Error in retrieving data from database using query string for having in table

hi  i am using query string under gridview, when i click link on gridview "

Datas are in table,

 add_cat_name(field)

Educational aides-Glass Decorators  (Display the value in search related page)

Colleges-Arts & Science Colleges UG/PG (does not display the value because (&)

my coding

<asp:GridView ID="GridView2" GridLines="none" runat="server" AutoGenerateColumns="false" >
                    <Columns>
                    <asp:TemplateField>
                    <ItemTemplate>
                      
                        <a href="search_related.aspx?id=<%# Eval("add_cat_name")%>">
                         <asp:Label ID="Label9" Width="180px" CssClass="advance-link" runat="server" Text='<%#Eval("add_cat_name")%>'>
                         </asp:Label>
                         </a>
                        
                                         </ItemTemplate>               
                                    </asp:TemplateField>               </Columns>                 </asp:GridView>

in next page

page_load

 rsearch  = Request.QueryString["id"];

if (!IsPostBack)
        {
            bindrelatedSearch();
        }