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Automatic paging works with any data source that implements ICollection. This means that the SqlDataSource supports automatic paging, as long as you use DataSet mode. (The DataReader mode won t work.) Additionally, the ObjectDataSource also supports paging, assuming your custom data access class returns an object that implements ICollection arrays, strongly typed collections, and the disconnected DataSet are all valid options. Automatic paging doesn t reduce the amount of data you need to query from the database. Instead, all the data is retrieved and bound every time the user navigates to another page. In other words, if you split a table into ten pages and the user steps through each one, you will end up performing the same work ten times (and multiplying the overall database workload for the page by a factor of ten). Fortunately, you can make automatic paging much more efficient just by switching on automatic caching for the data source control (see 11). This allows you to reuse the same data object for multiple requests. Of course, storing the data in the cache may not be the ideal solution if you re using paging to deal with an extremely large query. In this case, a prohibitively large amount of server memory is required to keep your data in the cache. That s when custom pagination makes sense.

Here s the complete HTTP handler code: Public Class ImageFromDB : Implements IHttpHandler Public Sub ProcessRequest(ByVal context As HttpContext) Implements IHttpHandlerProcessRequest Dim connectionString As String = WebConfigurationManagerConnectionStrings("Pubs")ConnectionString ' Get the ID for this request Dim id As String = contextRequestQueryString("id") If id Is Nothing Then Throw New ApplicationException("Must specify ID") End If ' Create a parameterized command for this record Dim con As New SqlConnection(connectionString) Dim SQL As String = "SELECT logo FROM pub_info WHERE pub_id=@ID" Dim cmd As New SqlCommand(SQL, con) cmdParametersAddWithValue("@ID", id) Try conOpen() Dim r As SqlDataReader = cmdExecuteReader(CommandBehaviorSequentialAccess) If rRead() Then Dim bufferSize As Integer = 100 ' Size of the buffer Dim bytes As Byte() = New Byte(bufferSize - 1) {} ' The buffer Dim bytesRead As Long ' The # of bytes read.

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EventArgs e) { string connectionString = WebConfigurationManagerConnectionStrings["Pubs"]ConnectionString; SqlConnection con = new SqlConnection(connectionString); string SQL = "SELECT logo FROM pub_info WHERE pub_id='1389'"; SqlCommand cmd = new SqlCommand(SQL, con); try { conOpen(); SqlDataReader r = cmdExecuteReader(CommandBehaviorSequentialAccess); if (rRead()) { int bufferSize = 100; byte[] bytes = new byte[bufferSize]; long bytesRead; long readFrom = 0;.

Custom pagination requires you to take care of extracting and binding only the current page of records for the GridView. The GridView no longer selects the rows that should be displayed automatically. However, the GridView still provides the pager bar with the autogenerated links that allow the user to navigate through the pages. Although custom pagination is more complex than automatic pagination, it also allows you to minimize the bandwidth usage and avoid storing a large data object in server-side memory. On the other hand, almost all custom pagination strategies requery the database with each postback, which means you may be creating more work for the database.

Dim readFrom As Long = 0 ' The starting index ' Read the field 100 bytes at a time Do bytesRead = rGetBytes(0, readFrom, bytes, 0, bufferSize) contextResponseBinaryWrite(bytes) readFrom += bufferSize Loop While bytesRead = bufferSize End If rClose().

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.

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