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However when I add this method to my Relay Command implementation I get the error: "The event Can Execute Changed can only appear on the left hand side of = or -=".

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You can force the refresh in the View Model with this function: You don’t need to know about LANDesk or know what an LDPing is to understand what is going on enough to see how to use this one function. Here is the code: /// This is the Ping method that launches an LDPing as a Background Worker process, using /// Ping Worker which is an object that inherits Background Worker and adds one property called /// Ping Succeeded.

Invalidate Requery Suggested and i tried to use their some times but i don't know how to do it properly and it didn't take an effect. Set it to true whenever you change any field (add logic to the setters for properties to do this) and have your save command check the isdirty, run validation and then submit if all conditions are met.

If you want to get really fancy, look into using the IObservable interface. I don't know how you have set the "Data Context" of your view to your view model, but assuming that is all correct and no issue, adjust the textbox and command button to something like Notice the text binding is to the "Entity" object on your MVVM and then the ". The important thing here is the Update Source Trigger.

Can Execute Select Case methodname Case "Address" Return Try Cast(method, Model View. Execute Select Case methodname Case "Address" Try Cast(method, Model View. Delete Command("Address", Me) Property Selected Address As Model.

Can Delete Numbers Case Else : Return False End Select End Function Public Event Can Execute Changed(sender As Object, e As Event Args) Implements ICommand. Delete Numbers() Case Else End Select End Sub End Class Public Class Contact MV Property Contact As Model. Contact Mod Property Add Address Command As New Commands.