private void button4_Click(object sender, EventArgs e)
 {
     frmNewClientForm addClient = new frmNewClientForm();
     try
     {
         this.Hide();
         addClient.ShowDialog();
     }
     catch
     {
         this.Hide();
         addClient = new frmNewClientForm();
         addClient.ShowDialog();
     }
 }
 private void cmbBoxClientName_SelectedIndexChanged(object sender, EventArgs e)
 {
     try
     {
         if (cmbBoxClientName.SelectedIndex == 1)
         {
             frmNewClientForm newClient = new frmNewClientForm();
             newClient.ShowDialog();
         }
     }
     catch (Exception ex)
     {
         MessageBox.Show("Unexpected error occurred while running");
     }
 }