I have opened Excel file in my C# WinForm Application adding reference to Microsoft.Office.Interop.Excel.dll

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Asked: May 28, 20262026-05-28T15:05:47+00:00 2026-05-28T15:05:47+00:00

I have opened Excel file in my C# WinForm Application adding reference to Microsoft.Office.Interop.Excel.dll

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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.