Const string inside function - C ＃

Mricrosoft XNA Excerpts from the education catalogue ：

    /// <summary>    /// Draws the control, using SpriteBatch and SpriteFont.    /// </summary>    protected override void Draw()    {        const string message = "Hello, World!\n" +                               "\n" +                               "I'm an XNA Framework GraphicsDevice,\n" +                               "running inside a WinForms application.\n" +                               "\n" +                               "This text is drawn using SpriteBatch,\n" +                               "with a SpriteFont that was loaded\n" +                               "through the ContentManager.\n" +                               "\n" +                               "The pane to my right contains a\n" +                               "spinning 3D triangle.";        GraphicsDevice.Clear(Color.CornflowerBlue);        spriteBatch.Begin();        spriteBatch.DrawString(font, message, new Vector2(23, 23), Color.White);        spriteBatch.End();    }

The lottery is called per second 60 Time . Whether there is performance overhead in allocating messages in the lottery ？ Is it the same as moving it to a static helper class ？ as far as I am concerned , The cost expression is composed of C＃ Compiler evaluated . Here const What happens to modifiers ？

Reference plan

const Only evaluated once . Move it to a static variable , There will be nothing .

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