public void FillCompanyCombo()
 {
     try
     {
         BusinessManager BM = new BusinessManager();
         cboxCompany.AutoCompleteSource = AutoCompleteSource.ListItems;
         //cboxCompany.DropDownStyle = ComboBoxStyle.DropDownList;
         cboxCompany.DisplayMember = "CompanyName";
         cboxCompany.DataSource    = BM.BALFillCompanyCombo().Tables[0];
     }
     catch (Exception ex)
     {
         MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
     }
 }