急 C#DataTable导出成Execl 总是提示object未包含"get_Range"的定义解决方案

急 C#DataTable导出成Execl 总是提示object未包含"get_Range"的定义
各位高手请帮帮忙，在下面红色区域总是提示：object未包含"get_Range"的定义，导致导出数据失败
 try
            {
                System.Data.DataTable objDtResult = new System.Data.DataTable();
                objDtResult.Columns.Add("姓名");
                objDtResult.Columns.Add("性别");
                objDtResult.Columns.Add("年龄");
                objDtResult.Columns.Add("身份证号");

                objDtResult.Columns.Add("职业工种");

                objDtResult.Columns.Add("工作单位");

                objDtResult.Columns.Add("套餐名称");

                objDtResult.Columns.Add("企业分组");

                //指定数据源
                string m_strSerName = string.Empty;//套餐名
                string m_strGroup = string.Empty;//分组名
                string m_strSex = "男,女";
                string m_strEnterprise = this.m_objViewer.m_dgvEnterpriseDetail.Rows[0].Cells["entname_vchr"].Value.ToString();
                for (int intI = 0; intI < this.m_objViewer.m_dgvEnterpriseDetail.Rows.Count; intI++)
                {
                    if (intI == 0)
                    {
                        m_strSerName = this.m_objViewer.m_dgvEnterpriseDetail.Rows[intI].Cells["sername_vchr"].Value.ToString();
                        m_strGroup = this.m_objViewer.m_dgvEnterpriseDetail.Rows[intI].Cells["entgroupname_vchr"].Value.ToString();
                    }
                    else
                    {
                        m_strSerName += "," + this.m_objViewer.m_dgvEnterpriseDetail.Rows[intI].Cells["sername_vchr"].Value.ToString();
                        m_strGroup += "," + this.m_objViewer.m_dgvEnterpriseDetail.Rows[intI].Cells["entgroupname_vchr"].Value.ToString();
                    }
                }
                string saveFileName = "";
                SaveFileDialog saveDialog = new SaveFileDialog();
                saveDialog.DefaultExt = "xls";
                saveDialog.Filter = "Excel文件|*.xls";
                saveDialog.FileName = "";
                saveDialog.ShowDialog();
                saveFileName = saveDialog.FileName;
                if (saveFileName.IndexOf(":") < 0) return; //被点了取消 
                Microsoft.Office.Interop.Excel.Application xlApp = new Microsoft.Office.Interop.Excel.Application();
                if (xlApp == null)

                {
                    MessageBox.Show("无法创建Excel对象，可能您的电脑未安装Excel");
                    return;
                }

                Microsoft.Office.Interop.Excel.Workbooks workbooks = xlApp.Workbooks;
                Microsoft.Office.Interop.Excel.Workbook workbook = workbooks.Add(Microsoft.Office.Interop.Excel.XlWBATemplate.xlWBATWorksheet);
                Microsoft.Office.Interop.Excel.Worksheet worksheet = (Microsoft.Office.Interop.Excel.Worksheet)workbook.Worksheets[1];//取得sheet1 

                //新方法
                iCare.Pub.Utility.clsExcelExporter m_objExcelExporter = new Pub.Utility.clsExcelExporter();
                m_objExcelExporter.m_mthExport(saveFileName);

                //写入标题
                for (int i = 0; i < objDtResult.Columns.Count; i++) 
                {
                    worksheet.Cells[1, i + 1] = objDtResult.Columns[i].ColumnName;//myDGV.Columns[i].HeaderText;
                }
                //指定格式
                worksheet.get_Range(worksheet.Cells[2, 2], worksheet.Cells[1000, 2]).Validation.Add(Microsoft.Office.Interop.Excel.XlDVType.xlValidateList, Microsoft.Office.Interop.Excel.XlDVAlertStyle.xlValidAlertStop, Type.Missing, m_strSex, Type.Missing);
                worksheet.get_Range(worksheet.Cells[2, 6], worksheet.Cells[1000, 6]).Validation.Add(Microsoft.Office.Interop.Excel.XlDVType.xlValidateList, Microsoft.Office.Interop.Excel.XlDVAlertStyle.xlValidAlertStop, Type.Missing, m_strEnterprise, Type.Missing);
                worksheet.get_Range(worksheet.Cells[2, 7], worksheet.Cells[1000, 7]).Validation.Add(Microsoft.Office.Interop.Excel.XlDVType.xlValidateList, Microsoft.Office.Interop.Excel.XlDVAlertStyle.xlValidAlertStop, Type.Missing, m_strSerName, Type.Missing);
                worksheet.get_Range(worksheet.Cells[2, 8], worksheet.Cells[1000, 8]).Validation.Add(Microsoft.Office.Interop.Excel.XlDVType.xlValidateList, Microsoft.Office.Interop.Excel.XlDVAlertStyle.xlValidAlertStop, Type.Missing, m_strGroup, Type.Missing);
                worksheet.Columns.EntireColumn.AutoFit();//列宽自适应
                if (saveFileName != "")
                {
                    try
                    {
                        workbook.Saved = true;
                        workbook.SaveCopyAs(saveFileName);
                        //fileSaved = true;
                    }
                    catch (Exception ex)
                    {
                        MessageBox.Show("导出文件时出错,文件可能正被打开！\n" + ex.Message);
                    }

                }

                xlApp.Quit();
                xlApp = null;
                GC.Collect();//强行销毁 
                MessageBox.Show("操作成功", "提示", MessageBoxButtons.OK);
            }
[解决办法]
参考：
“呵呵，就应当用Range这个才对。“
http://topic.csdn.net/u/20101206/09/81a314d4-f655-41fc-9766-575668a51bb3.html
[解决办法]
worksheet.get_Range((object)worksheet.Cells[2, 2]
我用这个解决了问题