Question

chnaging a label text within a gridview item template within code

Asked by: brillox

I am trying to evaluate  an image.url  and according to this, display some text into a label contained withn a gridview item template binded to an object datasource.

the XHTML code is this

 <asp:TemplateField HeaderText="Photo" SortExpression="AssetPhoroUrl">                      
                        <ItemTemplate>
                        <div style="float:left;width:100%;text-align:center;">
                        <p>
                        <asp:Image ID="ImageGrid"  ImageAlign="Middle" Width="50px" Height="50px" ImageUrl='<%# Bind("AssetPhotoUrl") %> ' runat="server" />
                        </p>
                        <p>
                        <asp:Label ID="LabelPhotoText" runat="server" Text=""></asp:Label>
                        </p>
                        </div>
                        </ItemTemplate>
                    </asp:TemplateField>

and this is the code behind

 Protected Sub GridView1_RowDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles GridView1.RowDataBound
        Dim imageUrl As String = CType(e.Row.FindControl("ImageGrid"), Image).ImageUrl
        If imageUrl = "N/A" Then CType(e.Row.FindControl("LabelPhotoText"), Label).Text = "no photo"
    End Sub

I get an object not set to a reference type exception

what I am doing wrong ?

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Asked On
2008-07-25 at 07:15:34ID23595531
Tags

ASP.NET

Topics

Programming for ASP.NET

,

Microsoft Visual Basic.Net

Participating Experts
1
Points
0
Comments
5

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Answers

 

by: abelPosted on 2008-07-25 at 07:28:15ID: 22088892

What line is causing that error? On first sight, things look ok to me...

 

by: brilloxPosted on 2008-07-25 at 07:32:09ID: 22088919

sorry guys... I found  the solution.. which is this (in my page_Load event)

 For Each row As GridViewRow In GridView1.Rows
            Dim imageUrl As String = CType(row.FindControl("ImageGrid"), Image).ImageUrl
            Dim lbl As Label = CType(row.FindControl("LabelPhotoText"), Label)

            If imageUrl = "N/A" Then lbl.Text = "no photo"
        Next

anyway, the line that was causing the error was this one
   If imageUrl = "N/A" Then CType(e.Row.FindControl("LabelPhotoText"), Label).Text = "no photo"

can I close this question ?

 

by: abelPosted on 2008-07-25 at 07:33:15ID: 22088927

I tried your code and there does not seem to be an error....

 

by: abelPosted on 2008-07-25 at 07:34:27ID: 22088943

> can I close this question ?

Ah, I missed that post (cross posting). Yes of course. Ask to zero the points and make yourself the question resolver.

 

by: brilloxPosted on 2008-07-25 at 07:50:11ID: 22089083

Thanks and sorry for wasting your time :-)

brillox

20120131-EE-VQP-002

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