I add a label to a page and set its ID to LabelEditMessage and debug, and there it is.  Then in the code behind page (C#) I add a line of code LabelEditMessage.Text="test";  If I build, the build succeeds, but if I press the debug button it does another build that fails and tells me that LabelEditMessage Does Not Exist in the Current Context.  Intellisense knows about it, and I use that to enter the reference to be sure I am not mispelling. 

So I tried using FindControl, and that fails with a null reference.  It is there, I can see it, but Visual Web Developer refuses to acknowledge it's existence in the code behind file.  If I remove the code reference it builds fine and I can see the label with its default value when i debug, but I cannot reference the label in code.

I'm stumped.  It's such a simple thing that I have done many times before.  I just don't know what else to try.

I had an almost identical problem once before in the page load event trying to set the ConnectionString property of an SqlDataSource.  I tried everything I could think of for days.  Then one day I deleted a validator element and it suddenly started working, and I replaced the validator and it kept on working, so I dismissed it as a fluke.  But now it is back, only this time with a label rather than an SqlDataSource.  Naturally, I deleted the validator element from the page again, but this time it did not make the problem go away.

I'm stuck.

Anybody else ever observed a similar problem?

How exactly code behind file and the page markup look like? Are you placing assignment in the Page_Load?

I've tried a number of variations, including setting the lable text in the page load event, but this is what I have currently, which is in a RowUpdating event of a GridView control.  First the code file:

using System;
using System.Data;
using System.Configuration;
using System.Collections;
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;

public partial class regGridSess : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        this.SqlDataSourceGrid.ConnectionString = "Dsn=MISDATA;uid="
            + Session["uid"].ToString()
            + ";pwd="
            + Session["pwd"].ToString();

        Label bannerLabel = (Label)Master.FindControl("bannerText");
        bannerLabel.Text = "Registrations for a Session";

        if (!IsPostBack) return;   // First time in page code.

        // Form has been posted.

    }

    protected void Button1_Click(object sender, EventArgs e)
    {
        GridView1.Visible = true;
    }
    protected void TextBox1_TextChanged(object sender, EventArgs e)
    {
        TextBox1.Text = TextBox1.Text.PadLeft(6, Char.Parse("0"));
    }
    protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
    {
        LabelEditMessage.Text = "test";
        e.Cancel = true;
    }
}


Here is the ASP source:


