Try something like this. Replace ImageBlobMember with your XAML control x: Name / Name and replace Image.SourceProperty with the appropriate value, depending on the type of control.
BindingExpression bindExp =
ImageBlobMember.GetBindingExpression(System.Windows.Controls.Image.SourceProperty);
Binding bind = bindExp.ParentBinding;
ImageBlobMember.SetBinding(System.Windows.Controls.Image.SourceProperty, bind);
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