get td's inner text from repeater which is in master page

 
Hi,
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" runat="Server">
<asp:Repeater ID="RptrCtrl" runat="server" OnItemDataBound="RptrCtrl_ItemDataBound">
                <HeaderTemplate>
                    <table id="MainTbl" style="width: 100%; border: 1; border-color: #5c5c5c; border-style: solid;
                        border-width: 2px;">
                        <tr class="GrdHeader">
                 ...