Button inside datalist , ASP.NET

Question

1.00/5 (1 vote)

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In my web application I have ( FAQ) page, which contains retrieved Questions and Answers from the database using "datalist" , I want The Answers display when click on Show-More Button.

C#

<asp:DataList ID="DataList1" runat="server" Width="595px" OnSelectedIndexChanged="DataList1_SelectedIndexChanged1"  >
                                      <ItemTemplate>

                                          Q:
                                          <asp:Label ID="QuestionLabel" runat="server" CssClass="labelcolor" Text='<%# Eval("Question") %>' />
                                          <br/>
                                          <asp:Button ID="Button3" runat="server" Text="Show_More" onclick=" Button3_Click" />
                                          A:
                                          <asp:Label ID="AnswerLabel" runat="server" Text='<%# Eval("Answer") %>'  Visible="false"/>
                                          <br />

                                      </ItemTemplate>
                                  </asp:DataList>                                   </asp:DataList>

code behind:

C#

protected void Button3_Click(object sender, EventArgs e)
{

    AnswerLabel.visble = true;


}

What I have tried:

I tried to add button that display the Answer but I got this error

Error CS0103 The name 'AnswerLabel' does not exist in the current context

Posted 11-Apr-16 5:33am

Member 12451924

Updated 11-Apr-16 6:38am

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Richard Deeming · Accepted Answer · 2016-04-11T06:38:00

Solution 1

Of course it doesn't exist - your list will contain multiple controls called AnswerLabel, and the compiler has no way of knowing which AnswerLabel control you want to change.

You need to use FindControl to find the specific AnswerLabel control within the list:

C#

protected void Button3_Click(object sender, EventArgs e)
{
    var button = (Control)sender;
    var answerLabel = button.NamingContainer.FindControl("AnswerLabel");
    if (answerLabel != null)
    {
        answerLabel.Visible = true;
        button.Visible = false;
    }
}

Posted 11-Apr-16 6:38am

Richard Deeming

Comments

Member 12451924 11-Apr-16 12:56pm

I got this error when I click on button :

Invalid postback or callback argument. Event validation is enabled using <pages enableEventValidation="true"/> in configuration or <%@ Page EnableEventValidation="true" %> in a page. For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them. If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation.

Richard Deeming 11-Apr-16 13:01pm

Then there's something wrong with the way you're binding your data.

Member 12451924 11-Apr-16 13:10pm

I changed it to
<asp:Button ID="Button3" runat="server" Text="Button" onclick="Button3_Click" CausesValidation="True" UseSubmitBehavior="False" />
and it is working , Thanks a lot