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            object oMissing = Missing.Value;

            Microsoft.Office.Interop.Excel.Application ExcelObj =
                new Microsoft.Office.Interop.Excel.Application();

            Microsoft.Office.Interop.Excel.Workbook WBook;

            Microsoft.Office.Interop.Excel.Worksheet WSheet;

            Microsoft.Office.Interop.Excel.Range Selection;

            WBook = ExcelObj.Workbooks.Open(@"c:\test\1.xlsx",

                oMissing, oMissing, oMissing, oMissing, oMissing,

                oMissing, oMissing, oMissing, oMissing, oMissing,

                oMissing, oMissing, oMissing, oMissing);