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Compiler Error CS0439

Visual Studio 2008

An extern alias declaration must precede all other elements defined in the namespace

This error occurs when an extern declaration comes after something else, such as a using declaration, in the same namespace. The extern declarations must come before all other namespace elements.

The following example generates CS0439:

Copy 
// CS0439.cs
using System;

extern alias MyType;   // CS0439
// To resolve the error, make the extern alias the first line in the file.

public class Test 
{
    public static void Main() 
    {
    }
}
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