<%@ Page Language="C#" MasterPageFile="~/MISDefault.master" AutoEventWireup="true" CodeFile="regGridSess.aspx.cs" Inherits="regGridSess" Title="Registration Grid for a Session" %>
<asp:Content ID="Content1" ContentPlaceHolderID="mainContent" Runat="Server">
    <asp:Label ID="Label1" runat="server" Text="Session Number:"></asp:Label><asp:TextBox
        ID="TextBox1" runat="server" OnTextChanged="TextBox1_TextChanged"></asp:TextBox><asp:Button
            ID="Button1" runat="server" OnClick="Button1_Click" Text="Show Registrations" />&nbsp;
    <asp:RegularExpressionValidator
                ID="sessNumValidator" runat="server" ControlToValidate="TextBox1" ErrorMessage="Session number must be one to 6 numeric digits"
                ValidationExpression="\d{1,6}"></asp:RegularExpressionValidator>&nbsp;
    <asp:SqlDataSource ID="SqlDataSourceGrid" runat="server" ConnectionString="<%$ ConnectionStrings:MisWeb %>"
        DeleteCommand='DELETE FROM "Register" WHERE "Sess_Num" = ? AND "Ptcpnt_SSN" = ?'
        InsertCommand='INSERT INTO "Register" ("Sess_Num", "Ptcpnt_SSN", "Credit_Type", "Pay_Code", "Stat", "ShowedUp", "Confirmation_Notice", "Fee_Stat", "Pay_Date", "Pay_Amt", "Credit_Hours", "District_PO", "Credit_Card_Num", "Credit_Card_Type", "Credit_Card_Name", "Credit_Card_Expiration", "Check_Num", "Cash_Rcpt_Num", "Cert_Printed", "Fee_Amt", "Refund_Amt", "Date_Billed", "Dist_Code", "Camp_Code", "Billing_Name", "Billing_Addr_Line_1", "Billing_Addr_Line_2", "Billing_City", "Billing_State", "Billing_Zip") VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)'
        ProviderName="<%$ ConnectionStrings:MisWeb.ProviderName %>" SelectCommand='SELECT "Sess_Num", "Ptcpnt_SSN", "Credit_Type", "Pay_Code", "Stat", "ShowedUp", "Confirmation_Notice", "Fee_Stat", "Pay_Date", "Pay_Amt", "Credit_Hours", "Registration_Date", "District_PO", "Credit_Card_Num", "Credit_Card_Type", "Credit_Card_Name", "Credit_Card_Expiration", "Web_Registration", "Check_Num", "Cash_Rcpt_Num", "Cert_Printed", "Inv_WO", "Fee_Amt", "Refund_Amt", "Date_Billed", "Dist_Code", "Camp_Code", "DropCancel_Date", "Billing_Name", "Billing_Addr_Line_1", "Billing_Addr_Line_2", "Billing_City", "Billing_State", "Billing_Zip" FROM "Register"  WHERE "Sess_Num" = ? '
        UpdateCommand='UPDATE "Register" SET "Credit_Type" = ?, "Pay_Code" = ?, "Stat" = ?, "ShowedUp" = ?, "Confirmation_Notice" = ?, "Fee_Stat" = ?, "Pay_Date" = ?, "Pay_Amt" = ?, "Credit_Hours" = ?, "District_PO" = ?, "Credit_Card_Type" = ?, "Credit_Card_Name" = ?, "Credit_Card_Expiration" = ?, "Check_Num" = ?, "Cash_Rcpt_Num" = ?, "Cert_Printed" = ?, "Fee_Amt" = ?, "Refund_Amt" = ?, "Date_Billed" = ?, "Dist_Code" = ?, "Camp_Code" = ?, "Billing_Name" = ?, "Billing_Addr_Line_1" = ?, "Billing_Addr_Line_2" = ?, "Billing_City" = ?, "Billing_State" = ?, "Billing_Zip" = ? WHERE "Sess_Num" = ? AND "Ptcpnt_SSN" = ?'>
        <DeleteParameters>
            <asp:Parameter Name="Sess_Num" Type="String" />
            <asp:Parameter Name="Ptcpnt_SSN" Type="String" />
        </DeleteParameters>
        <UpdateParameters>
            <asp:Parameter Name="Credit_Type" Type="String" />
            <asp:Parameter Name="Pay_Code" Type="String" />
            <asp:Parameter Name="Stat" Type="String" />
            <asp:Parameter Name="ShowedUp" Type="String" />
            <asp:Parameter Name="Confirmation_Notice" Type="String" />
            <asp:Parameter Name="Fee_Stat" Type="String" />
            <asp:Parameter Name="Pay_Date" Type="DateTime" />
            <asp:Parameter Name="Pay_Amt" Type="Decimal" />
            <asp:Parameter Name="Credit_Hours" Type="String" />
            <asp:Parameter Name="District_PO" Type="String" />
            <asp:Parameter Name="Credit_Card_Type" Type="String" />
            <asp:Parameter Name="Credit_Card_Name" Type="String" />
            <asp:Parameter Name="Credit_Card_Expiration" Type="String" />
            <asp:Parameter Name="Check_Num" Type="String" />
            <asp:Parameter Name="Cash_Rcpt_Num" Type="String" />
            <asp:Parameter Name="Cert_Printed" Type="String" />
            <asp:Parameter Name="Fee_Amt" Type="Decimal" />
            <asp:Parameter Name="Refund_Amt" Type="Decimal" />
            <asp:Parameter Name="Date_Billed" Type="DateTime" />
            <asp:Parameter Name="Dist_Code" Type="String" />
            <asp:Parameter Name="Camp_Code" Type="String" />
            <asp:Parameter Name="Billing_Name" Type="String" />
