Unable to Create Event Handler for a LinkButton inside a ListView ItemTemplate

Question

This is a weird issue. I have a List view with 2 Link buttons. "Edit" and "Delete" Iam able to attach an event handler for the first linkbutton(Update). Code in the event handler executed fine. But If I try to attach a event handler for the second link button(Delete) , I get an error.

My Item Template Looks like this.

<ItemTemplate>
                    <tr>
                        <td>
                            <asp:Label ID="MessageLabel" runat="server" Text='<%# Eval("Item") %>' />
                        </td>
                        <td>
                            <asp:Label ID="URLLabel" runat="server" Text='<%# Eval("URL") %>' />
                        </td>
                        <td>
                            <asp:LinkButton ID="EditLinkButton" runat="server" OnClick="EditLinkButtonClicked"
                                CommandArgument='<%# Eval("ItemID") %>'> Edit</asp:LinkButton>
                        </td>
                        <td>
                            <asp:LinkButton ID="DeleteLinkButton" runat="server" OnClick="DeleteLinkButtonClicked"
                                CommandArgument='<%# Eval("ItemID") %>'>Delete</asp:LinkButton>
                        </td>
                    </tr>
                </ItemTemplate>

The Event handler declared in the codebehind file are

public void EditLinkButtonClicked(object sender, EventArgs e) { ----- }

public void DeleteLinkButtonClicked(object sender, EventArgs e) { ----- } [Exactly same]

First Item works absolutely fine. But If I attach the second handler, I get the following error enter image description here

Am I missing some thing ? Note - There is no error if I try to attach the 1st event handler to the second link button.[ie EditLinkButtonClicked to DeleteLinkButtonClicked ] Issue occurs only when I try to attach DeleteLinkButtonClicked to DeleteLinkButton

Any help? Thanks in Advance

apros apros · Accepted Answer · 2011-02-01T13:49:47

Try to disable EnableEventValidation for the Page directive and check it.

<%@ Page EnableEventValidation="false" %>

If it help then you should to know that:

This feature reduces the risk of unauthorized or malicious postback requests and callbacks. It is strongly recommended that you do not disable event validation.

regarding to http://msdn.microsoft.com/en-us/library/system.web.ui.page.enableeventvalidation.aspx and try to avoid this in the way that was suggested here.

Unable to Create Event Handler for a LinkButton inside a ListView ItemTemplate

3 Answers