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How to Check whether a String is Null or Empty in .NET
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If you have a string variable in your program and you want to check whether it is empty or null you have following options:
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string a = null;
string b = "";
To check whether string is null you can use = = operator
Console.WriteLine(a == null);
To Check whether string is empty you can either use = = operator by comparing it with String.Empty property or you can use Equals() method of string class as shown below:
Console.WriteLine(b.Equals(""));
Console.WriteLine(b == String.Empty);
To check both null and empty in one statement you can use IsNullOrEmpty method of string class
Console.WriteLine(String.IsNullOrEmpty(a));
Console.WriteLine(String.IsNullOrEmpty(b));
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