How reset the Existing enum type values

[Mutant_Fruit]

If you want an enum with all the values equal to each other, then the enum is useless.

enum Shapes {
    Line = 0,
    Circle = 0
}

public void Method ()
{
    Shapes shape = Shapes.Line;
    if (shape == Shapes.Circle)
       throw new WtfException ();
}

That code will throw a WtfException. Is this what you really want? If so, then you don't want an enum.