IValueConverter is simple interface to convert one type of value into another type and we can apply logic in databinding. As if we need to show/hide a control but we've bool value to bind in xaml so we can convert bool value to visiblity type. How to implement IValueConverter https://msdn.microsoft.com/en-us/library/system.windows.data.ivalueconverter(v=vs.110).aspx