private void btnAddOffice_Click(object sender, EventArgs e)
 {
     //this.Visible = false;
     Frm_OfficeMaster F = new Frm_OfficeMaster();
     F.ShowDialog();
     //this.Visible = true;
     FillOffice();
     cboOffice.Focus();
 }
 private void officeToolStripMenuItem_Click(object sender, EventArgs e)
 {
     Frm_OfficeMaster F = new Frm_OfficeMaster();
     F.ShowDialog();
 }