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Compiler Error CS0104

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'reference' is an ambiguous reference between 'identifier' and 'identifier'

Your program contains using directives for two namespaces and your code references a name that appears in both namespaces.

The following sample generates CS0104:

// CS0104.cs
using x;
using y;

namespace x
{
   public class Test
   {
   }
}

namespace y
{
   public class Test
   {
   }
}

public class a
{
   public static void Main()
   {
      Test test = new Test();   // CS0104, is Test in x or y namespace?
      // try the following line instead
      // y.Test test = new y.Test();
   }
}