Hi makumbi,

Check this example. Now please take its reference and correct your code.

Using the below article i have created the example.

Search and Filter GridView as you type in TextBox using jQuery AJAX in ASP.Net

DataBase

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

Download SQL file

SQL

CREATE PROCEDURE [dbo].[Files_GetFiles_Pager]
       @SearchTerm VARCHAR(100) = ''
      ,@PageIndex INT = 1
      ,@PageSize INT = 10
      ,@RecordCount INT OUTPUT
AS
BEGIN
      SET NOCOUNT ON;
      SELECT ROW_NUMBER() OVER
      (
            ORDER BY [Id] ASC
      )AS RowNumber
      ,[Name]
      ,[Id]
      ,[Data]
      INTO #Results
      FROM tblFiles
      WHERE [Name] LIKE @SearchTerm + '%' OR @SearchTerm = ''
      SELECT @RecordCount = COUNT(*)
      FROM #Results
          
      SELECT * FROM #Results
      WHERE RowNumber BETWEEN(@PageIndex -1) * @PageSize + 1 AND(((@PageIndex -1) * @PageSize + 1) + @PageSize) - 1
    
      DROP TABLE #Results
END

HTML

Search:<asp:TextBox ID="txtSearch" runat="server" />
<hr />
<asp:GridView ID="gvFiles" runat="server" AutoGenerateColumns="false">
    <Columns>
        <asp:BoundField DataField="Id" HeaderText="Id" />
        <asp:BoundField DataField="Name" HeaderText="Name" ItemStyle-CssClass="Name" />
        <asp:ImageField DataImageUrlField="Data" HeaderText="Photo" />
        <asp:ButtonField CommandName="Select" HeaderText="Select" Text="Select" />
    </Columns>
</asp:GridView>
<br />
<div class="Pager"></div>
<hr />
<asp:Image ID="Image1" runat="server" Height="70px" Width="86px" />
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<script src="ASPSnippets_Pager.min.js" type="text/javascript"></script>
<script type="text/javascript">
    $(function () {
        GetCustomers(1);
        $("body").on("keyup", "[id*=txtSearch]", function () {
            GetCustomers(parseInt(1));
        });
        $("body").on("click", ".Pager .page", function () {
            GetCustomers(parseInt($(this).attr('page')));
        });
    });
    function SearchTerm() {
        return jQuery.trim($("[id*=txtSearch]").val());
    };
    function GetCustomers(pageIndex) {
        $.ajax({
            type: "POST",
            url: "Default.aspx/GetFiles",
            data: '{searchTerm: "' + SearchTerm() + '", pageIndex: ' + pageIndex + '}',
            contentType: "application/json; charset=utf-8",
            dataType: "json",
            success: OnSuccess,
            failure: function (response) {
                alert(response.d);
            },
            error: function (response) {
                alert(response.responseText);
            }
        });
    }
    var row;
    function OnSuccess(response) {
        var xmlDoc = $.parseXML(response.d);
        var xml = $(xmlDoc);
        var files = xml.find("Files");
        if (row == null) {
            row = $("[id*=gvFiles] tr:last-child").clone(true);
        }
        $("[id*=gvFiles] tr").not($("[id*=gvFiles] tr:first-child")).remove();
        if (files.length > 0) {
            $.each(files, function () {
                var employee = $(this);
                $("td", row).eq(0).html($(this).find("Id").text());
                $("td", row).eq(1).html($(this).find("Name").text());
                $("td", row).eq(2).html("<img class='imgData' src='" + $(this).find("Image").text() + "' alt='" + $(this).find("Name").text() + "' height='100px' width='100px' />");
                $("td", row).eq(3).html("<a href='javascript:;' onclick='GetData(this)'>Select</a>");
                $("[id*=gvFiles]").append(row);
                row = $("[id*=gvFiles] tr:last-child").clone(true);
            });
            var pager = xml.find("Pager");
            $(".Pager").ASPSnippets_Pager({
                ActiveCssClass: "current",
                PagerCssClass: "pager",
                PageIndex: parseInt(pager.find("PageIndex").text()),
                PageSize: parseInt(pager.find("PageSize").text()),
                RecordCount: parseInt(pager.find("RecordCount").text())
            });

            $(".Name").each(function () {
                var searchPattern = new RegExp('(' + SearchTerm() + ')', 'ig');
                $(this).html($(this).text().replace(searchPattern, "<span class = 'highlight'>" + SearchTerm() + "</span>"));
            });
        } 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.");
            $("td", empty_row).not($("td:first-child", empty_row)).remove();
            $("[id*=gvFiles]").append(empty_row);
        }
    };

    function GetData(ele) {
        var row = $(ele).closest('tr');
        $("[id*=Image1]").attr('src', $("td", row).find('.imgData').attr('src'));
    };
</script>

