Can you compare String.IsNullOrEmpty vs String.IsNullOrWhiteSpace ? ( .Net Interview questions with answers)

String.IsNullOrEmpty is used to check whether the string is null or empty.
Its equivalent to following code,
bool result=(stringVariable==null || stringVariable==string.Empty)

Let’s check what output we get with this function
      1)  String s1=null;
           String.IsNullOrEmpty(s1) true
     2)  String s2= “”;
     3)  String s3= “Sukesh Marla”;
     4)  String s4= “ “;

Now let’s talk about string. IsNullOrWhiteSpace method. In simple words IsNullOrWhiteSpace= IsNullOrEmpty+CheckWhetherStringContainOnlyWhiteSpaces.

Let’s check what output we get with this function
      1)  String s1=null;

           String.IsNullOrWhiteSpace (s1)true
      2)  String s2= “”;
           String.IsNullOrWhiteSpace (s2)true
      3)  String s3= “Sukesh Marla”;
           String.IsNullOrWhiteSpace (s3)false
      4)  String s4= “ “;
           String.IsNullOrWhiteSpace (s1)true

Hope you enjoyed reading this one. To learn more such small things which are important from interview perspective subscribe to questpond.

You can also watch the below wonderful video from which answers one more most asked .NET interview question ( String vs StringBuffer )


About c# and .NET Interview questions

This blog is for developers who want to crack .NET and C# interviews. It has all tips and tricks needed to crack .NET interviews , C# interview , SQL Server interview , Java interview , WCF Interview , Silverlight interview , WPF interview , LINQ interview , Entity framework Interview. Do not forget to watch our Learn step by step video series. Learn MVC in 16 hours:- Learn AngularJS Step by Step:- Learn Design Pattern in 8 hours:- Learn C# and .NET in 60 days:- Learn MSBI in 32 hours:- Learn SharePoint Step by Step in 8 hours:-
This entry was posted in Uncategorized and tagged , , , , , , . Bookmark the permalink.

Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )


Connecting to %s