why modelpopup is appearing after being hidden of targetcontrolid(button)

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<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="ajaxToolkit" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server">

<asp:Button ID="show_popup" runat="server" Text="Show popup" />
<asp:Label ID="Label1" runat="server">

<ajaxToolkit:ModalPopupExtender ID="mpe" runat="server" TargetControlID="show_popup" PopupControlID="Panel1">
<asp:Panel ID="Panel1" runat="server">
<asp:TextBox ID="TextBox1" runat="server">

<asp:Button ID="Button1" runat="server" Text="Button"
onclick="Button1_Click1" />

</form>
</body>
</html>

C#

protected void Button1_Click1(object sender, EventArgs e)
    {
        show_popup.Visible = false;
        Label1.Text = TextBox1.Text;
        mpe.Hide();
    }

Posted 20-Jun-13 7:34am

naresh naik @ india

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sjelen · Answer 1 · 2013-06-21T02:50:00

When you use:

C#

show_popup.Visible = false;

you're not just hiding button, it will not be rendered at all. That will cause client side error because extender will not be able to find target control.

Instead try hiding the button with something like this:

C#

show_popup.Style.Add("display", "none");

KuttiSankar · Answer 2 · 2013-06-20T23:34:00

Solution 1

simillar Question...

How to show ModalPopUpExtender in Page Load?[^]

Posted 20-Jun-13 23:34pm

KuttiSankar

Comments

Rajesh Anuhya 21-Jun-13 5:55am

This is not an answer, you have to post it as a comment not a soluation.
--RA