C# -Excel interoperability

Question

I want to call Excel Sheet from C# 4.0 (VS 2010 Express Edition) .

When i declare ,

Microsoft.Office.Interop.Excel.ApplicationClass excel =
    new Microsoft.Office.Interop.Excel.ApplicationClass();

excel.Visible = true;

I receive error as

Interop type 'Microsoft.Office.Interop.Excel.ApplicationClass' cannot be embedded. Use the applicable interface instead.

What is the soultion ?

Answer 1

Here is a blog post that deals with that. Looks like you need to change

Microsoft.Office.Interop.Excel.ApplicationClass();

to

Microsoft.Office.Interop.Excel.Application();

Answer 2

The answer for me was to mark Embed Interop types as false. See this question.

Answer 3

Solved:

Excel.ApplicationClass derives from Excel.Application interface and one can even instantiate Excel using Excel.Application interface. Rewriting this code as below produces exact same results:

Excel.Application xlapp = new Excel.Application();

Answer 4

You need to declare the variable as Microsoft.Office.Interop.Excel.Application, but instantiate it as Microsoft.Office.Interop.Excel.ApplicationClass.