private void cbCompany_SelectedIndexChanged(object sender, EventArgs e) { lblCompanyName.Visible = true; Company comp = new Company(); DataTable dt = null; string companyId = string.IsNullOrEmpty(cbCompany.ValueMember) ? string.Empty : Convert.ToString(((DataRowView)(cbCompany.SelectedItem)).Row[cbCompany.ValueMember]); if (!string.IsNullOrEmpty(companyId)) { dt = comp.SelectCompanyById(companyId); lblCompanyName.Text = dt.Rows[0]["CompanyName"].ToString(); } }