ASP.Net Play MP4 Videos in one single player

I have modified the same sample code,

I have removed player out of DataList and added buttons

 When the Button is clicked Video is player

    <form id="form1" runat="server">
    <asp:FileUpload ID="FileUpload1" runat="server" />
    <asp:Button ID="btnUpload" runat="server" Text="Upload" OnClick="btnUpload_Click" />
    <hr />
    <asp:DataList ID="DataList1" Visible="true" runat="server" AutoGenerateColumns="false"
        RepeatColumns="2" CellSpacing="5">
        <ItemTemplate>
            <u>
                <%# Eval("Name") %></u>
            <hr />
            <asp:Button Text='<%# Eval("Name") %>' runat="server" CommandArgument = '<%# Eval("Id") %>' OnClick = "PlayVideo" />
        </ItemTemplate>
    </asp:DataList>
    <br />
    <a runat = "server" id = "player" class="player" style="height: 300px; width: 300px; display: block">
      </a>
        <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: true},
    });
        </script>
    </form>

    protected void PlayVideo(object sender, EventArgs e)
    {
        player.HRef = string.Format("FileCS.ashx?Id={0}", (sender as Button).CommandArgument);
    }