Close all open forms except the main menu in C#

Question

Trying to close all forms except for the main menu using

FormCollection formsList = Application.OpenForms;

with a foreach loop and saying,

Answer 1

To Close all forms :

        for (int i = Application.OpenForms.Count - 1; i >= 0; i--)
        {
            if (Application.OpenForms[i].Name != "Menu")
                Application.OpenForms[i].Close();
        }