I have problem with Timeout, when I run a command through app, a timeout exception is thrown, but when I run i directly in sql there is no timeout exception!

my SP take about 11 min when I run it directly. for solving this issue, I found below code here, but I doesn't work properly! Immediately after beginExecute, IAsyncResult.iscomplete become true !!!!

where is the problem ?

IAsyncResult result = command.BeginExecuteNonQuery();

    int count = 0;
    while (!result.IsCompleted)
    {
        Console.WriteLine("Waiting ({0})", count++);
        System.Threading.Thread.Sleep(1000);
    }
    Console.WriteLine("Command complete. Affected {0} rows.",
    command.EndExecuteNonQuery(result));

regards