Make CheckBox ReadOnly in ASP.NET

using System;
using System.Collections.Generic;
using System.Data;
using System.Data.SqlClient;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Configuration;

public partial class AttributesProperty: System.Web.UI.Page {
    SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["constring"].ConnectionString);
    protected void Page_Load(object sender, EventArgs e) {
        if (!IsPostBack == true) {
            BindData();
        }
    }
    protected void BindData() {
        try {
            string strQuery = "select ID, Attributes, Properties from tblAttributes";
            SqlCommand cmd = new SqlCommand(strQuery, con);
            cmd.CommandType = CommandType.Text;
            SqlDataAdapter da = new SqlDataAdapter(cmd);
            DataTable dt = new DataTable();
            da.Fill(dt);
            AttributeGrid.DataSource = dt;
            AttributeGrid.DataBind();
        } catch (Exception ex) {
            //throw ex;
        } finally {
            con.Close();
        }

    }
    protected void checkProperties_CheckedChanged(object sender, EventArgs e) {
        CheckBox check = (CheckBox) AttributeGrid.FindControl("checkAttributes");
        GridViewRow GrdRW = (GridViewRow) check.Parent.Parent;
        Response.Write(AttributeGrid.DataKeys[GrdRW.RowIndex].Value.ToString());
        if (check.Checked == true) {}
    }
    protected void AttributeGrid_RowDataBound(object sender, GridViewRowEventArgs e) {
        //

        {

            if (e.Row.RowType == DataControlRowType.DataRow) {
                //Label a = (Label)DataBinder.Eval(e.Row.DataItem, "lblDept1");
                var a = (Label) e.Row.FindControl("lblDept1");
                string b = a.Text;
                if (b == "0") {
                    ((CheckBox) e.Row.FindControl("checkProperties")).Checked = true;
                } else if (b == "1") {
                    ((CheckBox) e.Row.FindControl("checkProperties")).Checked = false;
                } else Response.Write("inavlid entry");

            }

        }
    }
}