Try to open my Excel file using C# and get an error

Question

I try to read my Exel file from code and received System.InvalidCastException:

Additional information: Unable to cast COM object of type \'System.__Co

Answer 1

Seems like you are using

    Microsoft.Office.Tools.Excel.Worksheet 

instead of

    Microsoft.Office.Interop.Excel.Worksheet

which is why you are getting an invalid cast exception.