By commenting, you are accepting the DISQUS terms of service.This validator checks the markup validity of Web documents in HTML, XHTML, SMIL, Math ML, etc.private: void text Box1_Validating( Object^ sender, System:: Component Model:: Cancel Event Args^ e ) void text Box1_Validated( Object^ sender, System:: Event Args^ e ) public: bool Valid Email Address( String^ email Address, [Out]interior_ptrprivate void text Box1_Validating(object sender, System. Cancel Event Args e) private void text Box1_Validated(object sender, System. Length = 0 Then error Message = "Email address is required." Return False End If ' Confirm that there is an "@" and a "." in the email address, and in the correct order. Cr _ "For example '[email protected]' " Return False End Function Private Sub text Box1_Validating(By Val sender As Object, _ By Val e As System. Text, error Msg) Then ' Cancel the event and select the text to be corrected by the user. Event Args e) public bool Valid Email Address(string email Address, out string error Message) Private Function Valid Email Address(By Val email Address As String, By Ref error Message As String) As Boolean ' Confirm there is text in the control. Private Sub Voucher Email_Validating(By Val sender As System.
However, I believe the most likely reason for the above error message in Windows 10 is that sysprep ran into problems with the new Windows apps.
If you wish to validate specific content such as RSS/Atom feeds or CSS stylesheets, Mobile OK content, or to find broken links, there are other validators and tools available.
As an alternative you can also try our non-DTD-based validator.
Always start with a fresh installation and modify only what you require in your environment.
Another reason that some bloggers mentioned is that the Windows installation was not activated.