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Compiler Warning (level 3) CS0665

Assignment in conditional expression is always constant; did you mean to use == instead of = ?

A conditional expression used the = operator and not the == operator.

The following sample generates CS0665:

// CS0665.cs  
// compile with: /W:3  
class Test  
{  
   public static void Main()  
   {  
      bool i = false;  
  
      if (i = true)   // CS0665  
      // try the following line instead  
      // if (i == true)  
      {  
      }  
  
      System.Console.WriteLine(i);  
   }  
}