C# Microsoft.Office.Interop.Excel引出的数据不能计算怎么办，如何用VBA实现，可加到200分。

private void btnExport_Click(object sender, EventArgs e)
{
int iRows = 0;
int iCols = 0;
int iTrueCols = 0;

Microsoft.Office.Interop.Excel.Application app = new Microsoft.Office.Interop.Excel.Application();
Microsoft.Office.Interop.Excel.Workbook wb = app.Workbooks.Add(System.Reflection.Missing.Value);
Microsoft.Office.Interop.Excel.Worksheet ws = null;
if (wb.Worksheets.Count > 0)
{
ws = (Microsoft.Office.Interop.Excel.Worksheet)wb.Worksheets.get_Item(1);
}
else
{
wb.Worksheets.Add(System.Reflection.Missing.Value, System.Reflection.Missing.Value, System.Reflection.Missing.Value,

System.Reflection.Missing.Value);
ws = (Microsoft.Office.Interop.Excel.Worksheet)wb.Worksheets.get_Item(1);

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