I created a dataset using the DataSet Designer -
http://aspnet.4guysfromrolla.com/articles/020806-1.aspx

My objective was to serialize the generated dataset.

protected void Page_Load(object sender, EventArgs e)
   {
       SalesOrderHeaderTableAdapter Adapter =
           new SalesOrderHeaderTableAdapter();
       AdventureWorks.SalesOrderHeaderDataTable Orders =
           Adapter.GetDataBy(new DateTime(2004, 7, 1));
       this.GridView1.DataSource = Orders;
       this.GridView1.DataBind();        
///////////////////////////////////////////////////////////////////////////////
       FileStream fs = new FileStream("SerializedData.xml", FileMode.Create);
       XmlSerializer xs = new XmlSerializer(typeof(AdventureWorks));
       xs.Serialize(fs, Orders);
       fs.Close();
   }

{"Unable to cast object of type 'SalesOrderHeaderDataTable' to type
'AdventureWorks'."}

If it is not painful obvious already let me say I do not know what I am
doing so any help and explanation will be greatly appreciated.