"Kentonis" wrote:

> I have the following invocation in my application:
>
> private delegate void InitializeDataDelegate();
>
> /// <summary>Loads information from the database.</summary>
> public void InitializeData()
> {
> if(InvokeRequired)
> {
> Invoke(new InitializeDataDelegate(this.InitializeData));
> }
> else
> {
> blah...blah...blah
> }
> }
>
> Sometimes, this asserts as so:
>
> EventMananager Callback.
> Message: Specified cast is not valid.
>
> Stack Trace: at System.Windows.Forms.Control.MarshaledInvoke( Control
> caller, Delegate method, Object[] args, Boolean synchronous)
> at System.Windows.Forms.Control.Invoke(Delegate method, Object[] args)
> at System.Windows.Forms.Control.Invoke(Delegate method)
> at XXXX.XXX.XXX.MyBaseForm.InitializeData() in c:\myfile.cs, line xxx
> ...
> at EventManager.EventHandlerThread() ...
>
> I am not sure what cast is invalid as I have no parameters in my Invoke
> call. Could it be the delegate method itself? The documentation says I
> could call Invoke with the object args as null, but that seems to me to be
> the same thing as not passing a second parameter at all. This happens very
> infrequently so I have not been able to repeat the process and find out what
> is happening.
>
> Can anyone shed some light on this for me?
>
> Thanks,
>
> Ken
>