using COMAdmin; -- get this in interop.comadmin in com reference
COMAdminCatalog objCat = null;
COMAdmin.COMAdminCatalogCollection objCatColl = null;
public void ComConnection()
{
objCat= new COMAdminCatalog();
objCat.Connect("Server IP"); //give server Ip
objCatColl = (COMAdmin.COMAdminCatalogCollection)objCat.GetCollection("Applications");
}