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Compiler Warning (level 3) CS0675 

Error Message

Bitwise-or operator used on a sign-extended operand; consider casting to a smaller unsigned type first

The compiler implicitly widened and sign-extended a variable, and then used the resulting value in a bitwise OR operation. This can result in unexpected behavior.

The following sample generates CS0675:

// CS0675.cs
// compile with: /W:3
using System;

public class sign
   public static void Main()
      int hi = 1;
      int lo = 1;
      long value = (((long)hi) << 32) | lo;              // CS0675
      // try the following line instead
      // long value = (((long)hi) << 32) | ((uint)lo);   // correct