?
Solved

How do I use condition statements inside a gridView

Posted on 2009-05-11
3
Medium Priority
?
266 Views
Last Modified: 2013-11-07
Hi Expers,
I am developing a website for my rugby team. This website has a Schedule page, on this page I have a gridView that has columns for date, is home, opponent, score, game type

The "score" column is an TemplateField and inside the ItemTemplate I have 3 labes:

1) lblPointsInFavor (points for the team)
2) lblPointsAgainst(points against the team)
3) winLoss (no text, this is where I will like to show a W or L depending on the other two labels)

The problem is that I've tried everthing that I can think of, google, etc. . to find the value of those labels so that on the RowDataBound event I can make a comparison and then give the winLoss label the appropiate "W" or "L"

I keep getting this annoying error: Object reference not set to an instance of an object.

I will paste the code below.

Thanks so much!

aspx page (GridView code)
=============================
<asp:GridView ID="gvSchedule" runat="server" AutoGenerateColumns="False" AllowSorting="true" DataKeyNames="intGameTypeID"
                  Width="425px" BackColor="White" BorderColor="#CCCCCC" BorderStyle="None" 
                  BorderWidth="1px" CellPadding="4" ForeColor="Black" GridLines="Horizontal">
       <Columns>
        <asp:BoundField DataField="dtmGameStart" HtmlEncode="False" DataFormatString="{0:MMM dd, yyyy - hh:mm tt}" HeaderText="Date" />
        <asp:BoundField DataField="fIsHome" />
        <asp:HyperLinkField HeaderText="Opponent" DataNavigateUrlFields="strOpponentURL" DataNavigateUrlFormatString="{0}" Target="_blank" DataTextField="strOpponentName" />
        <asp:TemplateField HeaderText="Score"> 
            <ItemTemplate>
                <asp:Label ID="lblPointsInFavor" runat="server" Text='<%# Eval("intPointsFavor") %>' /> 
                - 
                <asp:Label ID="lblPointsAgainst" runat="server" Text='<%# Eval("intPointsAgainst") %>' />
                &nbsp;
                [<asp:Label ID="winLoss" runat="server" />]
            </ItemTemplate>
        </asp:TemplateField>
        <asp:BoundField Visible="true" DataField="strGameType" HeaderText="Game Type" />
       </Columns>
        <FooterStyle BackColor="#CCCC99" ForeColor="Black" />
        <SelectedRowStyle BackColor="#CC3333" Font-Bold="True" ForeColor="White" />
        <PagerStyle BackColor="White" ForeColor="Black" HorizontalAlign="Right" />
        <HeaderStyle BackColor="#333333" Font-Bold="True" ForeColor="White" />
    </asp:GridView>
 
 
=========================
aspx.vb code
==========================
If e.Row.RowType = DataControlRowType.DataRow Then
 
            'Dim lblPointsInFavor As Label = DirectCast(e.Row.FindControl("lblPointsInFavor"), Label)
            Dim lblPointsInFavor As Label = DirectCast(gvSchedule.FindControl("lblPointsInFavor"), Label)
            Dim lblPointsAgainst As Label = DirectCast(gvSchedule.FindControl("lblPointsAgainst"), Label)
            Dim winLoss As Label = DirectCast(gvSchedule.FindControl("winLoss"), Label)
 
            Dim intFor As Integer = Convert.ToInt16(lblPointsInFavor.Text)
            Dim intAgainst As Integer = Convert.ToInt16(lblPointsAgainst.Text)
 
            If intFor > intAgainst Then
                winLoss.Text = "W"
            Else
                winLoss.Text = "L"
            End If
 
 
        End If

Open in new window

0
Comment
Question by:vthunder70
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
3 Comments
 
LVL 18

Accepted Solution

by:
carlnorrbom earned 2000 total points
ID: 24356050
Hi,

You need to change the FindControl operations to look like the top one which is commented out. You need to reference the datarow being bound in the current event through e.Row.FindControl:

            Dim lblPointsInFavor As Label = DirectCast(e.Row.FindControl("lblPointsInFavor"), Label)
            Dim lblPointsAgainst As Label = DirectCast(e.Row.FindControl("lblPointsAgainst"), Label)
            Dim winLoss As Label = DirectCast(e.Row.FindControl("winLoss"), Label)

/Carl.
0
 

Author Comment

by:vthunder70
ID: 24356178
Hi Carl,

I tried that but still gives me the same error =(
0
 

Author Comment

by:vthunder70
ID: 24356241
Sorry Carl,

It is working! thanks. I had commented out my code on the aspx page =P d'oh!

Txs!
0

Featured Post

Free Tool: Site Down Detector

Helpful to verify reports of your own downtime, or to double check a downed website you are trying to access.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

More often than not, we developers are confronted with a need: a need to make some kind of magic happen via code. Whether it is for a client, for the boss, or for our own personal projects, the need must be satisfied. Most of the time, the Framework…
With User Account Control (UAC) enabled in Windows 7, one needs to open an elevated Command Prompt in order to run scripts under administrative privileges. Although the elevated Command Prompt accomplishes the task, the question How to run as script…
Add bar graphs to Access queries using Unicode block characters. Graphs appear on every record in the color you want. Give life to numbers. Hopes this gives you ideas on visualizing your data in new ways ~ Create a calculated field in a query: …
In this video, Percona Solution Engineer Dimitri Vanoverbeke discusses why you want to use at least three nodes in a database cluster. To discuss how Percona Consulting can help with your design and architecture needs for your database and infras…

719 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question