ASP.NET - access hidden field at code behind

At Degin time

<asp:DataList runat="server" ID="chkAuction">
     <ItemTemplate>
     <td valign="top">
           <asp:CheckBox runat="server" ID="chkSelect" />
           <asp:HiddenField runat="server" ID="hdnSelect" Value='<%#  dataBinder.Eval(Container, "DataItem.SubCategoryID") %>' />
   </td>

  <td valign="top">
    <asp:Label ID="lblSelecet" runat="server" Text='<%#  DataBinder.Eval(Container, "DataItem.SubCategoryName") %>'></asp:Label>
 </td>
  </ItemTemplate>
</asp:DataList>

At Code Behind

 protected string GetSelectedSubCategory()
    {
        string catID = "";
        foreach (DataListItem li in chkSale.Items)
        {
            if (((CheckBox)li.FindControl("chkSelect")).Checked == true)
            {
                //catID += ((HiddenField)li.FindControl("hdnSelect")).Value.ToString() + ";";
              
            }
        }
}

But I'm not able to access the hidden field's value, just return me blank if I take the display text then it gives me, but I require hidden field's value, binding coding is done on page load and it working properly
It's also not working it return me the hdnSelect.Value is blank, why its not working, ITs binding propery in hdnSelect.value when I'm debug it, it goes at that point, means there is not prob with binding. rather it is not picked up the value just return blank. my prob is that I can not use html control in it.

Please help in this issue, thank in advance

Dear reena,

change the code

"<asp:HiddenField runat="server" ID="hdnSelect" Value='<%#  dataBinder.Eval(Container, "DataItem.SubCategoryID") %>' />
"

to

<asp:HiddenField runat="server" ID="hdnSelect" Value='<%#  DataBinder.Eval(Container, "DataItem.SubCategoryID") %>' />

 

then check its once.

main problem is dataBinder it should be DataBinder

I am providing the working code please into sample application.

in Aspx page:

<asp:DataList runat="server" ID="chkAuction">

<ItemTemplate>

<td valign="top">

<asp:CheckBox runat="server" ID="chkSelect" />

<asp:HiddenField runat="server" ID="hdnSelect" Value='<%# DataBinder.Eval(Container, "DataItem.SubCategoryID") %>' />

</td>

<td valign="top">

<asp:Label ID="lblSelecet" runat="server" Text='<%# DataBinder.Eval(Container, "DataItem.SubCategoryName") %>'></asp:Label>

</td>

</ItemTemplate>

</asp:DataList>

<br />

<asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_Click" />

CodeBehind:

protected void Page_Load(object sender, EventArgs e)

{

if (!IsPostBack)

Fill();

}

private void Fill()

{

DataTable dt = new DataTable();

dt.Columns.Add(new DataColumn("SubCategoryID"));

dt.Columns.Add(new DataColumn("SubCategoryName"));

for (int index = 0; index < 3; index++)

{

DataRow dr = dt.NewRow();

dr[0] = index;

dr[1] = "Item" + index;

dt.Rows.Add(dr);

}

chkAuction.DataSource = dt;

chkAuction.DataBind();

}

protected void Button1_Click(object sender, EventArgs e)

{

StringBuilder selectedValues = new StringBuilder();

foreach (DataListItem var in chkAuction.Items)

{

CheckBox chkSelect = (CheckBox)var.FindControl("chkSelect");

HiddenField hdnSelect = (HiddenField)var.FindControl("hdnSelect");

if (chkSelect != null && chkSelect.Checked && hdnSelect != null)

{

selectedValues.AppendLine(hdnSelect.Value);

}

}

}

It' s working now. The prob is that I'd applied the javascript coding on it, so its not giving me the hidden field value, when I comment the javascript coding, its working fine.

Thanks being helpful

Hi reena,

Take one Extra column for Checkbox like isChecked in dataset.
bind the value to checkbox.
when u r moving one page to another page or sub mitting the values you need to stored checked values to dataset.
after binding the values it is automatically check /uncheck the control based on IsChecked column.