c# - Using InvokeRequired vs control.InvokeRequired

Question

What is the difference between InvokeRequired and somecontrol.InvokeRequired?

like this,

delegate void valueDelegate(string value);

private void SetValue(string value)
{
   if (InvokeRequired)
   {
       BeginInvoke(new valueDelegate(SetValue),value);
   }
   else
   {
       someControl.Text = value;
   }
}

and

delegate void valueDelegate(string value);

private void SetValue(string value)
{   
    if (someControl.InvokeRequired)
    {
        someControl.Invoke(new valueDelegate(SetValue),value);
    }
    else
    {
        someControl.Text = value;
    }
}

Answer 1

The first version checks the thread responsible for this control. The second version checks the thread responsible for someControl. (And ditto for which control's thread they then delegate the invocation to.)

They could potentially be different - although they really shouldn't be if the two controls are in the same top-level window. (All controls in one window should be running on the same thread.)