Ends an asynchronous invocation of the ExecuteNonQuery method.
Public Function EndExecuteNonQuery( _ ByVal result As _ ) As
public EndExecuteNonQuery( result );
For UPDATE, INSERT, and DELETE statements, the return value is the number of rows affected by the command. For all other types of statements, the return value is -1.
The function ends an asynchronous execution of a query that is started with BeginExecuteNonQuery. A pair of asynchronous functions (BeginExecuteNonQuery and EndExecuteNonQuery) can be used instead of the synchronous function ExecuteNonQuery to gain more performance and flexibility in your application.
Refer to "Asynchronous Query Execution" article for detailed information.
In the example below an easiest way of executing an asynchronous operation is shown. First, all components are set up and a connection is opened. Second, a query execution is started. The operation state (done or in progress) is checked and a report is written to the console. At last query result is rendered.
static void Async_Exec(DbConnectionBase myConnection)
DbCommandBase myCommand = (DbCommandBase)myConnection.CreateCommand();
myCommand.CommandText = "UPDATE Test.Dept SET DName='New Department' WHERE DeptNo=10";
Console.WriteLine("Starting asynchronous query execution...");
IAsyncResult cres = myCommand.BeginExecuteNonQuery(null, null);
Console.WriteLine("Have to wait for operation to complete...");
int RowsAffected = myCommand.EndExecuteNonQuery(cres);
Console.WriteLine("Done. Rows affected: " + RowsAffected.ToString());
catch (Exception e)
Console.WriteLine("An exception has occurred: " + e.Message);
Public Sub Async_Exec(ByVal myConnection As DbConnectionBase)
Dim myCommand As DbCommandBase = myConnection.CreateCommand()
myCommand.CommandText = "UPDATE Test.Dept SET DName='New Department' WHERE DeptNo=20"
Console.WriteLine("Starting asynchronous query execution...")
Dim cres As IAsyncResult = myCommand.BeginExecuteNonQuery(Nothing, Nothing)
If cres.IsCompleted Then
Console.WriteLine("Have to wait for operation to complete...")
Dim RowsAffected As Integer = myCommand.EndExecuteNonQuery(cres)
Console.WriteLine(String.Concat("Rows affected: ", RowsAffected.ToString()))
Catch e As Exception
Console.WriteLine(String.Concat("An exception has occurred: ", e.Message))
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