Hi Alex,

I've posted my followup in your previous thread in the aspnet newsgroup:

"Design-Time UserControl Property Setting"

As for the new problem you mentioned here, I think it depend on how to
implement the custom property, are you storing the property data into a
shared place that multiple usercontrols instances could overwrite it? For
exapmle, if you use a static varitable , then all the control instance may
share the same variable instance.  Anyway, for your convenience, I'll paste
my test usercontrol(modified one according to your another thread) here,
you can have a test against it to see whether it works(based on my local
test it works well):

=======ascx=============
<asp:Label ID="lblCategories" runat="server" Text="Categories:
"></asp:Label>
<asp:DropDownList ID="lstCategories" runat="server"
OnSelectedIndexChanged="lstCategories_SelectedIndexChanged">
</asp:DropDownList>

==========code behind==========
public partial class UserControls_ddl_ListUC : System.Web.UI.UserControl
{

   private int _count;

   public int Count
   {
       get { return _count; }
       set { _count = value; }
   }

   public string SelectedValue
   {
       get { return ViewState["_selectedvalue"] as string; }
       set
       {
           ViewState["_selectedvalue"] = value;
       }
   }

 

   protected void Page_Load(object sender, EventArgs e)
   {

     
       if (!IsPostBack)
       {
           string sql = "select TOP {0} CategoryID, CategoryName from
Categories";

           SqlConnection conn = new
SqlConnection(WebConfigurationManager.ConnectionStrings["LocalNorthwindConnS
tr"].ConnectionString);

           conn.Open();

           SqlCommand comm = new SqlCommand(string.Format(sql, _count),
conn);
           SqlDataReader reader =
comm.ExecuteReader(CommandBehavior.CloseConnection);

           lstCategories.DataSource = reader;
           lstCategories.DataTextField = "CategoryName";
           lstCategories.DataValueField = "CategoryName";

           lstCategories.DataBind();

           reader.Close();

         
       }

   }

   protected void Page_PreRender(object sender, EventArgs e)
   {
       lstCategories.SelectedValue = SelectedValue;

   }

   protected void lstCategories_SelectedIndexChanged(object sender,
EventArgs e)
   {
       SelectedValue = lstCategories.SelectedValue;
   }
}
======================

Hope this helps.

Regards,

Steven Cheng
Microsoft Online Community Support

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