Thread thread = new Thread(method);

        

ThreadStart method = delegate()
             {
                 //Clipboard.SetText(str);                //System.Windows.Forms.IDataObject dataObject = Clipboard.GetDataObject();
                 Clipboard.SetDataObject(str);
                 //if (dataObject != null)//&& dataObject.GetDataPresent(DataFormats.Text)
                 //{
                 //    //ret = dataObject.GetData(DataFormats.Text);
                 //    dataObject.SetData(DataFormats.Text, str);
                 //}
             };
             if (Thread.CurrentThread.GetApartmentState() != ApartmentState.STA)
             {
                 Thread thread = new Thread(method);
                 thread.SetApartmentState(ApartmentState.STA);
                 thread.Start();
                 thread.Join();
             }
             else
             {
                 method();
             }