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To determine whether custom pagination is better than automatic paging with caching, you need to evaluate the way you use data. The larger the amount of data the GridView is using, the more likely you ll need to use custom pagination. On the other hand, the slower the database server and the heavier its load, the more likely you ll want to reduce repeated calls by caching the full data object. Ultimately, you may need to profile your application to determine the optimum paging strategy.

The ObjectDataSource is the only data source to support custom pagination. The first step to take control of custom paging is to set ObjectDataSource.EnablePaging to true. You can then implement paging through three more properties: StartRowIndexParameterName, MaximumRowsParameterName, and SelectCountMethod.

To have the GridView create the correct number of page links for you, it must know the total number of records and the number of records per page. The records-per-page value is set with the PageSize property, as in the previous example. The total number of pages is a little trickier. When using automatic pagination, the total number of records is automatically determined by the GridView based on the number of records in the data source. In custom paging, you must explicitly calculate the total number using a dedicated method. The following procedure shows how you can retrieve the number of records of the Employees table and return the count:

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Django doesn t provide any features for automatically discovering or generating a URL structure for any site. Instead, each site and application is expected to explicitly declare whatever addressing scheme is most appropriate using URL configurations. This isn t a limitation it s a feature that allows you to define your site s addresses the way you d like. After all, sites on the Web are like real estate; your Web framework shouldn t determine your floor plan. Defining a URL configuration may seem quite simple, but there s a bit going on that merits some special attention, especially since Django s own tools aren t the only way to define this configuration. The implementation lives at and provides two functions that work together to manage URL configurations.

public int CountEmployees() { // Create the Command and the Connection. string sql = "SELECT COUNT(*) FROM Employees"; SqlConnection con = new SqlConnection(connectionString); SqlCommand cmd = new SqlCommand(sql, con); con.Open(); // Execute the command and use the return value for the // VirtualItemCount property. Datagrid1.VirtualItemCount = (int)cmd.ExecuteScalar(); con.Close(); } This example uses the COUNT() aggregate function to calculate the number of records in the table and returns that information using the ExecuteScalar() method of the Command object. This method is bound to the ObjectDataSource using the SelectCountMethod property: <asp:ObjectDataSource ID="sourceEmployees" runat="server" EnablePaging="True" SelectCountMethod="CountEmployees" ... /> When you use custom paging, the SelectCountMethod is executed for every postback. If you want to reduce database work at the risk of providing an incorrect count, you could cache this information and reuse it.

The next part of the solution is a little trickier. Instead of retrieving a collection with all the employee records, the GetEmployees() method must retrieve records for the current page only. To accomplish this feat, this example uses a stored procedure named GetEmployeePage. This stored procedure copies all the employee records into a temporary table that has one additional column a unique autoincrementing ID that will number each row. Next, the stored procedure retrieves a selection from that table that corresponds to the requested page of data, using the supplied @Start and @Count parameters. Here s the complete stored procedure code: CREATE PROCEDURE GetEmployeePage @Start int, @Count int AS -- create a temporary table with the columns we are interested in CREATE TABLE #TempEmployees ( ID int IDENTITY PRIMARY KEY, EmployeeID int, LastName nvarchar(20), FirstName nvarchar(10), TitleOfCourtesy nvarchar(25), ) -- fill the temp table with all the employees INSERT INTO #TempEmployees ( EmployeeID, LastName, FirstName, TitleOfCourtesy ) SELECT EmployeeID, LastName, FirstName, TitleOfCourtesy

FROM Employees ORDER BY EmployeeID ASC -- declare two variables to calculate the range of records -- to extract for the specified page DECLARE @FromID int DECLARE @ToID int -- calculate the first and last ID of the range of records we need SET @FromID = @Start SET @ToID = @Start + @Count - 1 -- select the page of records SELECT * FROM #TempEmployees WHERE ID >= @FromID AND ID <= @ToID GO

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