strDBServerName = "."
strDBName = "MyDatabase"

Set objSQLServer = CreateObject("SQLDMO.SQLServer")
objSQLServer.LoginSecure = True
objSQLServer.Connect strDBServerName

Set objDB = objSQLServer.Databases(strDBName)
WScript.Echo "Total Size of Data File + Transaction Log of DB " & strDBName & ": " & objDB.Size & "(MB)"