//button is clicked
//worker starts

private void processWorker_DoWork(object sender, DoWorkEventArgs e)
{
     string code = DoLongWorkAndReturnCode();

     if (code != 0)
     {
         MessageBox.Show("Error!");
         EnableAllButtons(); // this is defined in the other thread and it's where i run into the error.
     }
     else
     {
          string code = DoAnotherLongProcessAndReturnCode(); 
          if (code != 0)
          {
               MessageBox.Show("Error 2!");
               EnableAllButtons(); // again, this is defined in the other thread
          }
     }
}

I'm running into a cross threading error because "EnableAllButtons()" is defined in a different thread.

How do I go about enabling all buttons in one thread, from a different thread?