Hi

            Server myServer = new Server(@".\SQLEXPRESS");

            myServer.ConnectionContext.LoginSecure = true;
            myServer.ConnectionContext.Connect();

            Scripter scripter = new Scripter(myServer);
            Microsoft.SqlServer.Management.Smo.Database mydatabase = myServer.Databases[databasename];
            Urn[] mydatabaseurn = new Urn[] { mydatabase.Urn };
            StringCollection scriptcollection = scripter.Script(mydatabaseurn);

            foreach (string script in scriptcollection)
            {
                MessageBox.Show(script);
            }

Error Is Comming-          Script failed for Database 'databasename'.