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How do I use condition statements inside a gridView

Posted on 2009-05-11
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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

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Question by:vthunder70
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3 Comments
 
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Accepted Solution

by:
carlnorrbom earned 500 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!
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