Hi,

I made a copy of the Blog feature and wanted to customize it (make it more simple to use with less fields for the users we're launching this for).  I installed it into my test development environment and am just trying to get it to work first before I made any changes to the existing functionality.  Adding and editing postings, modifying the settings, using the calendar to access the archived blogs, and adding categories work fine.  However, the "Feedback" link, "Categories" and "Archives" link give me an error of the type:

Multiple controls with the same ID 'toyblogarchiveurl' were found. FindControl requires that controls have unique IDs.

where 'toyblogarchiveurl' is a different ID for each link (Feedback, Categories, Archives) that was clicked on.  This particular ID was set in this code for viewing the category postings:

        private void AddConnoicalUrl()
        {
            if (Page.Header == null) { return; }

            Literal link = new Literal();
            link.ID = "toyblogcaturl";
            link.Text = "\n<link rel='canonical' href='"
                + SiteRoot
                + "/TOYBlog/ViewCategory.aspx?cat="
                + categoryId.ToInvariantString()
                + "&amp;mid=" + moduleId.ToInvariantString()
                + "&amp;pageid=" + pageId.ToInvariantString()
                + "' />";

            Page.Header.Controls.Add(link);

        }

Can you tell me what might cause this type of error?  It seems like it's just an ID assigned to a link built on the fly and I've tried to rename these IDs so they don't clash with anything else but can't seem to get rid of the error.  If I click on "Feedback", I get the same type of error but the line it shows for the error is below (and I don't know why, because the layout.master only lists StyleSheetCombiner once so why is it complaining?):

Line 134:            StyleSheetCombiner style = Page.Master.FindControl("StyleSheetCombiner") as StyleSheetCombiner;
Line 135:            if (style != null) { style.IncludeGreyBoxCss = true; }

If anyone can shed some light on this, I'd really appreciate it.  I've spent hours trying different things like recopying the Blog module code and hand-typing in the code to see if I can see errors while I'm adding it and can't figure it out.

Thanks!!

Joe, thanks so much!  I just got back from vacation and thought hard about your comment that the code must be executing more than once.  My experience with issues like this in the past was related to the AutoEventWireup setting so I compared my code against yours and found that the areas that I had problems with had to do with AutoEventWireup set to True as opposed to False, I copied your code file for file but maybe I had inadvertently retyped the directive when I changed the class names and code behind names.  I was comparing the code but usually just skimmed this part, sheesh.  After I changed that setting, those links no longer err.  I owe you a coffee!