How to open Excel file in C# Winform Application with Read Only protection?

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C#

C#4.0

MS-Excel

Office-Interop

I have opened Excel file in my C# Winform Application adding reference to Microsoft.Office.Interop.Excel.dll and using DSO FRAMER CONTROL.But i want to open my excel file with read only protection.I have sucessfully done this for WORD Application like this

Microsoft.Office.Interop.Word.Document wordDoc =  (Microsoft.Office.Interop.Word.Document)axFramerControl1.ActiveDocument;
Microsoft.Office.Interop.Word.Application wordApp = wordDoc.Application;
wordDoc.Protect(Microsoft.Office.Interop.Word.WdProtectionType.wdAllowOnlyReading);

In the same i want to do this work for Excel.But i couldn't able to protect Excel file on that way.

string path = "C:\\test-wb.xlsx";
 axFramerControl1.Open(path, true,"excel.sheet", "", "");
 Microsoft.Office.Interop.Excel._Workbook excelDoc   =(Microsoft.Office.Interop.Excel._Workbook)axFramerControl1.ActiveDocument;
        Microsoft.Office.Interop.Excel.Application excelApp =excelDoc.Application;
//What code should i write to protect Excel Workbook with read - only.
       excelDoc.Protect(misval, true, misval);//It is not working.

Please Enlighten me on this...

Thanks & Regards,
P.SARAVANAN