asp.net checkboxlist problem, not getting value

Question

Hello, I have following:

<asp:CheckBoxList ID="CheckBoxList1" runat="server" >
</asp:CheckBoxList>

Then:

protected void Page_Load(object sender, EventArgs e)
{
 if (!Page.IsPostBack)
 {
  CheckBoxList1.Items.Add(new ListItem("item1"));
  CheckBoxList1.Items.Add(new ListItem("item2"));
 }
 else
  CheckState();
}

Problem is everytime I debug in CheckState(), CheckBoxList1.Item[0].Selected and CheckBoxList1.Item[1].Selected is always false, even if the checkbox is actually checked!

help?

Answer 1

You need to add the items to your checkbox list in your page initialization code rather than Page_Load.

ASP.NET takes the values users post and maps them to your controls during PreLoad (between Init and Load). If you haven't added the items to your CheckBoxList yet, they don't exist yet, so ASP.NET can't select them.

protected void Page_Init(object sender, EventArgs e) {
    CheckBoxList1.Items.Add(new ListItem("item1"));
    CheckBoxList1.Items.Add(new ListItem("item2"));
}

protected void Page_Load(object sender, EventArgs e) {
    if (!Page.IsPostBack) {
        CheckState();
    }
}