using Excel;


 Application app = new Application();
            if (app == null)
            {
                return;
            }
            app.Visible = false;
            app.UserControl = true;
            Workbooks workbooks = app.Workbooks;
            _Workbook workbook = workbooks.Add(XlWBATemplate.xlWBATWorksheet
            Sheets sheets = workbook.Worksheets;
            _Worksheet worksheet = (_Worksheet)sheets.get_Item(1);
            if (worksheet == null)
            {
                return;
            }
          [color=#FF0000]  worksheet.get_Range(worksheet.Cells[1, 1], worksheet.Cells[1,3]).Merge(Missing.Value); //横向合并[/color]            worksheet.get_Range(worksheet.Cells[1, 1], worksheet.Cells[1, 1]).Value2 = "导出EXCEL测试一";

 Excel.Application xlApp = new Excel.Application();
  Excel.Workbook workbook = xlApp.Workbooks.Add(true);
            Excel.Worksheet worksheet = (Excel.Worksheet)workbook.Worksheets[1];
            Excel.Range range;
            Excel.Range range2;
  range = worksheet.get_Range(xlApp.Cells[1, 1], xlApp.Cells[RowCount + 1, colCount]);

------解决方案--------------------
你是装的Excel2003么？11.0的版本是指2003

------解决方案--------------------
我把应用程序的目标框架改成  .net 2.0  
就好了

------解决方案--------------------
哥们我真的很佩服你

------解决方案--------------------
asp.net里面使用 Excel.Application 不是很好