StringBuilder strback = new StringBuilder();
        strback.Append("{");
        strback.Append("\"state\":{");
        strback.AppendFormat("\"return\":\"{0}\"", loginString);
        strback.AppendFormat(",\"info\":\"{0}\"", 中文输出乱码);
        strback.AppendFormat(",\"code\":\"{0}\"", "");
        strback.Append("}");
        strback.Append(",\"data\":{");
        strback.Append("\"items\":[");
        strback.Append("{");
        strback.AppendFormat("\"UserName\":\"{0}\"", userName );      
        strback.AppendFormat(",\"Password\":\"{0}\"", password );
        strback.Append("}");
        strback.Append("]");
        strback.Append("}");
        strback.Append("}");
        string strJson = strback.ToString();
        Context.Response.Write(strJson);
        Context.Response.End();
如果有中文存在在浏览器里面显示乱码,这个怎么改