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MSEXCEL.Application excelapp=new Microsoft.Office.Interop.Excel.Application();
object objOpt = System.Reflection.Missing.Value;
MSEXCEL.Workbook exceelDoc = excelapp.Workbooks.Open(this.saveFileDialog1.FileName, objOpt, false, objOpt, objOpt, objOpt, true, objOpt, objOpt, true, objOpt, objOpt, objOpt, objOpt, objOpt);
MSEXCEL.Worksheet ws = (MSEXCEL.Worksheet)exceelDoc.Sheets[1];
MSEXCEL.Range r;
r = ws.get_Range("单元格横坐标", "单元格纵坐标");
r.Value2 = this.comboBox1.SelectedText;
exceelDoc.Save();