You can, relativly, use late-binding IDispatch binding in C#.
http://support.microsoft.com/kb/302902
Here’s some sample for using Excel. This way you don’t need to add a needless dependancy on Microsoft’s bloaty PIA:
//Create XL
Object xl = Activator.CreateInstance(Type.GetTypeFromProgID("Excel.Application"));
//Get the workbooks collection.
// books = xl.Workbooks;
Object books = xl.GetType().InvokeMember( "Workbooks",
BindingFlags.GetProperty, null, xl, null);
//Add a new workbook.
// book = books.Add();
Objet book = books.GetType().InvokeMember( "Add",
BindingFlags.InvokeMethod, null, books, null );
//Get the worksheets collection.
// sheets = book.Worksheets;
Object sheets = book.GetType().InvokeMember( "Worksheets",
BindingFlags.GetProperty, null, book, null );
Object[] parameters;
//Get the first worksheet.
// sheet = sheets.Item[1]
parameters = new Object[1];
parameters[0] = 1;
Object sheet = sheets.GetType().InvokeMember( "Item",
BindingFlags.GetProperty, null, sheets, parameters );
//Get a range object that contains cell A1.
// range = sheet.Range["A1];
parameters = new Object[2];
parameters[0] = "A1";
parameters[1] = Missing.Value;
Object range = sheet.GetType().InvokeMember( "Range",
BindingFlags.GetProperty, null, sheet, parameters );
//Write "Hello, World!" in cell A1.
// range.Value = "Hello, World!";
parameters = new Object[1];
parameters[0] = "Hello, World!";
objRange_Late.GetType().InvokeMember( "Value", BindingFlags.SetProperty,
null, range, parameters );
//Return control of Excel to the user.
// xl.Visible = true;
// xl.UserControl = true;
parameters = new Object[1];
parameters[0] = true;
xl.GetType().InvokeMember( "Visible", BindingFlags.SetProperty,
null, xl, Parameters );
xl.GetType().InvokeMember( "UserControl", BindingFlags.SetProperty,
null, xl, Parameters );