Why am I getting this error:“Cross-thread operation not valid: Control lbFolders accessed from a thread other than the thread it was created on.”?

Question

This is baffling me, maybe somebody can shine the light of education on my ignorance. This is in a C# windows app. I am accessing the contents of a listbox from a thread.

Answer 1

Try this:

private delegate void xThreadCallBack();
private void ThreadCallBack()
{
    if (this.InvokeRequired)
    {
        this.BeginInvoke(new xThreadCallBack(ThreadCallBack));
    }
    else
    {
        //do what you want
    }
}

Though, the answer with the lambda expression would suffice.