How to get selected CheckBoxList Item values by checking its Attribute assigned on ItemDataBound with prefix text with checked item Value using JQuery in ASP.Net

Hi born2achie,

I have created a sample which full fill your requirement you need to modify it according to your need

HTML

<div>
    <asp:Repeater ID="rptCustomers" runat="server" OnItemDataBound="Rp_ItemDataBound">
        <ItemTemplate>
            <asp:CheckBox ID="chkID" runat="server" />
            <br />
        </ItemTemplate>
    </asp:Repeater>
    <br />
    <br />
    <asp:HiddenField ID="hfCheckedValues" runat="server" />
    <br />
    <asp:Button ID="btnSubmit" Text="Submit" runat="server" />
    <br />
    <br />
    <asp:Label ID="lblCheckedValues" runat="server" />
</div>
<div>
    <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
    <script type="text/javascript">
        $(function () {
            $('[id*=btnSubmit]').click(function () {
                var checkedvalues = "";

                $('span[chk]').each(function () {
                    var checkbox = $(this).find('[id*=chkID]');
                    if ($(checkbox).is(':checked')) {
                        checkedvalues += "chk" + $(this).attr('chk') + ",";
                    }
                });
                var values = checkedvalues.substring(0, (checkedvalues.length - 1));
                $('[id*=hfCheckedValues]').val(values); // assigned values to hiddenfield.
                $('[id*=lblCheckedValues]').html(values); // assigned values to label.
                return false;
            });
        });
    </script>
</div>

C#

protected void Page_Load(object sender, EventArgs e)
{
    DataTable dt = new DataTable();
    dt.Columns.AddRange(new DataColumn[3] { new DataColumn("Id"), new DataColumn("Name"), new DataColumn("Country") });
    dt.Rows.Add(1, "John Hammond", "United States");
    dt.Rows.Add(2, "Mudassar Khan", "India");
    dt.Rows.Add(3, "Suzanne Mathews", "France");
    dt.Rows.Add(4, "Robert Schidner", "Russia");
    dt.Rows.Add(5, "John", "UK");
    dt.Rows.Add(6, "Robert", "USA");
    dt.Rows.Add(7, "Schidner", "Austria");
    rptCustomers.DataSource = dt;
    rptCustomers.DataBind();
}
int rowval = 1;

protected void Rp_ItemDataBound(object sender, RepeaterItemEventArgs e)
{
    CheckBox chkcontrool = (CheckBox)e.Item.FindControl("chkID");

    if (chkcontrool != null)
    {
        CheckBox chk = (CheckBox)chkcontrool;
        if (e.Item.DataItem.GetType().ToString() == "System.Data.DataRowView")
        {
            DataRowView view = (DataRowView)e.Item.DataItem;
            chk.Attributes.Add("chk", rowval.ToString());
        }
    }
    rowval = rowval + 1;
}

VB.Net

Protected Sub Page_Load(sender As Object, e As EventArgs)
    Dim dt As New DataTable()
    dt.Columns.AddRange(New DataColumn(2) {New DataColumn("Id"), New DataColumn("Name"), New DataColumn("Country")})
    dt.Rows.Add(1, "John Hammond", "United States")
    dt.Rows.Add(2, "Mudassar Khan", "India")
    dt.Rows.Add(3, "Suzanne Mathews", "France")
    dt.Rows.Add(4, "Robert Schidner", "Russia")
    dt.Rows.Add(5, "John", "UK")
    dt.Rows.Add(6, "Robert", "USA")
    dt.Rows.Add(7, "Schidner", "Austria")
    rptCustomers.DataSource = dt
    rptCustomers.DataBind()
End Sub
Private rowval As Integer = 1

Protected Sub Rp_ItemDataBound(sender As Object, e As RepeaterItemEventArgs)
    Dim chkcontrool As CheckBox = DirectCast(e.Item.FindControl("chkID"), CheckBox)

    If chkcontrool IsNot Nothing Then
        Dim chk As CheckBox = DirectCast(chkcontrool, CheckBox)
        If e.Item.DataItem.[GetType]().ToString() = "System.Data.DataRowView" Then
            Dim view As DataRowView = DirectCast(e.Item.DataItem, DataRowView)
            chk.Attributes.Add("chk", rowval.ToString())
        End If
    End If
    rowval = rowval + 1
End Sub

ScreenShot