iframe

Hi how to make this iframe play automatically (autoplay=true)?

<iframe width="560" height="455" id ="frame1" src="Reader.aspx?id=1" frameborder="0" allowfullscreen="1"></iframe>
this is the code from the separated file

<asp:DataList ID="DataList1" runat="server" DataSourceID="SqlDataSource1">
<ItemTemplate>
<iframe width="520" height="430"
src='<%# Eval("VideoUrl") %>' frameborder="0"></iframe>

</ItemTemplate>
</asp:DataList>
<asp:SqlDataSource ID="SqlDataSource1" runat="server"
ConnectionString="<%$ ConnectionStrings:ConnectionString %>"
SelectCommand="SELECT [Id], [VideoUrl] FROM [eyinda] WHERE ([Id] = @Id)">

<SelectParameters>
<asp:QueryStringParameter DefaultValue="1" Name="Id" QueryStringField="Id"
Type="Int32" />
</SelectParameters>
</asp:SqlDataSource>< ...