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!

Code:
 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:...