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What are the ways to check if string has no values defined in it?

 Posted by Vishalneeraj-24503 on 5/16/2015 | Category: Visual Studio Interview questions | Views: 1529 | Points: 40
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Select from following answers:
  1. if (string_variable != null || string_variable != "") { }
  2. if (string_variable != null || string_variable != string.Empty) { }
  3. if(string.IsNullOrEmpty(string_variable)) { }
  4. All of the above.
  5. All Above

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