An attempt to reference an uninitialized variable

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/*
Mastering Visual C# .NET
by Jason Price, Mike Gunderloy

Publisher: Sybex;
ISBN: 0782129110
*/
/*
  Example2_4.cs shows an attempt to reference an
  uninitialized variable
*/

public class Example2_4
{

  public static void Main()
  {

    int myValue;
    System.Console.WriteLine(myValue);  // causes an error

  }

}