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What is the output of below C# code?

string str = null;
str = Convert.ToString(str);
MessageBox.Show(str);

 Posted by vishalneeraj-24503 on 12/20/2013 | Category: C# Interview questions | Views: 3745 | Points: 40
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Select from following answers:
  1. Null
  2. ""
  3. Compile-Time error
  4. Run-Time error
  5. All Above

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