<% For i = 0 To 10%>
<%Html.RenderPartial("MyUserControl", i)%>
<% Next%>
The RenderPartial method has an overload that allows you to pass in a (sub) model. To use it most effectively, your UserControl must be strongly typed - in this case, to a model of type System.Int32.
To use it in a UserControl:
<%@ Control Language="C#"
Inherits="System.Web.Mvc.ViewUserControl<System.Int32>" %>
<div><%= this.Html.Encode(this.Model) %></div>
In this case, it this.Modelis an instance of System.Int32.