            <asp:Parameter Name="Billing_Addr_Line_1" Type="String" />
            <asp:Parameter Name="Billing_Addr_Line_2" Type="String" />
            <asp:Parameter Name="Billing_City" Type="String" />
            <asp:Parameter Name="Billing_State" Type="String" />
            <asp:Parameter Name="Billing_Zip" Type="String" />
            <asp:Parameter Name="Sess_Num" Type="String" />
            <asp:Parameter Name="Ptcpnt_SSN" Type="String" />
        </UpdateParameters>
        <SelectParameters>
            <asp:ControlParameter ControlID="TextBox1" DefaultValue="000000" Name="Sess_Num"
                PropertyName="Text" />
        </SelectParameters>
        <InsertParameters>
            <asp:Parameter Name="Sess_Num" Type="String" />
            <asp:Parameter Name="Ptcpnt_SSN" Type="String" />
            <asp:Parameter Name="Credit_Type" Type="String" />
            <asp:Parameter Name="Pay_Code" Type="String" />
            <asp:Parameter Name="Stat" Type="String" />
            <asp:Parameter Name="ShowedUp" Type="String" />
            <asp:Parameter Name="Confirmation_Notice" Type="String" />
            <asp:Parameter Name="Fee_Stat" Type="String" />
            <asp:Parameter Name="Pay_Date" Type="DateTime" />
            <asp:Parameter Name="Pay_Amt" Type="Decimal" />
            <asp:Parameter Name="Credit_Hours" Type="String" />
            <asp:Parameter Name="District_PO" Type="String" />
            <asp:Parameter Name="Credit_Card_Num" Type="String" />
            <asp:Parameter Name="Credit_Card_Type" Type="String" />
            <asp:Parameter Name="Credit_Card_Name" Type="String" />
            <asp:Parameter Name="Credit_Card_Expiration" Type="String" />
            <asp:Parameter Name="Check_Num" Type="String" />
            <asp:Parameter Name="Cash_Rcpt_Num" Type="String" />
            <asp:Parameter Name="Cert_Printed" Type="String" />
            <asp:Parameter Name="Fee_Amt" Type="Decimal" />
            <asp:Parameter Name="Refund_Amt" Type="Decimal" />
            <asp:Parameter Name="Date_Billed" Type="DateTime" />
            <asp:Parameter Name="Dist_Code" Type="String" />
            <asp:Parameter Name="Camp_Code" Type="String" />
            <asp:Parameter Name="Billing_Name" Type="String" />
            <asp:Parameter Name="Billing_Addr_Line_1" Type="String" />
            <asp:Parameter Name="Billing_Addr_Line_2" Type="String" />
            <asp:Parameter Name="Billing_City" Type="String" />
            <asp:Parameter Name="Billing_State" Type="String" />
            <asp:Parameter Name="Billing_Zip" Type="String" />
        </InsertParameters>
    </asp:SqlDataSource>
    <asp:SqlDataSource ID="SqlDataSourceCredit" runat="server" ConnectionString="<%$ ConnectionStrings:MisWeb %>"
        ProviderName="<%$ ConnectionStrings:MisWeb.ProviderName %>" SelectCommand="SELECT [credit_type_code], [credit_type_descr] FROM [Credit_Type] WHERE ([Credit_Type_Active] = ?) ORDER BY [credit_type_code]">
        <SelectParameters>
            <asp:Parameter DefaultValue="Y" Name="Credit_Type_Active" Type="String" />
        </SelectParameters>
    </asp:SqlDataSource>
    <br />
    <asp:Label ID="LabelEditMessage" runat="server" ForeColor="Red" Width="1040px">xxx</asp:Label><br />
    <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" BackColor="White"
        BorderColor="#999999" BorderStyle="None" BorderWidth="1px" CellPadding="3" DataKeyNames="Sess_Num,Ptcpnt_SSN"
        DataSourceID="SqlDataSourceGrid" EmptyDataText="There are no data records to display."
        GridLines="Vertical" Visible="False" AllowSorting="True" OnRowUpdating="GridView1_RowUpdating">
        <FooterStyle BackColor="#CCCCCC" ForeColor="Black" />
        <Columns>
            <asp:CommandField ShowDeleteButton="True" ShowEditButton="True" />
            <asp:BoundField DataField="Sess_Num" HeaderText="Sess_Num" ReadOnly="True" SortExpression="Sess_Num" Visible="False" />
            <asp:BoundField DataField="Ptcpnt_SSN" HeaderText="Ptcpnt_SSN" ReadOnly="True" SortExpression="Ptcpnt_SSN" />
            <asp:TemplateField HeaderText="Credit_Type" SortExpression="Credit_Type">
                <EditItemTemplate>
                    <asp:DropDownList ID="DropDownList7" runat="server" DataSourceID="SqlDataSourceCredit"
                        DataTextField="credit_type_descr" DataValueField="credit_type_code" SelectedValue='<%# Bind("Credit_Type") %>'>
