后台拼接json字符串，其中包含后台的编辑器的内容，怎么写呢_ASP.NET

后台拼接json字符串，其中包含后台的编辑器的内容，如何写呢？
比如{"newscontent":"这里是从数据库里读取出来的编辑器里的内容"}

在生成JSON以后总是出错，这个是需要转义的吗，需要转哪些呢>?

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C# code

    /// <summary>    /// Encodes a string to be represented as a string literal. The format    /// is essentially a JSON string.    ///     /// The string returned includes outer quotes     /// Example Output: "Hello \"Rick\"!\r\nRock on"    /// </summary>    /// <param name="s"></param>    /// <returns></returns>    public static string EncodeJsString(string s)    {        StringBuilder sb = new StringBuilder();        sb.Append("\"");        foreach (char c in s)        {            switch (c)            {                case '\"':                    sb.Append("\\\"");                    break;                case '\\':                    sb.Append("\\\\");                    break;                case '\b':                    sb.Append("\\b");                    break;                case '\f':                    sb.Append("\\f");                    break;                case '\n':                    sb.Append("\\n");                    break;                case '\r':                    sb.Append("\\r");                    break;                case '\t':                    sb.Append("\\t");                    break;                default:                    int i = (int)c;                    if (i < 32 || i > 127)                    {                        sb.AppendFormat("\\u{0:X04}", i);                    }                    else                    {                        sb.Append(c);                    }                    break;            }        }        sb.Append("\"");             return sb.ToString();    }
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C# codepublic static string Cleaner(string _s){    if (_s == null) return "";    System.Text.StringBuilder sb = new System.Text.StringBuilder(_s);    sb.Replace(@"\", @"\\");    sb.Replace(@"'", @"\'");    sb.Replace(@"""", @"\""");    sb.Replace(Environment.NewLine, @"\n");    //替换连在一起的\r\n    sb.Replace("\n", @"\n");                //单个替换    sb.Replace("\r", @"\n");    return sb.ToString();}