Delete Confirmation Message Java Script

<asp:TemplateField ShowHeader="False">

   <ItemTemplate>

 <asp:LinkButton ID="LinkButton1" runat="server" CausesValidation="False" Visible="false" CommandArgument='<%# Bind("Key")%>'

       CommandName="Delet" OnClientClick="return confirm('Are you sure you want to delete this contact record?');"

          Text="Delete"></asp:LinkButton>

        </ItemTemplate>

  </asp:TemplateField>