MS Office Version in C#.Net

"MS Office Version in C#.Net" 

public static string GetOfficeVer()
{
string sVersion = string.Empty;
Microsoft.Office.Interop.Excel.Application appVersion = new Microsoft.Office.Interop.Excel.Application();
appVersion.Visible = false;
switch (appVersion.Version.ToString())
{
case "7.0":
sVersion = "95";
break;
case "8.0":
sVersion = "97";
break;
case "9.0":
sVersion = "2000";
break;
case "10.0":
sVersion = "2002";
break;
case "11.0":
sVersion = "2003";
break;
case "12.0":
sVersion = "2007";
break;
case "14.0":
sVersion = "2010";
break;
default:
sVersion = "Too Old!";
break;
}
return sVersion;
}