How to check object is null or empty in C#.NET 3.5?

Question

If objects contains null or empty then how to validate or check the condition for the same?

How to bool check whether object obj is null or

Answer 1

You shouldn't be a bit surprised that you get a NullReferenceException with this code. The offending part is

obj.ToString()

If you wrote

object obj = null;
string s = obj.ToString();

you would expect a NullReferenceException. Since the call to ToString occurs before the call to string.IsNullOrEmpty, the exception is thrown before there is a check for a null or empty string.