MVVM - implementing 'IsDirty' functionality to a ModelView in order to save data

Question

Being new to WPF & MVVM I struggling with some basic functionality.

Let me first explain what I am after, and then attach some example code...

I have a scree

Answer 1

This is how I have implemented IsDirty. Create a wrapper for every property of User class (inheriting User class with IPropertyChanged and implementing onpropertychanged in User class wont help) in your ViewModal. You need to change your binding from UserName to WrapUserName.

public string WrapUserName 
    {
        get
        {
            return User.UserName          
        }
        set
        {
            User.UserName = value;
            OnPropertyChanged("WrapUserName");
        }
    }

Now have a property

 public bool isPageDirty
    {
        get;
        set;
    }     

Since your viewmodal inherits from baseviewmodal and baseviewmodal implements onPropertyChanged.

UserViewModel.PropertyChanged += (s, e) => { isPageDirty = true; };    

In case any of the propertychanges,isPageDirty will be true, So while saving you chan check isPageDirty.