Hi  kuldevb,
Check this example. Now please take its reference and correct your code.
For creating the example i have taken references of the below articles.
Below is the database structure and inserted record.

HTML
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    <script type="text/javascript" src="http://maps.googleapis.com/maps/api/js?key=AIzaSyCgALQkf_VYw0hkBT-mp8qzUSNm0IBSClg"></script>
    <script type="text/javascript">    
    var markers = [
    <asp:Repeater ID="rptMarkers" runat="server">
    <ItemTemplate>
             {
                "title": '<%# Eval("Name") %>',
                "lat": '<%# Eval("Latitude") %>',
                "lng": '<%# Eval("Longitude") %>',
                "description": '<%# Eval("Description") %>'
            }
    </ItemTemplate>
    <SeparatorTemplate>
        ,
    </SeparatorTemplate>
    </asp:Repeater>
    ];
    </script>
    <script type="text/javascript">
        window.onload = function () {
            for (i = 0; i < markers.length; i++) {
                var mapOptions = {
                    center: new google.maps.LatLng(markers[0].lat, markers[0].lng),
                    zoom: 6,
                    mapTypeId: google.maps.MapTypeId.ROADMAP
                };
                var infoWindow = new google.maps.InfoWindow();
                var map = new google.maps.Map(document.getElementById("dvMap" + (i + 1)), mapOptions);
                var data = markers[i];
                var myLatlng = new google.maps.LatLng(data.lat, data.lng);
                var marker = new google.maps.Marker({
                    position: myLatlng,
                    map: map,
                    title: data.title
                });
                (function (marker, data) {
                    google.maps.event.addListener(marker, "click", function (e) {
                        infoWindow.setContent(data.description);
                        infoWindow.open(map, marker);
                    });
                })(marker, data);
            }
        }
    </script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:Repeater ID="rptMaps" runat="server">
            <ItemTemplate>
                <table>
                    <tr>
                        <td>
                            <div id='dvMap<%# Container.ItemIndex + 1 %>' style="width: 200px; height: 200px">
                            </div>
                        </td>
                        <td>
                            <a class="player" style="height: 200px; width: 200px; display: block" href='<%# Eval("Id", "FileCS.ashx?Id={0}") %>'>
                            </a>
                        </td>
                    </tr>
                </table>
            </ItemTemplate>
            <SeparatorTemplate>
                <hr />
            </SeparatorTemplate>
        </asp:Repeater>
    </div>
    <script src="FlowPlayer/flowplayer-3.2.12.min.js" type="text/javascript"></script>
    <script type="text/javascript">
    flowplayer("a.player", "FlowPlayer/flowplayer-3.2.16.swf", {
        plugins: {
            pseudo: { url: "FlowPlayer/flowplayer.pseudostreaming-3.2.12.swf" }
        },
        clip: { provider: 'pseudo', autoPlay: false},
    });
    </script>
    </form>
</body>
</html>
Namespaces
C#
using System.Data;
using System.Configuration;
using System.Data.SqlClient;
VB.Net
Imports System.Data
Imports System.Data.SqlClient
Code
C#
protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        DataTable dt = this.GetData("SELECT TOP 3 * FROM Locations");
        rptMarkers.DataSource = dt;
        rptMarkers.DataBind();
        rptMaps.DataSource = dt;
        rptMaps.DataBind();
    }
}
private DataTable GetData(string query)
{
    string conString = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
    SqlCommand cmd = new SqlCommand(query);
    using (SqlConnection con = new SqlConnection(conString))
    {
        using (SqlDataAdapter sda = new SqlDataAdapter())
        {
            cmd.Connection = con;
            sda.SelectCommand = cmd;
            using (DataTable dt = new DataTable())
            {
                sda.Fill(dt);
                return dt;
            }
        }
    }
}
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 = Me.GetData("SELECT TOP 3 * FROM Locations")
        rptMarkers.DataSource = dt
        rptMarkers.DataBind()
        rptMaps.DataSource = dt
        rptMaps.DataBind()
    End If
End Sub
Private Function GetData(ByVal query As String) As DataTable
    Dim conString As String = ConfigurationManager.ConnectionStrings("constr").ConnectionString
    Dim cmd As SqlCommand = New SqlCommand(query)
    Using con As SqlConnection = New SqlConnection(conString)
        Using sda As SqlDataAdapter = New SqlDataAdapter()
            cmd.Connection = con
            sda.SelectCommand = cmd
            Using dt As DataTable = New DataTable()
                sda.Fill(dt)
                Return dt
            End Using
        End Using
    End Using
End Function
Handler For Video streaming form Database
FileCS.ashx
<%@ WebHandler Language="C#" Class="FileCS" %>
using System;
using System.Web;
using System.Data.SqlClient;
using System.Configuration;
public class FileCS : IHttpHandler
{
    public void ProcessRequest(HttpContext context)
    {
        int id = int.Parse(context.Request.QueryString["id"]);
        byte[] bytes;
        string contentType;
        string strConnString = ConfigurationManager.ConnectionStrings["constr1"].ConnectionString;
        string name;
        using (SqlConnection con = new SqlConnection(strConnString))
        {
            using (SqlCommand cmd = new SqlCommand())
            {
                cmd.CommandText = "SELECT Name, Data, ContentType FROM tblFiles WHERE Id = @Id AND ContentType = 'video/mp4'";
                cmd.Parameters.AddWithValue("@Id", id);
                cmd.Connection = con;
                con.Open();
                SqlDataReader sdr = cmd.ExecuteReader();
                sdr.Read();
                bytes = (byte[])sdr["Data"];
                contentType = sdr["ContentType"].ToString();
                name = sdr["Name"].ToString();
                con.Close();
            }
        }
        context.Response.Clear();
        context.Response.Buffer = true;
        context.Response.AppendHeader("Content-Disposition", "attachment; filename=" + name);
        context.Response.ContentType = contentType;
        context.Response.BinaryWrite(bytes);
        context.Response.End();
    }
    public bool IsReusable
    {
        get
        {
            return false;
        }
    }
}
FileVB.ashx
<%@ WebHandler Language="VB" Class="FileVB" %>
Imports System
Imports System.Web
Imports System.Data.SqlClient
Public Class FileVB : Implements IHttpHandler
    
