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Message: [QUOTE="RTT, post: 6401, member: 2333"] It's my first time i want to write a cotum validator but it doesn't seem to work. In de page i've put this validator: <asp:CustomValidator id="CVFBeginDate" OnServerValidate="CVFBeginDate_ServerValidate" runat="server" ErrorMessage="Please fill in a valid date as startdate" ControlToValidate="TxtBeginDate">*</asp:CustomValidator> in de codebehindpage i have created this sub: Protected Sub CVFBeginDate_ServerValidate(ByVal source As System.Object, ByVal args As System.Web.UI.WebControls.ServerValidateEventArgs) Handles CVFBeginDate.ServerValidate Try tmp = args.Value.Split("/") testDate = New Date(tmp(2).ToString(), tmp(1).ToString(), tmp(0).ToString()) args.IsValid = True Catch args.IsValid = False End Try End Sub it doesn't seem to work. do you have to put something special to the custom validator? [/QUOTE]