我是想把DataGridView中的数据写到EXCEL中去。
从网上找的程序中用到了dgvShow。程序如下：
private void ToExcel_Click(object sender, EventArgs e)
        {
            Microsoft.Office.Interop.Excel.ApplicationClass MyExcel = new                        
            Microsoft.Office.Interop.Excel.ApplicationClass();
            MyExcel.Visible = true;
            if (MyExcel == null)
            {
                MessageBox.Show("EXCEL无法启动！", "错误", MessageBoxButtons.OK,   
                MessageBoxIcon.Error);
                return;
            }
            int rowcount = 0;
            int columncount = 0;
            MyExcel.Application.Workbooks.Add(true);
            columncount = this.dgvShow.ColumnCount;
            rowcount = this.dgvShow.RowCount;
            for (int m = 1; m < columncount; m++)
            {
                MyExcel.Cells[1, m] = this.dgvShow.Columns[m-1].HeaderText;//去除dgvShow的编号列
            }
            for (int i = 0; i < rowcount; i++)
            {
                for (int j = 1; j < columncount; j++)
                {
                    MyExcel.Cells[i + 2, j] = Convert.ToString(this.dgvShow[j-1, i].Value);
                }
             }
        }
但是VS2008却提示：
错误    1    “graduata_v2.Form1”不包含“dgvShow”的定义，并且找不到可接受类型为“graduata_v2.Form1”的第一个参数的扩展方法“dgvShow”(是否缺少 using 指令或程序集引用?)  
不知道什么原因，请大侠指点啊，多谢多谢。

dgvshow是DataGridView的命名而已