Open an Excel Addin in C# -


i inherited c# windows application builds big spreadsheet display user. enhancement add existing excel add-in spreadsheet. have been trying add add-in once spreadsheet has been completed in code this:

            excelapp.visible = true;             // trying add add-in             string workbookpath = @"c:\addiniwasgiven.xls";             workbook excelworkbook = excelapp.workbooks.open(workbookpath, 0, false, 5, "", "", false, xlplatform.xlwindows, "", true, false, 0, true, false, false);

whenever this, error: "cannot open microsoft excel add-in editing. please edit source document instead". unsure why getting error. see excelworkbook comes "c:\addiniwasgiven.xls", read how debugger showing it. i'm new add-ins , c#. suggestions or appreciated.

with , trial , error, found worked:

string workbookpath = @"c:\addin.xla"; workbook excelworkbook = excelapp.workbooks.open(workbookpath, 0, false, 5, "", "", false, xlplatform.xlwindows, "", false, false, 0, true, false, false);

add-in files should have .xla or .xlam extension. set workbook.isaddin=true saving .xls file excel add-in .xlam


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