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mfoof · June 26th, 2006, 06:10 PM

When I add a second level category, I receive the following error:

Quote:

quote:Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Web.HttpException: Cannot have multiple items selected in a DropDownList.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of

Any ideas? I re-installed and attempted to do this from a clean installation and still managed to get the error.

Imar · June 27th, 2006, 04:18 PM

Hi mfoof,

I can't look at the original source right now, as my source control server is down. I'll take a look ASAP but that might take a few days.

In the mean time, you can try calling ClearSelection on the relevant drop down control, right before it gets its data.

Please let me know if that helps; if not, I'll look into this but like I said, it may take a couple of days...

Imar

mfoof · July 3rd, 2006, 04:34 PM

Looks like that did it! Made the following modification to the UpdateDropdown in Categories.aspx.vb:

Private Sub UpdateDropDown(ByVal listNumber As Integer)
        Select Case listNumber
            Case 1
                lstCategoryLevel1.DataBind()
                lstCategoryLevel1.ClearSelection()
                lstCategoryLevel1.Items.FindByText(txtLevel1.Text) .Selected = True
                txtLevel1.Text = ""
            Case 2
                lstCategoryLevel2.DataBind()
                lstCategoryLevel2.ClearSelection()
                lstCategoryLevel2.Items.FindByText(txtLevel2.Text) .Selected = True
                txtLevel2.Text = ""
            Case 3
                lstCategoryLevel3.DataBind()
                lstCategoryLevel3.ClearSelection()
                lstCategoryLevel3.Items.FindByText(txtLevel3.Text) .Selected = True
                txtLevel3.Text = ""
        End Select
    End Sub

Imar · July 4th, 2006, 12:22 AM

Great. I'll take another look at the source, and if this is indeed the best way to fix the problem, I'll ask Wrox to add it to the errata section.

Thanks for spotting and mentioning this....

Imar
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Imar Spaanjaars
Everyone is unique, except for me.
Author of ASP.NET 2.0 Instant Results and Beginning Dreamweaver MX / MX 2004