How do i create a Excel file?

[dbncourt]

Using c#, i want to create a Excel file in a given path and name. So far i found this, that could work but it doesnt!

 oWB.SaveAs(filePath, ".xls", Missing.Value, Missing.Value , Missing.Value , Missing.Value, Excel.XlSaveAsAccessMode.xlShared, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value);

and the same but insted of the filePath, the fileName. In both cases i get this error:

Non controled exception 'System.Runtime.InteropServices.COMException' en Tesis.exe'. HRESULT Exception: 0x800A03EC

Any ideas?¿

I found another solution with a conection string and stuff, but i cant find my connection stirng anywhere on the internet :/