Question

I am creating a custom view in a SharePoint visual Web Part using ASP.NET (Visual C#) and have a CheckBoxList, and a button.

MarkUp for the List & Button:

<td>
    <asp:checkboxlist ID="cblYearLst" runat="server" EnableViewState="true" />
</td>
<td>
     <asp:Button ID="btnRefineSearch" Text="Refine Search" runat="server" />
</td>

I add items to the CheckBoxList on PreRender:

if (!IsPostBack)
{
    if (LstYears != null)
    {
        for (int i = 0; i < LstYears.Count(); i++)
        {
            cblYearLst.Items.Add(new ListItem(LstYears[i], LstYears[i]));
        }
    }
}

And I call the event Handler for the button on Page_Load:

btnRefineSearch.Click += new EventHandler(this.btnRefineSearch_Click);

All of the CheckBox list-items do not stay selected after the button is clicked. I can retrieve the selected values, but they won’t display as selected. When I add the Click event handler for the button in the pre-render event, the data is displayed appropriately but the selected values can no longer be retrieved by my Click event.

Any ideas on what might be causing this behaviour??

Answer 1

I figured out the issue, since I have AutoEventWireUp set to true as Keenan has suggested it should all work if I do it in the page_load.

The problem was that Page_Load was being called twice, and I discovered that this was because I was redirecting the user to the same URL with QueryString parameters. After I made the much needed changes, my code works very well.

+1 Keenan for your help and thank you (@jfmags) for tipping me off by telling me you think it is something else.

😀