Display selected row value in ASP.Net DropDownList in footer on LinkButton Click using jQuery

Hi ramco1917,

Please refer below sample. 

Note: For this sample i have used temporary DataTable. For more details refer How to create Temporary Table in ASP.Net using C# and VB.Net.

HTML

<table id="tblCustomers">
    <thead>
        <tr>
            <th>Id</th>
            <th>Name</th>
            <th>Country</th>
            <th></th>
        </tr>
    </thead>
    <tbody>
        <asp:PlaceHolder ID="PlaceHolderTable" runat="server"></asp:PlaceHolder>
    </tbody>
    <tfoot>
        <tr>
            <td><asp:Label ID="lblId" runat="server" /></td>
            <td><asp:TextBox ID="txtName" runat="server" /></td>
            <td><asp:DropDownList ID="ddlCountries" runat="server">
                    <asp:ListItem Text="Select" Value="0" />
                    <asp:ListItem Text="United States" Value="United States" />
                    <asp:ListItem Text="India" Value="India" />
                    <asp:ListItem Text="France" Value="France" />
                    <asp:ListItem Text="Russia" Value="Russia" />
                </asp:DropDownList></td>
            <td></td>
        </tr>
    </tfoot>
</table>

<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<script type="text/javascript"> 
    $(function () {
        $('body').on('click', '[id*=btnEdit]', function () {
            var tr = $(this).closest('tr');
            var id = $(tr).find('td').eq(0).html();
            var name = $(tr).find('td').eq(1).html();
            var country = $(tr).find('td').eq(2).html();
            $('#lblId').html(id);
            $('#txtName').val(name);
            $('#ddlCountries').val(country);
        });
    });
</script>

Namespaces

C#

using System.Data;
using System.Text;

VB.Net

Imports System.Data
Imports System.Text

Code

C#

protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        DataTable dt = new DataTable();
        dt.Columns.AddRange(new DataColumn[3] {
                            new DataColumn("Id", typeof(int)),
                            new DataColumn("Name", typeof(string)),
                            new DataColumn("Country",typeof(string))
        });
        dt.Rows.Add(1, "John Hammond", "United States");
        dt.Rows.Add(2, "Mudassar Khan", "India");
        dt.Rows.Add(3, "Suzanne Mathews", "France");
        dt.Rows.Add(4, "Robert Schidner", "Russia");

        StringBuilder sb = new StringBuilder();
        foreach (DataRow dtRow in dt.Rows)
        {
            sb.Append("<tr>");
            sb.Append("<td>" + dtRow["Id"].ToString() + "</td>");
            sb.Append("<td>" + dtRow["Name"].ToString() + "</td>");
            sb.Append("<td>" + dtRow["Country"].ToString() + "</td>");
            sb.Append("<td><a href='#' id='btnEdit' style='cursor: pointer;'>Edit</a></td>");
            sb.Append("</tr>");
        }
        PlaceHolderTable.Controls.Add(new Literal { Text = sb.ToString() });
    }
}

VB.Net

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
    If Not Me.IsPostBack Then
        Dim dt As DataTable = New DataTable()
        dt.Columns.AddRange(New DataColumn(2) {New DataColumn("Id", GetType(Integer)), New DataColumn("Name", GetType(String)), New DataColumn("Country", GetType(String))})
        dt.Rows.Add(1, "John Hammond", "United States")
        dt.Rows.Add(2, "Mudassar Khan", "India")
        dt.Rows.Add(3, "Suzanne Mathews", "France")
        dt.Rows.Add(4, "Robert Schidner", "Russia")
        Dim sb As StringBuilder = New StringBuilder()

        For Each dtRow As DataRow In dt.Rows
            sb.Append("<tr>")
            sb.Append("<td>" & dtRow("Id").ToString() & "</td>")
            sb.Append("<td>" & dtRow("Name").ToString() & "</td>")
            sb.Append("<td>" & dtRow("Country").ToString() & "</td>")
            sb.Append("<td><a href='#' id='btnEdit' style='cursor: pointer;'>Edit</a></td>")
            sb.Append("</tr>")
        Next

        PlaceHolderTable.Controls.Add(New Literal With {
            .Text = sb.ToString()
        })
    End If
End Sub

Screenshot