Sync Framework DbProvisioningException

Im trying to learn Sync framework. I have followed step by step MSDN Documentation and it didn't work. Surprised?! What i need is to sync a SQL Express Database with SQL Express Database. While reading about provisioning and other prepare i need to do, i could never find if this must be run every time i want to use sync. I mean, provision -> sync -> deprovision. Another thing is that is that i get this strange exception while making step by step the MSDN sample.

DbProvisioningException "MomScope" already exists...shoudn't be exist?

Code:

private void InitializeSync()
{
    SqlConnection sourceConn = new SqlConnection(ConfigManager.Config.SourceSyncConnectionString);
    SqlConnection myConn = new SqlConnection(ConfigManager.Config.ConnectionString);

    #region SET SOURCE PROVIDER

    SqlSyncProvider sourceSqlProv = new SqlSyncProvider("MomSync", sourceConn);

    DbSyncScopeDescription sourceScope = new DbSyncScopeDescription("MomScope");

    DbSyncTableDescription productsSourceTableDesc = SqlSyncDescriptionBuilder.GetDescriptionForTable("Mom_Products", sourceConn);
    DbSyncTableDescription customersSourceTableDesc = SqlSyncDescriptionBuilder.GetDescriptionForTable("Mom_Customer", sourceConn);
    DbSyncTableDescription ordersSourceTableDesc = SqlSyncDescriptionBuilder.GetDescriptionForTable("Mom_Orders", sourceConn);
    DbSyncTableDescription paymentsSourceTableDesc = SqlSyncDescriptionBuilder.GetDescriptionForTable("Mom_Payments", sourceConn);

    sourceScope.Tables.Add(productsSourceTableDesc);
    sourceScope.Tables.Add(customersSourceTableDesc);
    sourceScope.Tables.Add(ordersSourceTableDesc);
    sourceScope.Tables.Add(paymentsSourceTableDesc);

    SqlSyncScopeProvisioning sourceProvision = new SqlSyncScopeProvisioning(sourceConn, sourceScope);
    sourceProvision.SetCreateTableDefault(DbSyncCreationOption.Skip);

    try
    {
        sourceProvision.Apply();
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message);
    }

    #endregion

    #region SET MY PROVIDER

    SqlSyncProvider myProvider = new SqlSyncProvider("MomSync", myConn);

    DbSyncScopeDescription scopeSourceDesc = SqlSyncDescriptionBuilder.GetDescriptionForScope("MomScope", sourceConn); <===== DbProvisioningException (MomScope already exists????)
    SqlSyncScopeProvisioning myProvision = new SqlSyncScopeProvisioning(myConn, scopeSourceDesc);

    try
    {
        myProvision.Apply();
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message);
    }

    #endregion

    #region SET SYNC ORCHESTRATOR

    OrcheStrator = new SyncOrchestrator
                       {
                           LocalProvider = myProvider,
                           RemoteProvider = sourceSqlProv,
                           Direction = SyncDirectionOrder.UploadAndDownload
                       };

    ((SqlSyncProvider)OrcheStrator.LocalProvider).ApplyChangeFailed += ApplyChangeFailedHandler;

    #endregion
}

Any proper sync samples? So i can figure properly how to create this task?

Thank you.

Should anyone still be interested...

Just implement a check on sourceProvision.Exists() right before you apply() http://msdn.microsoft.com/en-us/library/dd919024.aspx