private void button3_Click(object sender, EventArgs e)
 {
     //remove contact
     int index = dataGridView1.CurrentRow.Index;
     TestServiceClient client = new TestServiceClient();
     try
     {
         int number = Convert.ToInt32(dataGridView1.Rows[index].Cells[1].Value.ToString());
         client.Open();
         client.DeleteContact(number);
         client.Close();
     }
     catch (Exception ex)
     {
         MessageBox.Show(ex.ToString());
     }
 }