验证   dlbDataGridView 中的 "dldm" 为能为空       private void dlbDataGridView_CellValidating(object sender, DataGridViewCellValidatingEventArgs e)        {            if (dlbDataGridView.Columns[e.

for (int i = dtbl.Rows.Count - 1; i >= 0; i--)  dtblSell.Rows.RemoveAt(i);

把类 ReportClass 引入项目using System;using System.Collections.Generic;using System.Data;using System.Data.SqlClient;using System.Drawing.Imaging;using System.Drawing.Printing;using System.IO;

在 DataGridView 中有添加一按钮列：BtnInfo 单击该按钮时显示出所在行的 TariffID  private void dgv_CellClick(object sender, DataGridViewCellEventArgs e) { if (e.ColumnIndex != -1)