Webpage user editing and setting cookies (asp.net and c#)

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C#

ASP.NET

As you can see, the web page gets a cookie named "asdf" and puts the string value in textbox1. I then parsed the string to take out the "asdf=" and place the parsed string in textbox2.

I want the web page user to be able to edit the string in textbox2, and have that saved as the cookie but this isn't working using the SetCookie procedure.

Thanks in advance.

Here is the c# source code:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Text.RegularExpressions;

namespace WebApplication23
{
    public partial class _Default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            string cookieString = GetCookie("asdf");
            TextBox2.Text = cookieString;
            TextBox3.Text = "";
            parseData(cookieString, "asdf=", TextBox3);
        }
        //-------------------------------------------------------------
        private void parseData(string cookieString, string pattern, TextBox txt)
        {
            int b = 0;
            int c;
            string[] substrings = Regex.Split(cookieString, pattern);
            foreach (string match in substrings)
            {
                if (substrings[b] != "")
                {
                    substrings[b] += "";// +Environment.NewLine;
                    }
                b++;
            }
            for (c = 0; c < b; c++)
            {
                TextBox3.Text+=substrings[c];
            }
        }
        //-------------------------------------------------------------
        protected void Button2_Click(object sender, EventArgs e)
        {
            TextBox2.Text = "";
            TextBox2.Text=GetCookie("asdf");
        }
        //-------------------------------------------------------------
        public string GetCookie(string cookiename)
        {
            string cookyval = "";
            try
            {
                cookyval = Request.Cookies[cookiename].Value;
                //cookyval = Request.Cookies[cookiename].Name;
            }
            catch (Exception e)
            {
                cookyval = "";
            }
            return cookyval;
        }
        //-------------------------------------------------------------
        protected void Button1_Click(object sender, EventArgs e)
        {
            SetCookie("asdf", TextBox3.Text, 1);
        }
        //-------------------------------------------------------------      
        
        
        
        
        //-------------------------------------------------------------
        public bool SetCookie(string cookiename, string cookievalue, int iDaysToExpire)
        {
            try
            {
                HttpCookie objCookie = new HttpCookie(cookiename);
                Response.Cookies.Clear();
                Response.Cookies.Add(objCookie);
                objCookie.Values.Add(cookiename, cookievalue);
                DateTime dtExpiry = DateTime.Now.AddDays(iDaysToExpire);
                Response.Cookies[cookiename].Expires = dtExpiry;
            }
            catch (Exception e)
            {
                return false;
            }
            return true;
        }

        protected void TextBox3_TextChanged(object sender, EventArgs e)
        {
            SetCookie("asdf", TextBox3.Text, 1);
        }
    }
}