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copied!<p>Based on my understanding, the states you have to provide is a dynamic immutable list of options where you want to prompt user to enable/disable each of them, then return result as original string. </p> <p>If the list is a static list that you expect, for instance states, I'd surely suggest you having a list of states, and mapping against it.</p> <p>Make an Tag class that implement INotifyPropertyChanged, that has two props (name, selected) and remember to raise the <code>PropertyChanged</code> for each property change (I see it's excluded from your code, I assume for brevity purposes).</p> <p>Make a List subclass, add a string constructor and override the ToString(), make all the parsing in this class and return the result on the ToString, then call it from you ViewModel.</p> <p>I now realize that you tagged the question with <a href="https://stackoverflow.com/questions/tagged/ria" title="ria"><img src="https://i.stack.imgur.com/PX220.png" alt="RIA"></a>, so why would you want to bind against that comma delimited string?</p> <p>You might want to expose the options in the server and treat it like this, so the client doesn't know it's a comma delimited.</p> <pre><code>public class OptionsViewModel : ViewModelBase { public OptionsViewModel() { IsBusy = True; var context = new MyDomainContext(); _Tags = context.Tags; //if called elsewhere but from ctor, make sure context.IsLoading is false; //The Load method is throwing an exception if re-loading when a load is on. //Debug.Assert(!context.IsLoading); context.Load( context.GetTagsQuery(), (op) => { if(op.HasError && !op.IsErrorHandled) op.MarkErrorAsHandlere(); IsBusy = false; }, null); } private readonly Ienumerable<Tag> _Tags; public Ienumerable<Tag> Tags { get { return _Tags; } } } </code></pre> <p>In the server expose an operation that returns that datacontract (of Tag) and the server should do the comma string parsing.</p>

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