ASP.NET MVC - System.Data.DataSet not referenced problem - asp.net-mvc

Question

Well, first of all sorry about this question it must be pretty straight forward for you guys but I'm struggling myself on it, and I need to make it work :(
Well I'm trying t o use DataSet on my application
and when I render it I got:
The type 'System.Data.DataSet' is defined in an assembly that is not referenced. You must add a reference to assembly 'System.Data
in my application System.Data is already being referenced from C:\Windows\Microsoft.NET\Framework\v2.0.50727\System.Data.dll
and I'm using on my using clauses as well
using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Mvc;
This DataSet is a response from a Webservice
So any Ideas on how to fix this problem?
PS. I don't know if it helps, but I'm using nHaml to render my view
Thanks a lot
UPDATE:
The only solution I found for now was to instead passing a DataSet to the view converter the DataSet to a
<List<List<String>>
and pass a loop through the entire DataSet like this
List<List<String>> myList = new List<List<String>>();
foreach (DataRow row in dsTrades.Tables[0].Rows)
{
List<String> myListColumns = new List<String>();
for (var index = 0; index < dsTrades.Tables[0].Columns.Count; index ++)
{
myListColumns.Add(row[index].ToString());
}
myList.Add(myListColumns);
}
// THIS SHOULD BE THE DATASET AND NOW
// IT'S CONVERTED TO A LIST WITH STRINGS LIST INSIDE
viewModel.Trades = myList;
return View(viewModel);
Actually this is completely crazy ins't it?
All this job could be easily done into the view if using DataSet directly
I hope anyone can help me with a more simplistic way to do it
Thank you :)
UPDATE (SOLUTION)
Simon's answer was really effective and it worked on the first try after adding namespaces for System.Data and System.Xml but at the same time, Josh's answer present a very nice and cool way to work with DataSets, which on my opinion works much better and I think I'll go for it now.
Thanks for you help

Answer 1

try adding an explicit reference to System.Data in your nhaml configuration
<?xml version="1.0"?>
<configuration>
...
<configSections>
<section name="nhaml" type="NHaml.Configuration.NHamlConfigurationSection, NHaml"/>
</configSections>
...
<nhaml autoRecompile="true">
<assemblies>
<clear/>
...
<add assembly="System.Data, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"/>
</assemblies>
<namespaces>
<clear/>
...
<add namespace="System.Data"/>
</namespaces>
</nhaml>
obviously replacing "..." with your other references and config

Answer 2

The only thing I could think of is that in the context of the page, the System.Data reference is not visible.
Try adding the namespace in your web.config:
<pages>
<controls />
<namespaces>
<add namespace="System.Data"/>
</namespaces>
</pages>
I know it's not really part of your question, but I would recommend building a class filled with properties representing the fields in your datatable. Using Linq, you can easily convert your rows into the class object and return a list of them. Here's some rough (and uncompiled) code.
[Serializable]
public class MyClass
{
public string Property1 { get; set; }
public string Property1 { get; set; }
}
You want it to be serializable so your web service can return it as xml or json (however you are returning it). The linq would look something like this:
var result = from r in dataSet.Table[0].Rows.AsEnumerable()
select new MyClass() {
Property1 = r["Field1"].ToString()
Property2 = r["Field2"].ToString()
};
return result.ToList();
In my personal experience, DataSets tend to be resource hogs. Also, Linq will be more efficient than your for loops.
Hope this helps.

Answer 3

Delete the Reffrence(system.Data) ..and Add the same reffrence again .. it might be work..