private void button3_Click(object sender, EventArgs e)
 {
     string message = "";
     var client = new DoctorServiceClient();
     var doctor = client.GetDoctor(docId);
     var ret = client.DeleteDoctor(ref doctor, ref message);
     if(!ret)
     {
         new Thread(() => new ErrorWindow(message).ShowDialog()).Start();
     }
     else
     {
         dataGridView1.Rows.Clear();
         FillTable();
     }
 }