/// <summary>
/// Extends BeginInvoke so that when a state object is not needed, null does not need to be passed.
/// <example>
/// sendorpostcallback.BeginInvoke(state, callback);
/// </example>
/// </summary>
public static IAsyncResult BeginInvoke(this SendOrPostCallback sendorpostcallback, Object state, AsyncCallback callback)
{
if (sendorpostcallback == null)
{
throw new ArgumentNullException("sendorpostcallback");
}
return(sendorpostcallback.BeginInvoke(state, callback, null));
}