I am building a web service that gets data via Stored Procedures from a db and provides the result as JSON. The solution is built as a MVC 4 Web API project. I have to retrieve the data via Stored Procedures for several reasons (security, SQLAnywhere db, etc).It is a relatively small scale project so I have opted for not defining a Model in the Web Service layer to save work (and possibly performance). There will likely be models in the front end application (which will be a MVC 4 Web Application).The reasons why I am including an extra layer in the form of a Web Service is to a) add extra security, and b) that there will likely be a iPhone app for part of the application which then can utilize the same web service as the site.It is working as I want it to, so what I want feedback on isWhat do you think of the general approach to build a MVC 4 Web API solution without explicit models?Do you have any comments on how to improve the details of the implementation?One potential thought I have had is to skip the dataset and make a direct call to the Stored Procedure and loop over a datareader, which could potentially be faster. The other potential change is to loop over the datatable and build up the JSON manually instead of using the serializer.What I like about the current solution is that it can be done on very few lines of code and that I do not have to manually name each JSON object since it is inherited from the datatable within the dataset. I define a dataset called dsProducts that is loaded with a TableAdapter.    // GET api/products    public string Get()    {        string result = ;        dsProductTableAdapters.GetProductsTableAdapter taTemp = new dsProductsTableAdapters.GetProductsTableAdapter();        dsProducts dsTemp = new dsProducts();        try {            taTemp.Fill(dsTemp.GetProducts);            result = jsonHelper.convertJSONString(dsTemp.GetProducts);        } catch (Exception ex) {            result = {\error\:\1\};        }        return result;    }The convertJSONString and its help functions are defined as:    public static string convertJSONString(DataTable table)    {        JavaScriptSerializer serializer = new JavaScriptSerializer();        return serializer.Serialize(table.ToDictionary());    }    static Dictionary<string, object> ToDictionary(this DataTable dt)    {        return new Dictionary<string, object> {            { dt.TableName, dt.convertTableToDictionary() }};    }    static object convertTableToDictionary(this DataTable dt)    {        var columns = dt.Columns.Cast<DataColumn>().ToArray();        return dt.Rows.Cast<DataRow>().Select(r => columns.ToDictionary(c => c.ColumnName, c => r[c]));    }
Web API and Stored Procedures
c#;asp.net;web services