Web User Control Causing Page Not Found

Question

I came across a pretty weird issue. Some of my Web User Controls are causing the parent page which references it to get 404 page not found error.

Here is how I register it on the .aspx page:

<%@ Register TagPrefix="uc" TagName="DonationList"
Src="~/Controls/Donation/DonationList.ascx" %>

And the line where the user control is declared on the same aspx page:

<uc:DonationList ID="seenDonationListUC" runat="server" SeenInformation="Seen" />

If I remove the above line, I don't get a 404 error page anymore.

This is a small snippet of the user control class:

public partial class DonationList : System.Web.UI.UserControl
{
    public enum Seen
    {
        Unspecified = 0,
        Seen = 1,
        NotSeen = 2
    }
    public Seen SeenInformation
    {
        get
        {
            int temp = seenInformationHF.Value == "" ? 0 : Convert.ToInt32(seenInformationHF.Value);
            result = (Seen) temp;
            return result;
        }
        .....

Any idea on the possible causes of this?

Answer 1

Name of your enum and subsequent enum value both are same "Seen". Try changing the enum name to something like SeenOptions. For example,

public enum SeenOptions
{
    Unspecified = 0,
    Seen = 1,
    NotSeen = 2
}

In this case your SeenInformation class will look like,

public SeenOptions SeenInformation
{
    get
    {
        int temp = seenInformationHF.Value == "" ? 0 : Convert.ToInt32(seenInformationHF.Value);
        result = (Seen) temp;
    }
    .....

And finally, your user control line on aspx page will be same as before.

<uc:DonationList ID="seenDonationListUC" runat="server" SeenInformation="Seen" />

I hope this will fix your problem.