static void Main()
{
string path = @"C:\My Documents\My Projects\Test\Excel\App_Data\W.xlsm";
var excel = (Application)Marshal.GetActiveObject("Excel.Application");
excel.Visible = false;
Workbook workbook = excel.Workbooks.Open(path, Missing.Value, false, Missing.Value, Missing.Value, Missing.Value, true, Missing.Value, Missing.Value, true, Missing.Value, Missing.Value, Missing.Value);
workbook.RefreshAll();
workbook.Worksheets["Legal Obligation Register"].Range("E11", "W171").Cells.Borders.Color = ColorTranslator.ToOle(Color.Black);
workbook.Worksheets["Tools"].Range("A6", "F581").Cells.Borders.Color = ColorTranslator.ToOle(Color.Black);
workbook.Save();
workbook.Close(true);
excel.Quit();
}