IDataErrorInfo Interface in WPF 

Hi Your videos are very useful and Thanks very much for contribution to the WPF learner. Please can you add some video for Prism.Thanks in advance

Thanks, So how did it show the "Last Name is required" where as you are checking isNullOrEmplty for Fname , and with "Virat" already populated in the Fname Textbox, it shouldn't have shown the Validation right?... please help to clear the doubt...

Thanks.

error messages or red border shouldn't be on load event, how to apply that on textbox keydown or other key event, without having these event to apply on every txt controls(it will slowdown)

How can we achieve validation on button click,not before button click.

nice explanation, there is a slight mistake case LName ur checking FName is null or empty

Which video editing tool u r using?