What is the difference between (“”) and (null)

Question

While trying to set Validations i initially encountered some problems with checking if a textbox is null, i tried using

    private void btnGo_Click(object s         


        

Answer 1

You can use IsNullOrWhiteSpace to do text box input validation. It checks for null, empty string or white space (tab, space, etc.). http://msdn.microsoft.com/en-us/library/system.string.isnullorwhitespace.aspx