C# can't use variable value due to SecureString type [duplicate]

Tell me, in the program it is necessary to use the password of one of the users to start the program, but when I use the value of the variable with the password, the following error occurs: cannot convert from string to System.Secure.Security.SecureString; the value must be obtained from the variable, and not entered from the keyboard.

using System;
using System.ComponentModel;
using System.Diagnostics;
using System.Security;

public class Example
{
    public static void Main()
    {
        string password = "password";

        try
        {
            Process.Start("Notepad.exe", "MyUser", password, "MYDOMAIN");
        }
        catch (Win32Exception e)
        {
            Console.WriteLine(e.Message);
        }

    }
}