how to bind observeablecollection to image

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C#

WPF

Hi experts, In my application i have a ado.net data entity model class which with it i pull data from my database,my window class code is as below:

ms = new MSEntities();
         var Res = from St in ms.Staffs
                   select St;

       ObservableCollection<Staff> staffs = new ObservableCollection<Staff>(Res); // staff is my database table

        staffName.ItemsSource = staffs; // my combo box source
        staffName.DisplayMemberPath = "StaffName";
        myimage.Source = ???

here I want to bind staffphoto to my image source but i dont know how to do that,could someone help me with this please??thank you.