using the ASP.Net 3.5 ListView within a WebPart - Databinding methods such as Eval(), XPath(), and Bind() can only be used in controls contained in a page. - BBB

using the ASP.Net 3.5 ListView within a WebPart - Databinding methods such as Eval(), XPath(), and Bind() can only be used in controls contained in a page.

Last week I was working on a news archive, and i wanted to display the results in a listview. I decided to use the ASP.Net 3.5 ListView, but for some reason, I couldn't get it to work. Although I am a experienced "googler" (or googlar?!) I really couldn't find any solution on the error's that I got while trying to add this Control.

These were the problems that i Encountered and it's solutions.

I added the ListView in code and added the following ItemTemplate:

<%@ Control Language="C#" %>
<li>
<asp:Label ID="DateLabel" runat="Server" Text='<%# Eval("Date")%>' />
</li>

WHen trying to load the page, i Got thje following error:

Exception Details: System.InvalidOperationException: Databinding methods such as Eval(), XPath(), and Bind() can only be used in controls contained in a page.

Well, as the exception tells: the Eval function isnt allowed to be used in a template, so i decided to use the DataBinder method:

<%@ Control Language="C#" %>
<li>
<asp:Label ID="DateLabel" runat="Server" Text='<%# DataBinder.Eval(Container, "Date")%>' />
</li>

It throwed the followin exception:

DataBinding: 'System.Web.UI.WebControls.ListViewDataItem' does not contain a property with the name 'Date'.

After that, I realised myself that I shouldn't use the conainter, but the DataItem of the container, so I modified my template:

<%@ Control Language="C#" %>
<li>
<asp:Label ID="DateLabel" runat="Server" Text='<%# DataBinder.Eval(Container.DataItem, "Date")%>' />
</li>

this template throws an compilation error: Compiler Error Message: CS0117: 'System.Web.UI.Control' does not contain a definition for 'DataItem'. And why? We are using the ASP.Net 3.5 listview control, so there is a chance that namespace is extended with thte DataItem. So I tried to cast the DataItem to the specific ListViewDataItem:

<%@ Control Language="C#" %>
<li>
<asp:Label ID="DateLabel" runat="Server" Text='<%# DataBinder.Eval(((System.Web.UI.WebControls.ListViewDataItem)(Container)).DataItem, "Date", "{0:dd-MM-yyyy}")%>' />
</li>

I was sure that I was Another step closer to the solution. Hitting F5 in my browser got the the following exception:
Compiler Error Message: CS0234: The type or namespace name 'ListViewDataItem' does not exist in the namespace 'System.Web.UI.WebControls' (are you missing an assembly reference?)

After adding the Assembly for the asp.net 3.5 ListView, I got the following code:

<%@ Control Language="C#" %>
<%@Assembly Name="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" %>
<li>
<asp:Label ID="DateLabel" runat="Server" Text='<%# DataBinder.Eval(((System.Web.UI.WebControls.ListViewDataItem)(Container)).DataItem, "Date", "{0:dd-MM-yyyy}")%>' />
</li>

A last refresh of my browser made me happy: no error's and a nice, working asp.net 3.5 ListView.

Published Mon, Apr 6 2009 11:17 AM by Bas

Filed under: WebControl, Template, ListView

Comments

# re: using the ASP.Net 3.5 ListView within a WebPart - Databinding methods such as Eval(), XPath(), and Bind() can only be used in controls contained in a page.

Thursday, April 16, 2009 8:36 AM by آموزش مجازی

thanks i have encountered this problem frequently

# re: using the ASP.Net 3.5 ListView within a WebPart - Databinding methods such as Eval(), XPath(), and Bind() can only be used in controls contained in a page.

Friday, August 06, 2010 4:13 PM by digu

plese insert demo in your site if possible

It's necessary in this time

coding is providing by every site

demo plus coding is reach concept right now

# re: using the ASP.Net 3.5 ListView within a WebPart - Databinding methods such as Eval(), XPath(), and Bind() can only be used in controls contained in a page.

Wednesday, September 29, 2010 7:22 AM by are there casinos in italy

Thanks for the site. In this site having important information of asp.net 3.5. with the information of asp.net 3.5 I have solved many error.

# re: using the ASP.Net 3.5 ListView within a WebPart - Databinding methods such as Eval(), XPath(), and Bind() can only be used in controls contained in a page.

Friday, November 16, 2012 6:18 AM by net grid

The grid provides broad capabilities of working with data such as arbitrary class objects, row arrays, objects implementing IList or IDictionary interfaces and objects with variable number of fields.more information visit dapfor. com

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using the ASP.Net 3.5 ListView within a WebPart - Databinding methods such as Eval(), XPath(), and Bind() can only be used in controls contained in a page.

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# re: using the ASP.Net 3.5 ListView within a WebPart - Databinding methods such as Eval(), XPath(), and Bind() can only be used in controls contained in a page.

# re: using the ASP.Net 3.5 ListView within a WebPart - Databinding methods such as Eval(), XPath(), and Bind() can only be used in controls contained in a page.

# re: using the ASP.Net 3.5 ListView within a WebPart - Databinding methods such as Eval(), XPath(), and Bind() can only be used in controls contained in a page.

# re: using the ASP.Net 3.5 ListView within a WebPart - Databinding methods such as Eval(), XPath(), and Bind() can only be used in controls contained in a page.

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