Namespaces

C#

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

VB.Net

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

Code

C#

private static int PageSize = 2;
protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        BindDummyRow();
    }
}

private void BindDummyRow()
{
    DataTable dummy = new DataTable();
    dummy.Columns.Add("Id");
    dummy.Columns.Add("Name");
    dummy.Columns.Add("Data");
    dummy.Rows.Add();
    gvFiles.DataSource = dummy;
    gvFiles.DataBind();
}

[WebMethod]
public static string GetFiles(string searchTerm, int pageIndex)
{
    string query = "[Files_GetFiles_Pager]";
    SqlCommand cmd = new SqlCommand(query);
    cmd.CommandType = CommandType.StoredProcedure;
    cmd.Parameters.AddWithValue("@SearchTerm", searchTerm);
    cmd.Parameters.AddWithValue("@PageIndex", pageIndex);
    cmd.Parameters.AddWithValue("@PageSize", PageSize);
    cmd.Parameters.Add("@RecordCount", SqlDbType.Int, 4).Direction = ParameterDirection.Output;
    return GetData(cmd, pageIndex).GetXml();
}

private static DataSet GetData(SqlCommand cmd, int pageIndex)
{
    string strConnString = ConfigurationManager.ConnectionStrings["constr"].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, "Files");
                DataTable dt = new DataTable("Pager");
                dt.Columns.Add("PageIndex");
                dt.Columns.Add("PageSize");
                dt.Columns.Add("RecordCount");
                dt.Rows.Add();
                dt.Rows[0]["PageIndex"] = pageIndex;
                dt.Rows[0]["PageSize"] = PageSize;
                dt.Rows[0]["RecordCount"] = cmd.Parameters["@RecordCount"].Value;
                ds.Tables["Files"].Columns.Add("Image");
                for (int i = 0; i < ds.Tables["Files"].Rows.Count; i++)
                {
                    byte[] imgBytes = (byte[])ds.Tables["Files"].Rows[i]["Data"];
                    string base64String = Convert.ToBase64String(imgBytes, 0, imgBytes.Length);
                    ds.Tables["Files"].Rows[i]["Image"] = "data:image/png;base64," + base64String;
                }
                ds.Tables.Add(dt);
                return ds;
            }
        }
    }
}

VB.Net

Private Shared PageSize As Integer = 2

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

Private Sub BindDummyRow()
    Dim dummy As DataTable = New DataTable()
    dummy.Columns.Add("Id")
    dummy.Columns.Add("Name")
    dummy.Columns.Add("Data")
    dummy.Rows.Add()
    gvFiles.DataSource = dummy
    gvFiles.DataBind()
End Sub

<WebMethod()>
Public Shared Function GetFiles(ByVal searchTerm As String, ByVal pageIndex As Integer) As String
    Dim query As String = "[Files_GetFiles_Pager]"
    Dim cmd As SqlCommand = New SqlCommand(query)
    cmd.CommandType = CommandType.StoredProcedure
    cmd.Parameters.AddWithValue("@SearchTerm", searchTerm)
    cmd.Parameters.AddWithValue("@PageIndex", pageIndex)
    cmd.Parameters.AddWithValue("@PageSize", PageSize)
    cmd.Parameters.Add("@RecordCount", SqlDbType.Int, 4).Direction = ParameterDirection.Output
    Return GetData(cmd, pageIndex).GetXml()
End Function

Private Shared Function GetData(ByVal cmd As SqlCommand, ByVal pageIndex As Integer) As DataSet
    Dim strConnString As String = ConfigurationManager.ConnectionStrings("constr").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, "Files")
                Dim dt As DataTable = New DataTable("Pager")
                dt.Columns.Add("PageIndex")
                dt.Columns.Add("PageSize")
                dt.Columns.Add("RecordCount")
                dt.Rows.Add()
                dt.Rows(0)("PageIndex") = pageIndex
                dt.Rows(0)("PageSize") = PageSize
                dt.Rows(0)("RecordCount") = cmd.Parameters("@RecordCount").Value
                ds.Tables("Files").Columns.Add("Image")
                For i As Integer = 0 To ds.Tables("Files").Rows.Count - 1
                    Dim imgBytes As Byte() = CType(ds.Tables("Files").Rows(i)("Data"), Byte())
                    Dim base64String As String = Convert.ToBase64String(imgBytes, 0, imgBytes.Length)
                    ds.Tables("Files").Rows(i)("Image") = "data:image/png;base64," & base64String
                Next

                ds.Tables.Add(dt)
                Return ds
            End Using
        End Using
    End Using
End Function

Screenshot