How to open Excel file with Read Only protection?

Question

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 successfully done this for WORD Application like this

Word.Document wordDoc = (Word.Document)axFramerControl1.ActiveDocument;
Word.Application wordApp = wordDoc.Application;
wordDoc.Protect(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", "", "");

Excel._Workbook excelDoc   =(Microsoft.Office.Interop.Excel._Workbook)axFramerControl1.ActiveDocument;
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.

Solution

Call theOpen method with third parameter (ReadOnly) = true.

See MSDN documentation :

ReadOnly
Optional Object. True to open the workbook in read-only mode.

Comments

[Saravanan]

:Thanks gdoron.Can you please tell where should i give that parameter in my above code that i mentioned in my question?

[gdoron is supporting Monica]

@Saravanan. According to the MSDN, you should open with third param true. which .Net framework do you use? .Net 4?

[Lukas]

This helped me. Instead however I just added the password as the 6th parameter of the Open method.