public class TxtOperational
    {
        public static string FormatText(string text)
        {
            string formatted = "";
            StringBuilder sb = new StringBuilder(text);
            sb.Replace(" "," ");
                StringReader sr = new StringReader(sb.ToString());
                StringWriter sw = new StringWriter();
                while (sr.Peek() > -1)
                {
                    string temp = sr.ReadLine();
                    sw.Write(temp + "<br />");
                }
                formatted = sw.GetStringBuilder().ToString();
            
            return formatted;
        }
    }

------解决方案--------------------
上面的方法就是实现


在文本框中这样输入：  


（我     来       

了...）  

在页面上会这样显示：  

（我     来       

了...）  


------解决方案--------------------
同意楼上的！