<asp:Repeater ID="Repeater1" runat="server"> <ItemTemplate> <%# ((KeyValuePair<int, List<User>>)Container.DataItem).Key %> <br /> <asp:Repeater ID="Repeater2" runat="server" DataSource='<%# ((KeyValuePair<int, List<User>>)Container.DataItem).Value %>'> <ItemTemplate> <%# (Container.DataItem as User).Id %> <%# (Container.DataItem as User).Name %> </ItemTemplate> </asp:Repeater> <hr /> </ItemTemplate> </asp:Repeater>

public partial class Temp : System.Web.UI.Page { Dictionary<int, List<User>> dict = new Dictionary<int, List<User>>(); protected void Page_Load(object sender, EventArgs e) { dict.Add(1, new List<User> { new User{Id = 1, Name = "aa"} ,new User{Id = 2, Name = "bb"} }); dict.Add(2, new List<User> { new User{Id = 3, Name = "cc"} ,new User{Id = 4, Name = "dd"} }); Repeater1.DataSource = dict; Repeater1.DataBind(); } } public class User { public int Id{get;set;} public string Name{get;set;} }