remember password cookie in asp.net c

protected void CheckBox1_CheckedChanged(object sender, EventArgs e)
    {
        HttpCookie ck = new HttpCookie(TextBox1.Text, TextBox2.Text);
        ck.Expires = System.DateTime.Now.AddDays(2);
        Response.Cookies.Add(ck);

    }


    protected void TextBox1_TextChanged(object sender, EventArgs e)
    {
        foreach (string str in Request.Cookies)
        {
            if (Request.Cookies[str].Name == TextBox1.Text)
            {
                //TextBox2.Text = Request.Cookies[str].Value;
                TextBox2.Attributes.Add("value", Request.Cookies[str].Value);
            }

        }
    }