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BeginExecuteReader(AsyncCallback, Object) method

Initiates the asynchronous execution of a SQL statement that is described by this SA Command, and retrieves the result set, given a callback procedure and state information.

Visual Basic

Public Function BeginExecuteReader( _
ByVal callback As AsyncCallback, _
ByVal stateObject As Object _
) As IAsyncResult

C#

public IAsyncResult BeginExecuteReader(
AsyncCallback callback,
object stateObject
);

• callback  An  AsyncCallback delegate that is invoked when the command's execution has completed. Pass null (Nothing in Microsoft Visual Basic) to indicate that no callback is required.

• stateObject  A user-defined state object that is passed to the callback procedure. Retrieve this object from within the callback procedure using the  IAsyncResult.AsyncState.

An  IAsyncResult that can be used to poll, wait for results, or both; this value is also needed when invoking EndExecuteReader(IAsyncResult), which returns an SADataReader object that can be used to retrieve the returned rows.

• SACommand class
• SACommand members
• BeginExecuteReader methods
• EndExecuteReader method
• SADataReader class