                    </asp:DropDownList>
                </EditItemTemplate>
                <ItemTemplate>
                    <asp:Label ID="Label7" runat="server" Text='<%# Bind("Credit_Type") %>'></asp:Label>
                </ItemTemplate>
            </asp:TemplateField>
             <asp:TemplateField HeaderText="Pay_Code" SortExpression="Pay_Code">
                <EditItemTemplate>
                    <asp:DropDownList ID="DropDownList5" runat="server"
                        DataTextField="Pay_Code" DataValueField="Pay_Code" SelectedValue='<%# Bind("Pay_Code") %>'>
                        <asp:ListItem Selected="True" Value=" ">No Fee</asp:ListItem>
                        <asp:ListItem Value="D">District</asp:ListItem>
                        <asp:ListItem Value="I">Individual</asp:ListItem>
                    </asp:DropDownList>
                </EditItemTemplate>
                <ItemTemplate>
                    <asp:Label ID="Label5" runat="server" Text='<%# Bind("Pay_Code") %>'></asp:Label>
                </ItemTemplate>
            </asp:TemplateField>
           <asp:TemplateField HeaderText="Stat" SortExpression="Stat">
                <EditItemTemplate>
                    <asp:DropDownList ID="DropDownList6" runat="server"
                        DataTextField="Stat" DataValueField="Stat" SelectedValue='<%# Bind("Stat") %>'>
                        <asp:ListItem Selected="True" Value=" ">Unconfirmed</asp:ListItem>
                        <asp:ListItem Value="F">Confirmed</asp:ListItem>
                        <asp:ListItem Value="D">Dropped</asp:ListItem>
                        <asp:ListItem Value="C">Cancelled</asp:ListItem>
                        <asp:ListItem Value="L">Closed</asp:ListItem>
                        <asp:ListItem Value="W">Wait List</asp:ListItem>
                    </asp:DropDownList>
                </EditItemTemplate>
                <ItemTemplate>
                    <asp:Label ID="Label6" runat="server" Text='<%# Bind("Stat") %>'></asp:Label>
                </ItemTemplate>
            </asp:TemplateField>
            <asp:TemplateField HeaderText="ShowedUp" SortExpression="ShowedUp">
                <EditItemTemplate>
                    <asp:DropDownList ID="DropDownList1" runat="server"
                        DataTextField="ShowedUp" DataValueField="ShowedUp" SelectedValue='<%# Bind("ShowedUp") %>'>
                        <asp:ListItem Selected="True" Value="Y">Yes</asp:ListItem>
                        <asp:ListItem Value="N">No</asp:ListItem>
                    </asp:DropDownList>
                </EditItemTemplate>
                <ItemTemplate>
                    <asp:Label ID="Label1" runat="server" Text='<%# Bind("ShowedUp") %>'></asp:Label>
                </ItemTemplate>
            </asp:TemplateField>
            <asp:TemplateField HeaderText="Confirmation_Notice" SortExpression="Confirmation_Notice">
                <EditItemTemplate>
                    <asp:DropDownList ID="DropDownList2" runat="server"
                        DataTextField="Confirmation_Notice" DataValueField="Confirmation_Notice" SelectedValue='<%# Bind("Confirmation_Notice") %>'>
                        <asp:ListItem Selected="True" Value="Y">Yes</asp:ListItem>
                        <asp:ListItem Value="N">No</asp:ListItem>
                    </asp:DropDownList>
                </EditItemTemplate>
                <ItemTemplate>
                    <asp:Label ID="Label2" runat="server" Text='<%# Bind("Confirmation_Notice") %>'></asp:Label>
                </ItemTemplate>
            </asp:TemplateField>
            <asp:TemplateField HeaderText="Fee_Stat" SortExpression="Fee_Stat">
                <EditItemTemplate>
                    <asp:DropDownList ID="DropDownList8" runat="server"
                        DataTextField="Fee_Stat" DataValueField="Fee_Stat" SelectedValue='<%# Bind("Fee_Stat") %>'>
                        <asp:ListItem Selected="True" Value="F">Free</asp:ListItem>
                        <asp:ListItem Value="R">Refund</asp:ListItem>
                        <asp:ListItem Value="P">Paid</asp:ListItem>
                        <asp:ListItem Value="B">Refund (Cancel)</asp:ListItem>
                        <asp:ListItem Value="T">Transfer</asp:ListItem>
                        <asp:ListItem Value="U">Unpaid</asp:ListItem>
                    </asp:DropDownList>
