Cannot find ContentPlaceHolder13 Aug, 2018 in Software tagged Adding a ContentPlaceHolder / Cannot find ContentPlaceHolder / ContentPlaceHolder / how to resolve cannot find contentplaceholder error? by admin Put this placeholder inside of content <asp:ContentPlaceHolder ID=”head” runat=”server”> </asp:ContentPlaceHolder> <asp:ContentPlaceHolder ID=”nestedContent” runat=”server”> </asp:ContentPlaceHolder>