Recently I received client requirements for validation Component fields using Event System. I am facing issue in message with multiple lines.

throw new Exception(“Experience must <br> be greater <br> than 10”);

The <br> tag is not working in the Tridion GUI message.

looking for solutions and ideas.

enter image description here

3 Answers 3


You would have to make CSS updates through a GUI extension besides using the new line (\n) in your exception message.

  • In your event system exception, you will be using the new line like this:

    throw new Exception("Some text before new line.\nSome text after new line.");

  • In the GUI extension, set the CSS white-space property to pre-wrap in the div element of the notification message.

    white-space: pre-wrap;

enter image description here


Assuming it's C# .NET, you can try using the Environment.NewLine property from the System namespace. NewLine actually equals \r\n.

String.Format("NewLine: {0}  first line{0}  second line{0}  third line",
  • I tried and not worked. Jan 23, 2020 at 15:37

Did you try xhtml line break


  • I tried and not worked <br/> tag. Jan 23, 2020 at 15:37

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