                </EditItemTemplate>
                <ItemTemplate>
                    <asp:Label ID="Label8" runat="server" Text='<%# Bind("Fee_Stat") %>'></asp:Label>
                </ItemTemplate>
            </asp:TemplateField>
            <asp:BoundField DataField="Pay_Date" HeaderText="Pay_Date" SortExpression="Pay_Date" />
            <asp:BoundField DataField="Pay_Amt" HeaderText="Pay_Amt" SortExpression="Pay_Amt" />
            <asp:BoundField DataField="Credit_Hours" HeaderText="Credit_Hours" SortExpression="Credit_Hours" />
            <asp:BoundField DataField="Registration_Date" HeaderText="Registration_Date" SortExpression="Registration_Date" InsertVisible="False" ReadOnly="True" />
            <asp:BoundField DataField="District_PO" HeaderText="District_PO" SortExpression="District_PO" />
            <asp:BoundField DataField="Credit_Card_Num" HeaderText="Credit_Card_Num" SortExpression="Credit_Card_Num" Visible="False" />
            <asp:BoundField DataField="Credit_Card_Type" HeaderText="Credit_Card_Type" SortExpression="Credit_Card_Type" />
            <asp:BoundField DataField="Credit_Card_Name" HeaderText="Credit_Card_Name" SortExpression="Credit_Card_Name" />
            <asp:BoundField DataField="Credit_Card_Expiration" HeaderText="Credit_Card_Expiration"
                SortExpression="Credit_Card_Expiration" />
            <asp:BoundField DataField="Web_Registration" HeaderText="Web_Registration" SortExpression="Web_Registration" InsertVisible="False" ReadOnly="True" />
            <asp:BoundField DataField="Check_Num" HeaderText="Check_Num" SortExpression="Check_Num" />
            <asp:BoundField DataField="Cash_Rcpt_Num" HeaderText="Cash_Rcpt_Num" SortExpression="Cash_Rcpt_Num" />
            <asp:TemplateField HeaderText="Cert_Printed" SortExpression="Cert_Printed">
                <EditItemTemplate>
                    <asp:DropDownList ID="DropDownList3" runat="server"
                        DataTextField="Cert_Printed" DataValueField="Cert_Printed" SelectedValue='<%# Bind("Cert_Printed") %>'>
                        <asp:ListItem Selected="True" Value="Y">Yes</asp:ListItem>
                        <asp:ListItem Value="N">No</asp:ListItem>
                    </asp:DropDownList>
                </EditItemTemplate>
                <ItemTemplate>
                    <asp:Label ID="Label3" runat="server" Text='<%# Bind("Cert_Printed") %>'></asp:Label>
                </ItemTemplate>
            </asp:TemplateField>
            <asp:BoundField DataField="Inv_WO" HeaderText="Inv_WO" SortExpression="Inv_WO" InsertVisible="False" ReadOnly="True" />
            <asp:BoundField DataField="Fee_Amt" HeaderText="Fee_Amt" SortExpression="Fee_Amt" />
            <asp:BoundField DataField="Refund_Amt" HeaderText="Refund_Amt" SortExpression="Refund_Amt" />
            <asp:BoundField DataField="Date_Billed" HeaderText="Date_Billed" SortExpression="Date_Billed" />
            <asp:BoundField DataField="Dist_Code" HeaderText="Dist_Code" SortExpression="Dist_Code" />
            <asp:BoundField DataField="Camp_Code" HeaderText="Camp_Code" SortExpression="Camp_Code" />
            <asp:BoundField DataField="DropCancel_Date" HeaderText="DropCancel_Date" SortExpression="DropCancel_Date" InsertVisible="False" ReadOnly="True" />
            <asp:BoundField DataField="Billing_Name" HeaderText="Billing_Name" SortExpression="Billing_Name" />
            <asp:BoundField DataField="Billing_Addr_Line_1" HeaderText="Billing_Addr_Line_1"
                SortExpression="Billing_Addr_Line_1" />
            <asp:BoundField DataField="Billing_Addr_Line_2" HeaderText="Billing_Addr_Line_2"
                SortExpression="Billing_Addr_Line_2" />
            <asp:BoundField DataField="Billing_City" HeaderText="Billing_City" SortExpression="Billing_City" />
            <asp:BoundField DataField="Billing_State" HeaderText="Billing_State" SortExpression="Billing_State" />
            <asp:BoundField DataField="Billing_Zip" HeaderText="Billing_Zip" SortExpression="Billing_Zip" />
        </Columns>
        <RowStyle BackColor="#EEEEEE" ForeColor="Black" />
        <SelectedRowStyle BackColor="#008A8C" Font-Bold="True" ForeColor="White" />
        <PagerStyle BackColor="#999999" ForeColor="Black" HorizontalAlign="Center" />
        <HeaderStyle BackColor="#000084" Font-Bold="True" ForeColor="White" />
        <AlternatingRowStyle BackColor="Gainsboro" />
    </asp:GridView>
</asp:Content>

