exception from hresult 0x800a03ec c# while print excel

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.NET3.0

C#

.NET

WPF

Hi..

As i want Print the Particular Excel Sheet from excel file.i wrote some coding to print Excel sheet but i got some errors while print the document.

Error Details

exception from hresult 0x800a03ec

My Code:

Excel.Application excelApp = new Excel.Application();
            // Open the Workbook:
           // Excel.Workbook wb = excelApp.Workbooks.Open(@"C:\My Documents\Book1.xls", Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing,Type.Missing, Type.Missing, Type.Missing, Type.Missing);
            string dtime;
            dtime = day + "-" + month + "-" + year;
            Excel.Workbook wb = excelApp.Workbooks.Open("D:\\Saved Sheets\\" + lblusername + "\\" + file_name + "-" + dtime + ".xlsx", Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing);
            // Get the first worksheet.
            // (Excel uses base 1 indexing, not base 0.)
            Excel.Worksheet ws = (Excel.Worksheet)wb.Worksheets[1];
            // Print out 1 copy to the default printer:
           //ws.PrintOut(Type.Missing, Type.Missing, Type.Missing, Type.Missing,Type.Missing, Type.Missing, Type.Missing, Type.Missing);
            ws.PrintOutEx(Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing);
            // Cleanup:
            GC.Collect();
            GC.WaitForPendingFinalizers();

            Marshal.FinalReleaseComObject(ws);

            wb.Close(false, Type.Missing, Type.Missing);
            Marshal.FinalReleaseComObject(wb);

            excelApp.Quit();
            Marshal.FinalReleaseComObject(excelApp);

How can i solve this Problem Please sent solution ASAP.
Thank You.