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Compiler Error CS0036 

Error Message

An out parameter cannot have the '[In]' attribute

Currently, the In attribute is not permitted on an out parameter.

The following sample generates CS0036:

// CS0036.cs

using System;
using System.Runtime.InteropServices;

public class MyClass
   public static void TestOut([In] out char TestChar)   // CS0036
   // try the following line instead
   // public static void TestOut(out char TestChar)
      TestChar = 'b';

   public static void Main()
      char i;           //variable to receive the value
      TestOut(out i);   // the arg must be passed as out
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