Problem FindControl in DataList

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I'm having trouble with FindControl in DataList
My aspx:

ASP.NET

<form id="form1" runat="server">
    <div>
    
        <asp:DataList ID="DataList1" runat="server">
        <ItemTemplate>
        <asp:Label runat="server" ID="lbl" Text='<%#Eval("idProduct") %>'></asp:Label>
        <asp:Button runat="server" ID="btn" Text='select' onclick="btn_Click"/>
        </ItemTemplate>
        </asp:DataList>
    
    </div>
    <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
    </form>

code:

C#

protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            Bind();
        }
        if (Session["idProduct"] != null)
        {
            Label1.Text = Session["idProduct"].ToString();
        }
    }

    void Bind()
    {
        Product Prd = new Product();
        DataTable dt = n.Get();
        DataList1.DataSource = dt;
        DataList1.DataBind();
    }
    protected void btn_Click(object sender, EventArgs e)
    {
        Label l = (Label)DataList1.FindControl("lbl");
        //when click btn,I get:Object reference not set to an instance of an object.
        Session["idProduct"] = l.Text;
        
    }

Posted 30-May-12 20:06pm

giatuan2011

Updated 30-May-12 20:19pm

v2

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maneesh katiyar · Answer 1 · 2012-05-30T20:38:00

use this code

XML

<form id="form1" runat="server">
    <div>

        <asp:DataList ID="DataList1" runat="server">
        <ItemTemplate>
        <asp:Label runat="server" ID="lbl" Text='<%#Eval("idProduct") %>'></asp:Label>
        <pre><asp:Button runat="server" ID="btn" Text='select' commandname="Pro" commandargument='<%#Eval("idProduct") %>' onclick="btn_Click"/>

</ItemTemplate>
</asp:DataList>

</div>
<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
</form>

protected void datalist_itemcommand(object sender, EventArgs e)
{
if(e.commandname=="Pro")
{
string product=e.commandargument.tostring();
Session["idProduct"] = product;
}
}

<pre></pre>