'Declaration
 
Public Overloads Function BeginExecuteReader( _
   ByVal callback As AsyncCallback, _
   ByVal state As Object, _
   ByVal behavior As CommandBehavior _
) As IAsyncResult

'Usage
 
Dim instance As TdCommand
Dim callback As AsyncCallback
Dim state As Object
Dim behavior As CommandBehavior
Dim value As IAsyncResult
 
value = instance.BeginExecuteReader(callback, state, behavior)

public IAsyncResult BeginExecuteReader( 
   AsyncCallback callback,
   object state,
   CommandBehavior behavior
)

public:
IAsyncResult^ BeginExecuteReader( 
   AsyncCallback^ callback,
   Object^ state,
   CommandBehavior behavior
) 

Parameters

callback

Delegate that will be invoked after the processing of the request has completed. If one is not required a null is specified.

state

User defined object. This object is available to the callback procedure by accessing the IAsyncResult.AsyncState property.

behavior

One of the Data.CommandBehavior enumerations values.

Return Value

The call to BeginExecuteReader returns after the request has been successfully sent to Teradata. Any exceptions that are generated by the provider while initializing the request will be thrown during the call to BeginExecuteReader. Exceptions that are generated by the provider or Teradata during the processing of the request will be thrown when TdCommand.EndExecuteReader is called.

The DDL statement CREATE PROCEDURE cannot be specified in an asynchronous execution. If it has been specified a TdException will be thrown when TdCommand.EndExecuteReader is called.

A connection can only have one active request. Therefore, if an asynchronous request is being processed by the provider an exception will be thrown when an attempt is made to start another asynchronous request.

The TdCommand.CommandTimeout property is not applicable to asynchronous execution and will be ignored when a command is asynchronously executed.

If behavior is Data.CommandBehavior.SchemaOnly, BeginExecuteReader will execute the command synchronously.

Refer to TdCommand.ExecuteReader for more information.

Reference

TdCommand Class
TdCommand Members
Overload List