Using UserControl in Windows Forms Application using C#

Add User Defined Control [Button] .Add property 'security Level' 

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace PMS_Pro_Win.Custom_Controls
{
    public partial class btn : System.Windows.Forms.Button
    {
        public btn()
        {
            InitializeComponent();
        }

        protected override void OnPaint(PaintEventArgs e)
        {
            base.OnPaint(e);
            
            if (SecurityLevel > 0)
            {
                base.Enabled = false;
            }
            else
            {
                base.Enabled = true;
            }
        }

        private int level;
        [Category("Security Level"), Description("Enter Security Level")]

        public int SecurityLevel
        {
            get
            {
                return level;
            }
            set
            {
                level = value;
                Invalidate();
            }
        }
    }
}

How to set property give by varibale name which is declare in another Class file