I have a business object that return the list of contacts to the user interface. Here is the code of the method:
public DataTable getContact ()
{
SqlConnection conn = new SqlConnection (...);
DataSet dsContact = new DataSet ();
SqlDataAdapter adptContact = new SqlDataAdapter ("SELECT * FROM Contact ORDER BY Contact", conn);
adptContact.Fill (dsContact, "Contact");
return dsContact.Tables ["Contact"];
}The user interface should get the list and add it to it's DataSet. A control will then be bounded to this list.
I have some questions:
Must I pass through a DataSet and a DataAdapter class to fill a DataTable?
I return a DataTable instead of a DataSet because I figure that it is smaller and should be faster. Am I right in this assumption?
When a DataTable (or DataSet) is passed like this between layers, what is really passed between the EXE and the DLL, a XML string or the object is marshalled and passed?
In the user interface, I would like to put all the tables I get like this in a DataSet instead of defining a property for each one, but I can't get the DataSet to add the DataTable. Here is the code:Contact contact = new Contact ();
DataTable dtContact = contact.getContact ();
dsMain.Tables.Add (dtContact); // Exception is throwed here
Any suggestions?
TIA
