C#+ashx 文本保存到.txt文件

string path = @"E:\bootstrap\NetWork189\NetWork189\content\ustomer.txt";
            FileInfo file = new FileInfo(path);
            if (!file.Exists)
            {
                StreamWriter sw;
                sw = file.CreateText();
                sw.WriteLine(sb);
                sw.Close();
                json.Append("{\"status\":\"1\",\"msg\":\"提交成功！\"}");
            }