    Public Sub ProcessRequest(ByVal context As HttpContext) Implements IHttpHandler.ProcessRequest
        Dim id As Integer = Integer.Parse(context.Request.QueryString("id"))
        Dim bytes As Byte()
        Dim contentType As String
        Dim strConnString As String = ConfigurationManager.ConnectionStrings("constr1").ConnectionString
        Dim name As String
        Using con As SqlConnection = New SqlConnection(strConnString)
            Using cmd As SqlCommand = New SqlCommand()
                cmd.CommandText = "SELECT Name, Data, ContentType FROM tblFiles WHERE Id = @Id AND ContentType = 'video/mp4'"
                cmd.Parameters.AddWithValue("@Id", id)
                cmd.Connection = con
                con.Open()
                Dim sdr As SqlDataReader = cmd.ExecuteReader()
                sdr.Read()
                bytes = CType(sdr("Data"), Byte())
                contentType = sdr("ContentType").ToString()
                name = sdr("Name").ToString()
                con.Close()
            End Using
        End Using
        context.Response.Clear()
        context.Response.Buffer = True
        context.Response.AppendHeader("Content-Disposition", "attachment; filename=" & name)
        context.Response.ContentType = contentType
        context.Response.BinaryWrite(bytes)
        context.Response.[End]()
    End Sub
 
    Public ReadOnly Property IsReusable() As Boolean Implements IHttpHandler.IsReusable
        Get
            Return False
        End Get
    End Property
End Class
Screenshot
