# 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);
}
}