Question

What am I doing wrong? I have a CheckBoxList and I want to handle each element one by one. I get an error on the “cbl.Items.Count” line suggested the element is not initialized with “new”. Thanks you very much!

CheckBoxList cbl = (CheckBoxList)FindControl("CBL_categ");
for (int i = 0; i < cbl.Items.Count; i++)
{
    if (cbl.Items[i].Selected)
        catn = cbl.Items[i].Value;
}

EDIT:

<asp:Content ID="Content4" runat="server" 
    contentplaceholderid="ContentPlaceHolder3">
    <asp:Label ID="statusLabel" runat="server" Text=""> </asp:Label>

    <asp:GridView ID="GridView1"  AutoGenerateColumns="False" runat="server" 
    DataSourceID="SqlDataSource1" Visible="False" >
        ....

    </asp:GridView>


    <br />
    Categories:<asp:CheckBoxList ID="CBL_categ" runat="server" DataTextField="name" DataValueField="name">
    </asp:CheckBoxList>

</asp:Content>

Answer 1

You need an error check in there because it may be returning null.

CheckBoxList cbl = (CheckBoxList)FindControl("CBL_categ");

if (cbl != null)
{
        for (int i = 0; i < cbl.Items.Count; i++)
        {
            if (cbl.Items[i].Selected)
            {
                catn = cbl.Items[i].Value;
             }
         }
 }