BeginFill Method

In This Topic

Starts an asynchronous invocation of the Fill() method.

Syntax

Visual Basic
C#

'Declaration
 
Public Function BeginFill( _
   ByVal callback As AsyncCallback, _
   ByVal stateObject As Object _
) As IAsyncResult

public IAsyncResult BeginFill( 
   AsyncCallback callback,
   object stateObject
)

Parameters

callback: The delegate to call when the asynchronous invoke is complete. If callback is a null reference (Nothing in Visual Basic), the delegate is not called.
stateObject: State information that is passed on to the delegate.

Return Value

An System.IAsyncResult interface that represents the asynchronous operation started by calling this method.

Remarks

Refer to "Asynchronous Query Execution" topic for detailed information.

If the suspended fetch is stopped with EndFill method, the BeginFill method will start the fetch from the point where the fetch was stopped. To make BeginFill starting the query from the beginning, use the CancelFetch method.

Example

The following example demonstrates how to use the BeginFill method.

csharp

static void UseDataTable(DbDataTable myDataTable, DbConnection myConnection) {

  myDataTable.Connection = myConnection;
  myDataTable.SelectCommand = myConnection.CreateCommand();
  myDataTable.SelectCommand.CommandText = "SELECT * FROM Dept";

  IAsyncResult aRes = myDataTable.BeginFill(null, null);

  Console.Write("Fetch in process");

  Thread.Sleep(100);
  myDataTable.SuspendFill(true);
  Console.Write("Fetch is stopped");

  myDataTable.EndFill(aRes);
  Console.Write("All records are fetched");
}

Visual Basic

Private Shared Sub UseDataTable3(ByVal myDataTable As DbDataTable, ByVal myConnection As DbConnection)
  myDataTable.Connection = myConnection
  myDataTable.SelectCommand = myConnection.CreateCommand
  myDataTable.SelectCommand.CommandText = "SELECT * FROM Dept"
  Dim result1 As IAsyncResult = myDataTable.BeginFill(Nothing, Nothing)
  Console.Write("Fetch in process")
  Thread.Sleep(100)
  myDataTable.SuspendFill(True)
  Console.Write("Fetch is stopped")
  myDataTable.EndFill(result1)
  Console.Write("All records are fetched")
End Sub

Reference

DbDataTable Class
DbDataTable Members
EndFill Method
SuspendFill Method

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