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<asp:GridView ID="GridView2" runat="server" AutoGenerateColumns ="false" DataKeyNames ="mail_id">
<Columns >
<asp:TemplateField HeaderText ="Sent to.." HeaderStyle-BackColor ="#666666">
<ItemTemplate >
<asp:LinkButton ID="LinkName" Text='<%#Eval("vend_name") %>' runat = "server"></asp:LinkButton>

    <div id ="popupDiv" style ="height :100; width :300; display :none">
    <asp:TextBox ID="TextBox3" runat="server" TextMode ="MultiLine" Text ='<%#Bind("mail_msg") %>'></asp:TextBox>
    <input id="Button1" type="button" value="button" />

<asp:ModalPopupExtender ID="Model1" runat="server" PopupControlID ="popupDiv" TargetControlID ="LinkName">

I have enclosed a ModelPopup and Popupwindow within <itemtemplate> of a Gridview.
For each row of vendor name in the Gridview I need to get corresponding Vendor_message in the popup window. But in the above code for all the row it is displaying Vendor_message of the first row. How can I get corresponding item in client-side.

Here are couple of articles showing a modulpopup on click of a link button in a gridview. A full step-by-step implementation, look at them:
Display Master-Detail Data with the ModalPopup Extender and GridView[^]
Confirm GridView Deletes with the ModalPopupExtender[^]
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SHAJANCHERIAN 23-Apr-11 3:51am    
Hi Sandeep,
In the tutorial they are using two seperate query (ie One to bind the data to the Main-Gridview & Second to bind the data to child-gridview in the popup). I can resolve my problem in the same way . But it slightly effect performance. Because a post-back is occuring(ie. to execute the Child-detail-query)

In my case all the details are available in one query(ie.vendor_name and message).Vendor_names are displaying as linkButton in Gridview. when user click on the vendor name Message should display using Model-popup without postback. Can you modify you answer to meet my requirement.
The solution I am providing here is working perfectly.
To get the details in the Popup I am performing a search in the dataset.
Can any one give much improved answer to avaoid this searching.
so that performance can be improved.
<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="_Default" %>
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "">

<html xmlns="">
<head runat="server">
    <title>GridView With ModalPopUpExtender</title>
<style type="text/css">
        font: normal 12px auto "Trebuchet MS", Verdana;
        background-color: #ffffff;
        color: #4f6b72;

        font: normal 11px auto "Trebuchet MS", Verdana;
        background-color: #ffffff;
        color: #4f6b72;
        filter: alpha(opacity=80);
        opacity: 0.8;

         background-color: #dddddd;
         cursor: move;
         border:solid 1px gray ;

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

<cc1:ToolkitScriptManager id="akt1" runat="server"> </cc1:ToolkitScriptManager>
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<asp:GridView ID="GridView2" runat="server" AutoGenerateColumns ="false" DataKeyNames ="mail_id">
        <Columns >
        <asp:TemplateField HeaderText="CustomerID">
        <asp:LinkButton runat="server" ID="LinkButton1" Text='<%# Eval("mail_id") %>' OnClick="lnkCustDetails_Click" />
        <asp:TextBox ID="hiddenTxt" runat="server" Text='<%# Eval("mail_msg") %>' TextMode ="MultiLine" Visible ="false"></asp:TextBox>

<asp:Button runat="server" ID="btnShowModalPopup" style="display:none"/>
<div id ="popupDiv" style ="height :100; width :300; display :none">
    <asp:Panel runat="Server" ID="panelDragHandle" CssClass="drag"> Hold here to Drag this Box</asp:Panel>
    <asp:TextBox ID="TextBox3" runat="server" TextMode ="MultiLine"></asp:TextBox> <br />
    <asp:Button ID="btnClose" runat="server" Text="Close" />

<cc1:ModalPopupExtender ID="ModalPopupExtender1" runat="server"
    CancelControlID ="btnClose"/>



public partial class _Default : System.Web.UI.Page
DataSet ds, DS_ViewState;
SqlDataAdapter da;

protected void Page_Load(object sender, EventArgs e)
string constr = System.Web.Configuration.WebConfigurationManager.
string sql = "SELECT *FROM tbl_Message";
SqlConnection connection = new SqlConnection(constr);
SqlCommand cmd = new SqlCommand(sql, connection);
cmd.CommandType = CommandType.Text;

ds = new DataSet();
DS_ViewState = new DataSet();
da = new SqlDataAdapter();
da.SelectCommand = cmd;

da.MissingSchemaAction = MissingSchemaAction.AddWithKey;
da.Fill(ds, "tbl_Message");
da.Fill(DS_ViewState, "tbl_Message1");

GridView2.DataSource = ds.Tables ["tbl_Message"];
ViewState["keyds"] = ds;
protected void lnkCustDetails_Click(object sender, EventArgs e)
LinkButton lb = sender as LinkButton;
string usrID = lb.Text.ToString();
DS_ViewState = (DataSet)ViewState["keyds"];
DataRow dr = DS_ViewState.Tables[0].NewRow();
dr = DS_ViewState.Tables[0].Rows.Find(usrID);
TextBox3.Text = dr[4].ToString();
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