ArrayList stored in DataSet? (What can & Cant be stored?)

Well i have a DataSet that holds user information. One of this set of
info being (well many hopefully) a form of Array.

Now Array list start off fine, but when i actually assign and save
data to text, it is deleted it seems.. so either i am doing it wrong
or its not possible to save an ArrayList on a DataSet.

Is this the proper method to assign a data set? Then call it? And if
so, is there a special save flag or something? because as said, mine
isn't working..

// Retrieve the Array
        System.Collections.ArrayList alInv =
(System.Collections.ArrayList)drUser[0]["SomeData"];
// Add to the Array
        alData.Add( "blah" );
        alData.Add( "blah2" );
// Put the Array back in the DataSet
        drUser[0]["SomeData"] = alData;
// Pull it back out again (to act as if alData didnt exist)
        System.Collections.ArrayList alData2 =
(System.Collections.ArrayList)drUser[0]["SomeData"];
// Check the elements, there should be 2. It works for me.
        MessageBox.Show( "This works, here is the number of elements: "+
alData2.Count );
// Here is where it goes wrong
        this.dsUsers.WriteXml( "filename.db", 
System.Data.XmlWriteMode.WriteSchema 

Now if you were to reload the dataset and try all that again, noting
that the first thing you do is try and pull the ArrayList from the
DataSet to use it, you would get an error (least i do).

And upon examining the actual XML File that holds the DataSet, you get
this for the ArrayList Row's Column (or w/e).

<SomeData>System.Collections.ArrayList</SomeData>


So yea.. I'm doing something wrong i hope. The ability to physically
save objects, and arrays of objects would vastly help me. Please give
me some idea of what I'm doing wrong.. if its even possible... :/


-- 
Zeusbwr[at]gmail.com,
http://www.google.com/talk/

===================================
This list is hosted by DevelopMentor®  http://www.develop.com

View archives and manage your subscription(s) at http://discuss.develop.com