c# error message:The name 'TotalDays3' does not exist in the current context

Hi experts, I am getting the following error in c# with visual web developer 2005 express edition.
My code is at the end, I do realize I have not added any namespace for type class libraries such as:
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
Compiler Error Message: CS0103: The name 'TotalDays3' does not exist in the current context
Source Error:
Line 114:            Response.Write("TotalDays:");
Line 115:            Response.Write("#");
Line 116:            Response.Write(TotalDays3);
Line 117:            Response.Write("#");
Line 118:        }
 The complete code is as follows, it works if line 116 is deleted.
<script runat="server">
    void Page_Load(Object Src, EventArgs E)
    {
        if (!Page.IsPostBack)
        {
            ArrayList YAL = new ArrayList();
            ArrayList MAL = new ArrayList();
            ArrayList DAL = new ArrayList();
            int i = 0;
            int a = 1900;
            int j = 0;
            int b = 1;
            int k = 0;
            int c = 1;

            ArrayList YALE = new ArrayList();
            ArrayList MALE = new ArrayList();
            ArrayList DALE = new ArrayList();
            int l = 0;
            int d = 1900;
            int m = 0;
            int e = 1;
            int n = 0;
            int f = 1;
           
            while (i < 110)
            {
                YAL.Add(a++);
                i++;
            }
            Dropdownlist1.Items.Add("");
            Dropdownlist1.DataSource = YAL;
            Dropdownlist1.DataBind();
            while (l < 110)
            {
                YALE.Add(d++);
                l++;
            }
            Dropdownlist4.Items.Add("");
            Dropdownlist4.DataSource = YALE;
            Dropdownlist4.DataBind();
           
            while (j < 12)
            {
                MAL.Add(b++);
                j++;
            }
            Dropdownlist2.Items.Add("");
            Dropdownlist2.DataSource = MAL;
            Dropdownlist2.DataBind();
            while (m < 12)
            {
                MALE.Add(e++);
                m++;
            }
            Dropdownlist5.Items.Add("");
            Dropdownlist5.DataSource = MALE;
            Dropdownlist5.DataBind();
           
            while (k < 30)
            {
                DAL.Add(c++);
                k++;
            }
            Dropdownlist3.Items.Add("");
            Dropdownlist3.DataSource = DAL;
            Dropdownlist3.DataBind();
            while (n < 30)
            {
                DALE.Add(f++);
                n++;
            }
            Dropdownlist6.Items.Add("");
            Dropdownlist6.DataSource = DALE;
            Dropdownlist6.DataBind();

            long years = 0;
            years = Convert.ToInt64(Dropdownlist1.SelectedItem.Value);
            years = (years - 1900) * 365;
            ///Response.Write(years + "days + ");
            long months = 0;
            months = Convert.ToInt64(Dropdownlist2.SelectedItem.Value);
            months = months * 30;
            ///Response.Write(months + "days + ");
            long days = 0;
            days = Convert.ToInt64(Dropdownlist3.SelectedItem.Value);
            ///Response.Write(days + "days = ");
            long TotalDays = 0;
            TotalDays = years + months + days;
            ///Response.Write(TotalDays + "Total days");
            ///Response.Write("            ");
            long years2 = 0;
            years2 = Convert.ToInt64(Dropdownlist4.SelectedItem.Value);
            years2 = (years2 - 1900) * 365;
            ///Response.Write(years2 + "days + ");
            long months2 = 0;
            months2 = Convert.ToInt64(Dropdownlist5.SelectedItem.Value);
            months2 = months2 * 30;
            ///Response.Write(months2 + "days + ");
            long days2 = 0;
            days2 = Convert.ToInt64(Dropdownlist6.SelectedItem.Value);
            ///Response.Write(days2 + "days = ");
            long TotalDays2 = 0;
            TotalDays2 = years2 + months2 + days2;
           
            long TotalDays3 = 0;
            TotalDays3 = TotalDays2 - TotalDays;
            ///output3.Text = "TotalDays:" + TotalDays2.ToString();
            ///Response.Write("<br/><br/><br/><br/><br/><br/><br/>" + "TotalDays:" + TotalDays3);
        }
        else
        {
            Response.Write("TotalDays:");
            Response.Write("#");
            Response.Write(TotalDays3);
            Response.Write("#");
        }
    }
    protected void Button1_Click1(object sender, EventArgs e)
    {
        output.Text = "Day:" + Dropdownlist3.SelectedItem.Value + " month:" + Dropdownlist2.SelectedItem.Value + " year:" + Dropdownlist1.SelectedItem.Value + " ";
    }
    protected void Button2_Click2(object sender, EventArgs e)
    {
        output2.Text = "Day:" + Dropdownlist6.SelectedItem.Value + " month:" + Dropdownlist5.SelectedItem.Value + " year:" + Dropdownlist4.SelectedItem.Value;
    }
    </script>
<html>
<head>
<title>Date Test</title>
</head>
<body>
<form id="form1" runat="server">
<asp:ValidationSummary id="validSummary" runat="server"
headerText="*** Errors On Your Form ***"
showSummary="True"
displayMode="List" />
    <br />
<asp:DropDownList runat="server" id="Dropdownlist1" />
<asp:DropDownList runat="server" id="Dropdownlist2" />
<asp:DropDownList runat="server" id="Dropdownlist3" />
<asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_Click1" />
<asp:Label runat="server" id="output" />

<asp:DropDownList runat="server" id="Dropdownlist4" />
<asp:DropDownList runat="server" id="Dropdownlist5" />
<asp:DropDownList runat="server" id="Dropdownlist6" />
<asp:Button ID="Button2" runat="server" Text="Button" OnClick="Button2_Click2" />
<asp:Label runat="server" id="output2" />
    <br />
    <br />
<asp:Label runat="server" id="output3" />
</form>
</body>
</html>