ModelDifferenceDbStore - Make it easier to store user settings in the database for WinForms and Web applications separately

The IModelDifference interface now declares the ContextID property.

ContextId is the context identifier of the current Model Difference that allows distinguishing Model Differences designed for different applications using the same database. For example, you can use the "Win" identifier for the WinForms application and "Web" - for ASP.NET in order to store WinForms and ASP.NET model differences separately. You can pass the contextId parameter to the ModelDifferenceDbStore constructor to specify the current context when setting up the database storage for model differences:

C#
public sealed partial class MySolutionWindowsFormsModule : ModuleBase {  
    private void Application_CreateCustomModelDifferenceStore(Object sender, CreateCustomModelDifferenceStoreEventArgs e) {  
        e.Store = new ModelDifferenceDbStore((XafApplication)sender, typeof(ModelDifference), true, "Win");  
        e.Handled = true;  
    }  
    private void Application_CreateCustomUserModelDifferenceStore(Object sender, CreateCustomModelDifferenceStoreEventArgs e) {  
        e.Store = new ModelDifferenceDbStore((XafApplication)sender, typeof(ModelDifference), false, "Win");  
        e.Handled = true;  
    }  
    //...  
    public override void Setup(XafApplication application) {  
        base.Setup(application);  
        application.CreateCustomModelDifferenceStore += Application_CreateCustomModelDifferenceStore;  
        application.CreateCustomUserModelDifferenceStore += Application_CreateCustomUserModelDifferenceStore;  
    }  
}