I have tried the code shown below to disable cut,copy and paste option in excel using c#, but still I'm able to copy and paste.
Microsoft.Office.Interop.Excel.Worksheet wks = (Microsoft.Office.Interop.Excel.Worksheet)wkb.Sheets[1];
wks.Application.CutCopyMode = (Microsoft.Office.Interop.Excel.XlCutCopyMode)0;