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  #1 (permalink)  
Old March 25th, 2006, 03:52 AM
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Default e.Item.FindControl("DropdownId") Returning Null

Hi Group,

I have a datagrid with dropdown in my application.
I want to fill the data in dropdown by an ArrayList
for that I am using "e.Item.FindControl("DropdownId")"
but this function is returning NULL THUS I m getting exception
"Object Refrence not set to an Instance to Object",

Here is the code I wrote (ASP.NET 1.1)...

Hope I get some help from you,

///Cdoe Behind

        private void dataGrid1_ItemDataBound(object sender, DataGridItemEventArgs e)

            if(e.Item.ItemType == ListItemType.Footer)

                System.Web.UI.WebControls.DropDownList drp = new DropDownList();
                drp = (DropDownList)e.Item.FindControl("listAnup");
                drp.DataSource=newArrayList;//This Statement throwing exception


///aspx code

<asp:datagrid id=dataGrid1 style="Z-INDEX: 101; LEFT: 256px; POSITION: absolute; TOP: 8px" runat="server" ShowFooter="True" CaptionAlign="Top" Caption="Hello" BackColor="RosyBrown" AllowPaging="True" Height="256px" Width="70%" DataSource="<%# dataSet1 %>" PageSize="2" CellPadding="2" CellSpacing="2">
                <FooterStyle ForeColor="#FFFF80" BorderColor="#E0E0E0" BackColor="Gray"></FooterStyle>
                <SelectedItemStyle ForeColor="#804040" BorderColor="#FFE0C0" BackColor="Aqua"></SelectedItemStyle>
                <EditItemStyle ForeColor="#FFE0C0" BackColor="#C0FFC0"></EditItemStyle>
                <AlternatingItemStyle ForeColor="DarkOliveGreen" BackColor="#FFC080"></AlternatingItemStyle>
                <ItemStyle ForeColor="#404040" BackColor="Khaki"></ItemStyle>
                <HeaderStyle BackColor="RosyBrown"></HeaderStyle>

                    <asp:TemplateColumn HeaderText="Select">
                            <asp:Label id="labelSelectTyre" runat="server"></asp:Label>
                    <asp:TemplateColumn HeaderText="MTD">
                            <asp:DropDownList id="listAnup" AutoPostBack="True" runat="server" Width="150px"></asp:DropDownList> </ItemTemplate>

                <PagerStyle VerticalAlign="Middle" ForeColor="#404000" BackColor="White" PageButtonCount="5"
                <PagerStyle NextPageText="Next" PrevPageText="Previous" HorizontalAlign="Center" Position="TopAndBottom"
                    BackColor="#D8D8DA" PageButtonCount="15" Mode="NumericPages"></PagerStyle>

                <PagerStyle NextPageText="Next" PrevPageText="Previous"
                HorizontalAlign="Center" Position="TopAndBottom" BackColor="#D8D8DA"
                PageButtonCount="15" CssClass="dgridPaging"


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Old March 27th, 2006, 03:53 PM
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The problem is that you have added the control in the "ItemTemplate" node and your code is checking if the dropdownlist is in the footer. Try using the "if" below:
if((e.Item.ItemType==System.Web.UI.WebControls.Lis tItemType.Item)||(e.Item.ItemType==System.Web.UI.W ebControls.ListItemType.AlternatingItem))

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