Image Map / Hot Spot _ Point Plotting

//default from vs
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

//for txt file manipulation
using System.IO;

public partial class _PointWindow : System.Web.UI.Page 
{
    //setup blank point list txt file setup image linkups and file info
    protected void Page_Load(object sender, EventArgs e)
    {

        String FILENAME = Server.MapPath("Points.txt");

        if(!Page.IsPostBack)
        {
            StreamWriter sr = File.CreateText(FILENAME);
            sr.Close();

            PointList.Text = null;
        }

        FILENAME = Server.MapPath("ImageActive.txt");
        StreamReader sr2 = File.OpenText(FILENAME);
        String contents = sr2.ReadToEnd();
        sr2.Close();

        char [] trim;
        trim = new char[2]; 
        trim[0]=('~');
        trim[1]=('/');
        contents.TrimStart(trim);
        //Create an image object from file
        System.Drawing.Image CurrentImage = System.Drawing.Image.FromFile(Server.MapPath(contents));

        //Determine width and height of image
        int ImageWidth = CurrentImage.Width;
        int ImageHeight = CurrentImage.Height;

        Regions.Height = CurrentImage.Height;
        Regions.Width = CurrentImage.Width;
        Regions.ImageUrl = contents;

        //load active list
        FILENAME = Server.MapPath("ListActive.txt");
        StreamReader sr3 = File.OpenText(FILENAME);
        String contents2 = sr3.ReadToEnd();
        sr3.Close();

        if (contents2 != "")
        {
            char[] trim2;
            trim2 = new char[2];
            trim2[0] = ('~');
            trim2[1] = ('/');
            contents.TrimStart(trim2);

            FILENAME = Server.MapPath(contents2);
            StreamReader sr4 = File.OpenText(FILENAME);
            String contents3 = sr4.ReadToEnd();
            sr4.Close();

            FILENAME = Server.MapPath("Points.txt");
            StreamWriter sr5 = File.CreateText(FILENAME);
            //sr5 = File.AppendAllText(FILENAME,"");
            sr5.Write(contents3);
            sr5.Close();

            PointList.Text = contents3;
        }
    }

    //read inpoints and save to generic file Points.txt
    public void RegionMap_Clicked(object sender, ImageClickEventArgs Args)
    {
        String FILENAME = Server.MapPath("Points.txt");
        StreamWriter sr = File.AppendText(FILENAME);
        sr.Write(Args.X.ToString() + "," + Args.Y.ToString() + "," );
        sr.Close();

        StreamReader sr2 = File.OpenText(FILENAME);
        String contents = sr2.ReadToEnd();
        PointList.Text = contents;
        sr2.Close();

        //--Do line drawing here--\\
        //draw all points in current list
        
        string[] arInfo = new string[200];

        // define which character is seperating fields
        char[] splitter = { ',' };

        arInfo = contents.Split(splitter);
        int count = 0;

        int[] x1 = new int[200];
        int[] y1 = new int[200];
        int[] x2 = new int[200];
        int[] y2 = new int[200];

        for (int x = 0; x > -1;)
        {
            if (count == 0)
            {
                if (arInfo[x] != "")
                {
                    x1[count] = Int32.Parse(arInfo[x]);
                    x++;
                }
                else
                { break; }
                if (arInfo[x] != "")
                {
                    y1[count] = Int32.Parse(arInfo[x]);
                    x++;
                }
                else
                { break; }
            }
            else
            {
                if (arInfo[x] != "")
                {
                    x1[count] = x2[count - 1];
                    //x++;
                }
                else
                { break; }
                if (arInfo[x] != "")
                {
                    y1[count] = y2[count - 1];
                    //x++;
                }
                else
                { break; }
            }
                if (arInfo[x] != "")
            {
                x2[count] = Int32.Parse(arInfo[x]);
                x++;
            }
            else
            { break; }
            if (arInfo[x] != "")
            {
                y2[count] = Int32.Parse(arInfo[x]);
                x++;
            }
            else
            { break; }
            
            count++;
        }

        string jScript;
        jScript = "<script> var linecanvas_graphics = new Graphics('linecanvas');";
        int index = 0;
        if(count > 0)
        {            for (;count != -1; count-- )
            {

                jScript += "linecanvas_graphics.drawLine(" + x1[index] + "," + y1[index] + "," + x2[index] + "," + y2[index] + "); ";
                index++;
            }
        }
        jScript += "linecanvas_graphics.paint(); </script>";
        Page.RegisterClientScriptBlock("keyClientBlock", jScript);


    }

    //erase points.txt
    protected void ClearPointList_Click(object sender, EventArgs e)
    {
        String FILENAME = Server.MapPath("Points.txt");
        StreamWriter sr = File.CreateText(FILENAME);
        sr.Close();

        FILENAME = Server.MapPath("ListActive.txt");
        StreamWriter sr1 = File.CreateText(FILENAME);
        sr1.Close();

        PointList.Text = null;

    }

    //save points.txt data in user defined file
    protected void SavePointList_Click(object sender, EventArgs e)
    {
        if (PointListDisplay.Text != "")
        {
            //Point_Lists
            String FILENAME = Server.MapPath("~/PointLists/" + PointListDisplay.Text + ".txt");
            StreamWriter sr = File.CreateText(FILENAME);
            sr.Write(PointList.Text);
            sr.Close();

        }
        else
        {
            FileNameMessage.ForeColor = System.Drawing.Color.Red;
            FileNameMessage.Text = ": Enter File Name Before Saving :"; 
        }
    }
    protected void DrawPointList_Click(object sender, EventArgs e)
    {
        String FILENAME = Server.MapPath("Points.txt");
        StreamReader sr2 = File.OpenText(FILENAME);
        String contents = sr2.ReadToEnd();
        sr2.Close();

        //--Do line drawing here--\\
        //draw all points in current list

        string[] arInfo = new string[200];

        // define which character is seperating fields
        char[] splitter = { ',' };

        arInfo = contents.Split(splitter);
        int count = 0;

        int[] x1 = new int[200];
        int[] y1 = new int[200];
        int[] x2 = new int[200];
        int[] y2 = new int[200];

        for (int x = 0; x > -1; )
        {
            if (count == 0)
            {
                if (arInfo[x] != "")
                {
                    x1[count] = Int32.Parse(arInfo[x]);
                    x++;
                }
                else
                { break; }
                if (arInfo[x] != "")
                {
                    y1[count] = Int32.Parse(arInfo[x]);
                    x++;
                }
                else
                { break; }
            }
            else
            {
                if (arInfo[x] != "")
                {
                    x1[count] = x2[count - 1];
                    //x++;
                }
                else
                { break; }
                if (arInfo[x] != "")
                {
                    y1[count] = y2[count - 1];
                    //x++;
                }
                else
                { break; }
            }
            if (arInfo[x] != "")
            {
                x2[count] = Int32.Parse(arInfo[x]);
                x++;
            }
            else
            { break; }
            if (arInfo[x] != "")
            {
                y2[count] = Int32.Parse(arInfo[x]);
                x++;
            }
            else
            { break; }

            count++;
        }

        string jScript;
        jScript = "<script> var linecanvas_graphics = new Graphics('linecanvas');";
        int index = 0;
        if (count > 0)
        {
            for (; count != -1; count--)
            {

                jScript += "linecanvas_graphics.drawLine(" + x1[index] + "," + y1[index] + "," + x2[index] + "," + y2[index] + "); ";
                index++;
            }
        }
        jScript += "linecanvas_graphics.paint(); </script>";
        Page.RegisterClientScriptBlock("keyClientBlock", jScript);

    }
}