How to convert and parse an xml file to Dataset

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XML

dataset

In a web application project, I used the following code to load an xml file:

string url = "http://localhost:48677/Service1.svc/GetDataSet";
 var webClient = new System.Net.WebClient();
 string ReadData = webClient.DownloadString(url);

The xml file posted in the URL is sourced a dataset. It consists of 2 parts: The 1st part is the schema part, like that:

<xs:schema xmlns=...>
  ...
</xs:element>

The 2nd part displays the data values, like that below:

<diffgr:difffram ...>
  <NewDataSet xmlns="">
    <MyData diffgr:id=...>
      <ID>1</ID>
    </MyDataSet>
    .....
  </NewDataSet>
</diffgr:diffgram>

I have tried different approaches to try to convert/parse the ReadData into a DataSet, but not successful. Please advise me how to implement this conversion if you know. Thanks.