private void frmAddUser_Load(object sender, EventArgs e) { DataAccess da = new DataAccess(); try { DataSet ds = da.getAllLoaiNhanvien(); string UserGroupName; int intRowsCount = ds.Tables[0].Rows.Count; for (int i = 0; i < intRowsCount; i++) { UserGroupName = Convert.ToString(ds.Tables[0].Rows[i]["TenLoaiNV"]); cboUserGroupName.Properties.Items.Add(UserGroupName); } } catch (Exception ex) { lblStatusBar.Text = ex.Message; } lblStatusBar.Text = ""; }