Hi Ondrej,

OK thank you, I've searched the entire internet and finally found a solution. For other users:

Make a new function called TrimWords.cs

Enter this code:

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using CMS.GlobalHelper;
using CMS.FileManager;
using CMS.CMSHelper;

/// <summary>
/// Summary description for TrimWords
/// </summary>
public static class TrimWords
{
public static String LimitWords(String Input)
{
// split input string into words (max 21...last words go in last element)
String[] Words = Input.Split(new char[] { ' ' }, 21);

// if we reach maximum words, replace last words with elipse
if (Words.Length == 21)
Words[20] = "...";
else
return Input; // nothing to do

// build new output string
String Output = String.Join(" ", Words);
return Output;
}
}

Enter this in your transformation:

<%# TrimWords.LimitWords(Eval("ColumnName").ToString())%>

Et Voila.