I know I did this in Visual Studio 2003 (ASP.NET 1.1), but can't seem to do it in Visual Studio 2005 (ASP.NET 3.5?). I've got a page that's part of a master page.  The project is an AJAX project.  From the aspx page, I'm trying to call myFunction(ID) with the following: <%# myFunction(ID) %>.  On the codebehind page, I have the following as part of the partial public class:

 

    Public Function myFunction(ByVal ID As Integer) As String
        Return ID.ToString
    End Function
 

My function actually does more, but I figured I'd keep things simplified.  Visual Studio 2005 says "Name 'myFunction' is not declared".  What am I doing wrong?  This worked great in Visual Studio 2003.

 

Thanks,

Dan 

 Check to see where you are calling myFunction from - the content page or master page and where's it defined, in the content page or master page?  If myFunction is defined in the master page you may need to use the Me.Master property to access it and call it.

 It's in the content page as part of the page's class.

Just to clarify, the function is in the content page codebehind.  The function is called from the content page as well.  Thanks.

 The code you've shown should work - it looks good.  I've created a Master Page w/a content page and a myFunction as you've described to test it out and it works great.  Is the ID parameter set somewhere else or used in a data binding expression?  Perhaps if you can post the rest of the functions code if possible that might point toward what the problem is.

Weird... here's the entire code of a sample page that's erroring... just in case I missed something (I only changed the main project name to MyProject for security reasons).  The solution has two projects, UserInterface and BusinessLogic.  The BusinessLogic project is just a bunch of classes.

----ASPX page 

<%@ Page Language="vb" AutoEventWireup="false" MasterPageFile="~/MyProject.Master" CodeBehind="zTestForForum.aspx.vb" Inherits="UserInterface.zTestForForum"
    title="Untitled Page" %>
<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" runat="server">
    <%#f_MyFunction(1)%>
</asp:Content>

 ----CodeBehind

Public Partial Class zTestForForum
    Inherits System.Web.UI.Page

    Public Function f_MyFunction(ByVal ID As Integer) As String
        Return ID.ToString
    End Function

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

    End Sub

End Class

 

Thanks,

Dan 

quizwedge:

Weird... here's the entire code of a sample page that's erroring... just in case I missed something (I only changed the main project name to MyProject for security reasons).  The solution has two projects, UserInterface and BusinessLogic.  The BusinessLogic project is just a bunch of classes.

----ASPX page 

<%@ Page Language="vb" AutoEventWireup="false" MasterPageFile="~/MyProject.Master" CodeBehind="zTestForForum.aspx.vb" Inherits="UserInterface.zTestForForum"
    title="Untitled Page" %>
<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" runat="server">
    <%#f_MyFunction(1)%>
</asp:Content>

 ----CodeBehind

Public Partial Class zTestForForum
    Inherits System.Web.UI.Page

    Public Function f_MyFunction(ByVal ID As Integer) As String
        Return ID.ToString
    End Function

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

    End Sub

End Class

 

Thanks,

Dan 

 

Hi,

The expression inside <%# %> will be executed only when DataBind method is called. The expression inside <%= %> will be executed when it appears in the page.

In your case, you can use the <%=f_MyFunction(1) %>.

 

I hope this helps.

 I tried switching from # to = and still got the Name 'f_MyFunction' is not declared.

Hi,

Thanks for your response.

Does the codebehind class have a namespace? If yes, we need to add the namespace in the Inherits section of Page directive. In your case, I cannot see the namespace in the codebehind, but you use a namespace in the Inherits section of this Page directive. For more information about Page directive, see http://msdn2.microsoft.com/en-us/library/ydy4x04a(VS.80).aspx

 

I hope this helps.

 

okay, that's bizarre... now it's working fine.  Oh, well, I guess I just shouldn't question it. :)  At least I know that what I did is correct.

Thanks,

Dan 

I'm running into this same thing a LOT!  I have a web site project that was created in VS05 and runs great. I've tried to move some of the pages to a VS08 project and I get the "Function Not Delcared" error. I also periodically get an error that a variable hasn't been declared in the code behind the page for a simple label that exists in the page.  What is the deal with VS???  Has anyone discovered why this happens??

Make sure that you are calling Page.DataBind().

cheers 

Old post but I have the same situation. I am trying to call a function in my code behind form a aspx page. The thing is that this page is using inline coding module as opposed to code behind. I have a header.ascx file that has the function: void SiteName(Object sender, EventArgs e) { if (string.Compare(G_site.name, string.Empty) != 0) { LiteralWelcome.Text = ""; LiteralWelcome.Text += "