HTML

<ASPNetAudio:Audio ID="MediaPlayer" AutoPlay="true" runat="server" Volume="50"></ASPNetAudio:Audio>
<asp:Panel ID="Panel1" runat="server"></asp:Panel>

<ASPNetMediaGUI:PlayList ID="PlayList" runat="server" width="96%"
MediaPlayer="MediaPlayer" ShowHeader="False" AutoGenerateColumns="False" PlayState="Play" SelectedTrack="1"
ontrackchangeevent="PlayList_TrackChangeEvent" DataSourceID="ObjectDataSource1"
onrowdatabound="PlayList_RowDataBound" LoopPlayList="True"
ondatabound="PlayList_DataBound">
<SelectedRowStyle BackColor="#bb17ff" />
<AlternatingRowStyle BackColor="#BFBFBF" />
<Columns>
<asp:TemplateField ShowHeader="False">
<ItemTemplate>
<asp:LinkButton CssClass="FonteTela" ID="TrackSelectButton" runat="server"
CausesValidation="False"
CommandName="Select"
Text='<%# Eval("artist") +" - "+ Eval("name") %>'
CommandArgument='<%# Eval("url") %>'
OnCommand="HandleClick">
</asp:LinkButton>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</ASPNetMediaGUI:PlayList>

Points of consideration:

• If ASPNetMediaGUI:PlayList inherits from aspnet GridView, the expected way of bind this control should be setting the datasource and calling databind() method:
PlayList.DataSource = MyClass.MyDataTableMethod;
PlayList.DataBind();
• We expect to do this just if not page is postback. The ViewState property of the gridview should serialize the databound information.
• Is very important not call the databind method every time the page post back. That’s the problem!

The way I put it running:

• I call the DataBind() method on the Page Load.
• The only way it works is when I call this method outside of the if(!Page.IsPostBack) setence making a trip to the database everysingle click on the page, etc.

void DataBind()
{
if (pkArtist != null)
{
ObjectDataSource ObjectDataSource1 = new ObjectDataSource();
ObjectDataSource1.ID = "ObjectDataSource1";
ObjectDataSource1.TypeName = "business.Player";
ObjectDataSource1.SelectMethod = "ListenByArtist";
ObjectDataSource1.SelectParameters.Add(new Parameter("pkArtist", TypeCode.Int32, pkArtist));

this.Panel1.Controls.Add(ObjectDataSource1);
}
else
{
PlayList.PlayListTracks.Clear();

ASPNetMediaGUI.PlayListTrack track = new ASPNetMediaGUI.PlayListTrack();
track.Name = "a";
track.URL = "b";

PlayList.PlayListTracks.Add(track);
PlayList.DataSourceID = "";
PlayList.Columns.Clear();
}
}

The necessities:

• NOT use ObjectDataSource component to bind data to the Playlist.
• Use the Playlist component pretty much like an usual GridView, calling DataSource property and DataBind method.
• The ViewState of the Playlist component MUST work as an usual GridView.