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Compiler Error CS0579

Duplicate 'attribute' attribute

It is not possible to specify the same attribute more than once unless the attribute specifies AllowMultiple=true in its AttributeUsage.

// CS0579.cs
using System;
public class MyAttribute : Attribute
{
}

[AttributeUsage(AttributeTargets.All,AllowMultiple=true)]
public class MyAttribute2 : Attribute
{
}

public class z
{
   [MyAttribute, MyAttribute]     // CS0579
   public void zz()
   {
   }

   [MyAttribute2, MyAttribute2]   // OK
   public void zzz()
   {
   }

   public static void Main()
   {
   }
}
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