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Message: [QUOTE="Teemu Keiski, post: 4257620"] It should be if you assign UniqueID to the ControlToValidate property. As validator uses FindControl to locate the control to be validated, it can find it on other naming containers if the given id is unique id (exposing the full containment hierarchy of the control) Assuming I have a user control, WebUserConntrol1.ascx and it's code-behind <%@ Control Language="vb" AutoEventWireup="false" CodeBehind="WebUserControl1.ascx.vb" Inherits="CSTestApplication1.WebUserControl1" %> <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox> Public Partial Class WebUserControl1 Inherits System.Web.UI.UserControl Public ReadOnly Property TheBox() As TextBox Get Return TextBox1 End Get End Property End Class And using it on aspx <%@ Page Language="vb" AutoEventWireup="false" CodeBehind="WebForm1.aspx.vb" Inherits="CSTestApplication1.WebForm1" %> <%@ Register Src="WebUserControl1.ascx" TagName="WebUserControl1" TagPrefix="uc1" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "[URL]http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd[/URL]"> <html xmlns="[URL]http://www.w3.org/1999/xhtml[/URL]" > <head runat="server"> <title>Untitled Page</title> </head> <body> <form id="form1" runat="server"> <div> <asp:Button ID="Button1" runat="server" Text="Button" /> <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ErrorMessage="RequiredFieldValidator"></asp:RequiredFieldValidator> <uc1:WebUserControl1 ID="UC1" runat="server" /> </div> </form> </body> </html> And relevant code to set the UNiqueID Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load Me.RequiredFieldValidator1.ControlToValidate = Me.UC1.TheBox.UniqueID End Sub [/QUOTE]

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