Hi rani,

Refer below sample.

Database

For this sample I have used of NorthWind database that you can download using the link given below.

Download Northwind Database

SQL

CREATE PROCEDURE [dbo].[GetCustomers_ByContactName]
       @SearchTerm VARCHAR(100) = ''
AS
BEGIN
      SET NOCOUNT ON;
      SELECT TOP 5 [CustomerID]
      ,[CompanyName]
      ,[ContactName]
      ,[City]
      FROM [Customers]
      WHERE [ContactName] LIKE @SearchTerm + '%' OR @SearchTerm = ''
END

HTML

<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<script type="text/javascript">
    $(function () {
        GetCustomers();
    });

    $("[id*=txtSearch]").live("keyup", function () {
        GetCustomers();
    });

    function SearchTerm() {
        return jQuery.trim($("[id*=txtSearch]").val());
    };

    function GetCustomers() {
        $.ajax({
            type: "POST",
            url: "Default.aspx/GetCustomers",
            data: '{searchTerm: "' + SearchTerm() + '"}',
            contentType: "application/json; charset=utf-8",
            dataType: "json",
            success: OnSuccess,
            failure: function (response) {
                alert(response.d);
            },
            error: function (response) {
                alert(response.d);
            }
        });
    }
    var row;
    function OnSuccess(response) {
        var xmlDoc = $.parseXML(response.d);
        var xml = $(xmlDoc);
        var customers = xml.find("Customers");
        if (row == null) {
            row = $("#dvCustomers table").eq(0).clone(true);
        }
        $("#dvCustomers").empty();
        if (customers.length > 0) {
            customers.each(function () {
                var customer = $(this);
                $(".CustomerID", row).html(customer.find("CustomerID").text());
                $(".ContactName", row).html(customer.find("ContactName").text());
                $(".City", row).html(customer.find("City").text());
                $("#dvCustomers").append(row).append("<br />");
                row = $("#dvCustomers table").eq(0).clone(true);
            });
        }
        else {
            var empty_row = row.clone(true);
            $("td:first-child", empty_row).attr("colspan", $("td", row).length);
            $("td:first-child", empty_row).attr("align", "center");
            $("td:first-child", empty_row).html("No records found for the search criteria.");
            $("tr", empty_row).not($("tr:first-child", empty_row)).remove();
            $("[id*=dvCustomers]").append(empty_row);
        }
    }
</script>
Search:
<asp:TextBox ID="txtSearch" runat="server" /><hr />
<div id="dvCustomers">
    <asp:DataList runat="server" ID="dlCustomers">
        <ItemTemplate>
            <table class="tblCustomer" cellpadding="2" cellspacing="0" border="1">
                <tr>
                    <td>
                        <b><u><span class="CustomerID">
                            <%# Eval("CustomerID")%></span></u></b>
                    </td>
                </tr>
                <tr>
                    <td>
                        <b>ContactName: </b><span class="ContactName" style="background-color: Red">
                            <%# Eval("ContactName")%></span><br />
                        <b>City: </b><span class="City">
                            <%# Eval("City")%></span><br />
                    </td>
                </tr>
            </table>
        </ItemTemplate>
    </asp:DataList>
</div>

Namespaces

C#

using System.Data;
using System.Web.Services;
using System.Configuration;
using System.Data.SqlClient;

VB.Net

Imports System.Data
Imports System.Web.Services
Imports System.Configuration
Imports System.Data.SqlClient

Code

C#

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        BindDummyRow();
    }
}

private void BindDummyRow()
{
    DataTable dummy = new DataTable();
    dummy.Columns.Add("CustomerID");
    dummy.Columns.Add("ContactName");
    dummy.Columns.Add("City");
    dummy.Rows.Add();
    dlCustomers.DataSource = dummy;
    dlCustomers.DataBind();
}

[WebMethod]
public static string GetCustomers(string searchTerm)
{
    string query = "[GetCustomers_ByContactName]";
    SqlCommand cmd = new SqlCommand(query);
    cmd.CommandType = CommandType.StoredProcedure;
    cmd.Parameters.AddWithValue("@SearchTerm", searchTerm);
    return GetData(cmd).GetXml();
}

private static DataSet GetData(SqlCommand cmd)
{
    string strConnString = ConfigurationManager.ConnectionStrings["conString"].ConnectionString;
    using (SqlConnection con = new SqlConnection(strConnString))
    {
        using (SqlDataAdapter sda = new SqlDataAdapter())
        {
            cmd.Connection = con;
            sda.SelectCommand = cmd;
            using (DataSet ds = new DataSet())
            {
                sda.Fill(ds, "Customers");
                return ds;
            }
        }
    }
}

VB.Net

 Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)Handle Me.Load
        If Not IsPostBack Then
            BindDummyRow()
        End If
    End Sub

    Private Sub BindDummyRow()
        Dim dummy As DataTable = New DataTable()
        dummy.Columns.Add("CustomerID")
        dummy.Columns.Add("ContactName")
        dummy.Columns.Add("City")
        dummy.Rows.Add()
        dlCustomers.DataSource = dummy
        dlCustomers.DataBind()
    End Sub

    <WebMethod>
    Public Shared Function GetCustomers(ByVal searchTerm As String) As String
        Dim query As String = "[GetCustomers_ByContactName]"
        Dim cmd As SqlCommand = New SqlCommand(query)
        cmd.CommandType = CommandType.StoredProcedure
        cmd.Parameters.AddWithValue("@SearchTerm", searchTerm)
        Return GetData(cmd).GetXml()
    End Function

    Private Shared Function GetData(ByVal cmd As SqlCommand) As DataSet
        Dim strConnString As String = ConfigurationManager.ConnectionStrings("conString").ConnectionString
        Using con As SqlConnection = New SqlConnection(strConnString)
            Using sda As SqlDataAdapter = New SqlDataAdapter()
                cmd.Connection = con
                sda.SelectCommand = cmd

                Using ds As DataSet = New DataSet()
                    sda.Fill(ds, "Customers")
                    Return ds
                End Using
            End Using
        End Using
    End Function

Screenshot