Its not a good idea to have source code sent via email. Please answer everything here in this community, let others also learn. :)

wpf (http://en.wikipedia.org/wiki/Windows_Presentation_Foundation)
wcf (http://en.wikipedia.org/wiki/Windows_Communication_Foundation)
wwf (http://en.wikipedia.org/wiki/Windows_Workflow_Foundation)

do in this way:

...............
Object x;
x = s.Pop();
ArrayList al=x as ArrayList ;
if(al!=null)
{
al.Add("Something");
}

Hi,
Read example here (http://msdn.microsoft.com/en-us/library/system.data.oledb.oledbdatareader(VS.71).aspx). It will help you. You have to call dataReader4.Read() before reading it. If still...