Need help to built XML

 string currentidx = null;            
            //Enumerate the GridViewRows
            for (int index = 0; index <= gv.Rows.Count - 1; index++)
            {
                //Programmatically access the CheckBox from the TemplateField
                CheckBox cb = (CheckBox)gv.Rows[index].FindControl("RowLevelCheckBox");

                //If it's checked, read it...
                if (cb.Checked)
                {
                    currentidx = gv.DataKeys[index].Value.ToString();
                    lblMsg.Text += string.Concat("
", currentidx, "
");
                }
            }

            lblMsg.Text += "";

 


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