[C#] ADF.LY Mass Link Generator

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

namespace URLShrinkPlatinum
{
    public partial class Form1 : Form
    {

        string convert = "Status: Conversion Complete!";
        string save = "Status: Save Complete!";
        string apploaded = "Status: App Loaded!";
        string copyrights = " - Developed by Vick@Dexozoft.com";
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            // Declare, and set WebClient Vars, txtStatus.text
            txtStatus.Enabled = false;
            txtStatus.Text = apploaded + copyrights;
            // AutoLoad raw urls..
            this.lbRaw.Items.Clear();
            try
            {
                StreamReader LoadURL = new StreamReader(Convert.ToString("rawURL.txt"));
                while (LoadURL.Peek() >= 0)
                    lbRaw.Items.Add(Convert.ToString(LoadURL.ReadLine()));
            }
            catch (Exception ex)
            {
                MessageBox.Show(Convert.ToString(ex.Message));
                return;
            }
        }

        private void btnExit_Click(object sender, EventArgs e)
        {
            // easy said, easy done..
            this.Close();
        }

        private void btnConvert_Click(object sender, EventArgs e)
        {
            // Disable this.button, so users know its converting..if there smart..
            this.btnConvert.Enabled = false;

            // Loop for each item in listbox and convert..
            for (int i = 0; i < this.lbRaw.Items.Count; i++)
            {
                // get count of items
                this.lbRaw.SetSelected(i, false);
                // webclient declaration
                System.Net.WebClient newClient = new System.Net.WebClient();
                // string to hold url retreieved.. <wrong spellin lawl..
                string apikey = "901f3bb31fd2638fd14ee0a6d216263a"; // replace with your api key found in adf.ly api docs
                string uid = "511563"; //replace with your user id found in adf.ly api docs
                string newURL = newClient.DownloadString("http://api.adf.ly/api.php?key=" + apikey + "&uid=" + uid + "&advert_type=int&domain=adf.ly&url=" + this.lbRaw.Items[i]);
                // add new urls to 2nd listbox..
                this.lbNew.Items.Add(newURL.ToString());
            }
            // re-enable button, convert
            this.btnConvert.Enabled = true;
            // set status update..
            txtStatus.Text = "Status: Converted! " + copyrights;
        }

        private void btnSave_Click(object sender, EventArgs e)
        {
            // save to file..
            StreamWriter Write;
            try
            {
                Write = new StreamWriter("newURL.txt");
                for (int a = 0; a < this.lbNew.Items.Count; a++)
                {
                    Write.WriteLine(Convert.ToString(lbNew.Items[a]));
                }
                Write.Close();
            }
            catch (Exception ex)
            {
                MessageBox.Show(Convert.ToString(ex.Message));
                return;
            }
            txtStatus.Text = "Status: Saved! " + copyrights;
        }
    }
}