contents precisely the number of rows necessary to display the current page Again, the logic in this function varies from application to application In this particular application, the ID field of the Employees table is a linear Essential ASPNET with Examples in C# indexer, so to retrieve records 11 through 20, you can query the table for records whose IDs range from 11 ByFritz Onion through 20
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Publisher Finally, the : Addison Wesley Grid_Change method is our handler for the PageIndexChanged event of the DataGrid In it, Pubassign the CurrentPageIndex property of the DataGrid to the incoming NewPageIndex of the : February 11, 2003 we Date
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DataGridPageChangedEventArgs parameter We also calculate the beginning index of the underlying ISBN : 0-201-76040-1
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data Pagessource: to be retrieved by taking the current page index (plus 1), multiplying it by the page size, and 432 subtracting the result from the total VirtualItemCount This starting index is saved in a field of our class called _startIndex, used during the BindGrid method to retrieve the correct rows from the underlying table
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"This well-conceived and well-written book has extensive knowledge and priceless experience overflowing Listing pages It captures Class Implementing Custom Paging Logic from its 7-6 Code-Behind the true essence of ASPNET and walks the reader to a high level of technical and architectural skill"-J Fred Maples, Director of Software Engineering, NASDAQcom
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// File: DataGridPageaspxcs Essential ASPNET with Examples in C# is the C# programmer's definitive reference for ASPNET through public class DataGridPage : programmers with the information needed to fully understand the version 11 It provides experienced Page { technology, and is a clear guide to using ASPNET to build robust and well architected Web applications private int _startIndex = 0;
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This book begins with a discussion of the rationale behind the design of ASPNET and an introduction to how protected DataGrid _gd1; it builds on top of the NET framework Subsequent chapters explore the host of new features in ASPNET, including the server-side compilation model, code-behind classes, server-side controls, form validation, the protected void Page_Load(object Src, EventArgs e) data binding model, and custom control development Throughout the book, working examples illustrate { best practices for building Web-based applications in C# if (!IsPostBack)
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Among the topics explored in depth are: _gd1VirtualItemCount = GetItemCount();
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