New but equally baffling information:

If I remove the reference to the label so the build will succeed and set a break point at that spot in the code, then when I hit the breakpoint I can see the label in the local variable panel and change its text property and it shows up on the page and works fine.  So it is definitely defined in that context.  The error message is wrong.  I think this has to be a bug or something corrupted.

I think I figured this out by myself, so I thought I should post and share in case it might help somebody else one day.

I discovered that if I simply used VWD as an editor and save my changes and then go pull up the pages in a web browser without trying to debug or "start without debug" from the IDE then the extra build done prior to a debug was not attempted, thus did not fail, and the page loaded and worked normally from outside of VWD.

Then I found an option to turn off the build prior to debug in VWD, so now it all works like it should by skipping that final build.

Here is my theory on why this is so.  I believe that once the page has been displayed in a browser, the assembly's .dll file has been loaded into memory by IIS and is thus marked as in use and only IIS can unloaded it and recompile and load a fresh copy.  If VWD does a build for a debug run that tries to replace the dll it cannot do so, and is working with an older version in memory vs newer modified source code.  That explains why I could build from the build menu in VWD successfully, but the build done in prep for a debug was not successful because that build tried to replace a dll file in use by IIS.  Just changing the source file and letting IIS discover the change and recompile dynamically caused IIS to unload and reload the dll, which is the only way it could work once IIS had originally loaded it.  So this problem may not occur when using the web server that comes with VWD, and it definitely does not occur if you turn of the build.

Moral of the story:  If you are testing in IIS, you should go to the website menu in VWD, click start options, click "build" on the tree in the left pane, and on the dropdown list labelled "Before running startup page" select "No Build".  Works for me.

Keith

wow - this helped a lot!  I was having the same problem.  Thanks!

cheers Tepi for posting the fix - just had a very confusing 30 minutes with the same prob - turning build off sorted it.....

I guess you can say this post has helped one more person.  I was baffled why I could not figure out what happened.  I even went through all of the temporary asp.net files looking for a reason.

I sincerly appreciate you sharing this information - cheers!

well, i had the same problem... but here is my situation and the solution: i had a file called details.aspx which was using details.aspx.cs as the code file. As soon I have created this file i said maybe i will use the layout later so i just copy-paste and rename it as template.aspx. I continued my work on details.aspx by adding textboxes, labels etc... and methods in the .cs file. but on "Build" stage i got the magic error "The name xxx Does Not Exist in the Current Context". Reason: i was using the same .cs file name for both template.aspx and details.aspx, but the controls were only on the details.aspx... I can imagine how confuse was the compiler...  so i changed the .cs file name for the template.aspx and all build up successfully...

 Thanks for this post.  I too had multiple aspx files referencing the same code behind file.  I was trying to add a button to one of my aspx files and I kept getting the Does Not Exist in Current Context error.  Once I excluded my other aspx files from the IDE everything compiled.  Thanks again.