asp.net textarea换行函数代码

/// <summary>
/// 替换html中的特殊字符
/// </summary>
/// <param name="thestring">需要进行替换的文本。</param>
/// <returns>替换完的文本。</returns>
public string htmlencode(string thestring)
{
thestring=thestring.replace(">", ">");
thestring=thestring.replace("<", "<");
thestring=thestring.replace(" ", "  ");
thestring=thestring.replace("\"", """);
thestring=thestring.replace("\'", "'");
thestring=thestring.replace("\n", "<br/> ");
return thestring;
}