RadTreeList SelectedIndexChanged Event producing the previous value as Output

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ASP.NET

Telerik

Dear Sir/Madam,

RadTreeList SelectedIndexChanged Event producing the previous value as Output

consider, In treeList, i have dataitems A-->977,B--->978, C--->979

If i select B-->978 means that will produce the o/p as A-->977

protected void RadTreeList1_SelectedIndexChanged(object sender,EventArgs e)
        {
            
            foreach (TreeListDataItem grddt in RadTreeList1.SelectedItems)
            {
                int product_id = Convert.ToInt32(grddt.GetDataKeyValue("product_id"));

            }
            
        }

if i select the B means, it produce the result A.
I need to display if we A means A, B means B

How to do
Please Help me

Thanks in Advance