FormView does not have a defined namespace prefix asp - How should I specify my Page Directive?

After creating a basic web page using Microsoft Expression Web 4 with an ASP Connection to a local Access DB, I encountered an error when navigating to the page from another webpage. The browser displayed the following errors:

Error: Namespace prefix asp on FormView is not defined

Error: Unescaped '<' not allowed in attribute values

Realizing my lack of experience with ASP, I understand that I need a Page Directive at the beginning. What should the directive be for my page titled 'Make a Booking.aspx'?

The web page consists of HTML/CSS along with some sections of JavaScript. Here is the full source code:

htmlasp.netforms

Answer №1

It appears that you have copied the FormView code from another source and pasted it into an .aspx file, am I correct?

If that's the case, a standalone aspx page should resemble the following. However, this method limits the complexity of code usage since there is no code-behind file where more intricate actions can be handled.

<%@ Page Language="C#" %>

<!DOCTYPE html>
<html>
<head>
    <title>Demo</title>
</head>
<body>

    <form runat="server" id="form1">

        <asp:FormView ID="FormView1" runat="server" DataSourceID="SqlDataSource1">
            <ItemTemplate>

                <asp:Label ID="Label1" runat="server" Text='<%# Eval("column1") %>' /> 

                 or 

                 <%# Eval("column1") %>

            </ItemTemplate>
        </asp:FormView>

        <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="MyConnectionString" SelectCommand="select * from mytable" />

    </form>

</body>
</html>

To learn more about this topic, refer to the links provided. If you plan to work extensively on an aspx page, it is advisable to create a project in Visual Studio and proceed from there.

https://learn.microsoft.com/en-us/aspnet/web-forms/overview/data-access/custom-formatting/using-the-formview-s-templates-cs

Answer №2

When working within Microsoft Expression Web 4, I discovered that by going to Site > Site Settings, there is an important option for Previewing web pages using Microsoft Expression Development Server. Initially, it was set to only preview PHP and ASP.NET web pages:

For only PHP and ASP.NET web pages

To resolve the issue I was facing, I needed to change this setting to the second option available:

For ALL web pages

This adjustment now allows me to preview all my web pages, including HTML and ASPX pages, through LocalHost effectively.

Answer №3

Make sure to position the page directory at the top of your Asp page.

<%@ Page Title="YourTitle" Language="C#" AutoEventWireup="false" CodeBehind="YourCodeBehind.aspx.cs" Inherits="YourCodeBehindNamspace" %>

Verify that your web server is configured to utilize the .Net framework. It seems like the ASP.Net ISAPI filter may not be catching and interpreting the page correctly.

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