Is there a way to add an Attribute to an existing type? Like say I
wanted to add a [MyCustomAttribute]  to the List<int> type, how would I
go about doing that?
Also is there any way to attach Attributes to types at runtime?

I have a dataset with 2 DataTables : Groups and Persons. I make a
relation between this 2 DataTables using one DataColumn in each
datatable. Finally I use this dataset in a dataGrid. So I would like to
have a display like :

I need std::vector like capability for several custom classes. I already
discussed this extensively in the thread named ArrayList without Boxing and
Unboxing. The solution was to simply create non-generic (non C++ template)
std::vector like capability for each of these custom ...

I've had nothing but trouble from the System.Net.Mail objects, but I
finally need to make them work, and I can't for the life of me see what
I'm doing wrong.
I pared back my mail transaction to the bare minimum:

does anyone know if an update is available (or at least planned) for
the much cited standard reference
IMPROVING .NET APPLICATION PERFORMANCE AND SCALABILITY?
link:

Does anyone know how to add a VB class to a C# project and then
instantiate the Vb object and step through the code?
Can we do tihs with a VB DLL?

My application has many automatic features because it is designed to
run without any user interfering.
In fact, my app will work on a system without a keyboard or a mouse.
Anyway, from time to time, the app will perform some tasks. When

How to progrommatically ...generating class object and how to send the class
name in a  property value

I'm implementing drag and drop between two listviews (in detail view mode).
When I drag an item from box a to box b, I then process information relating
to the two items. The item from box a does not need to be added into box b.
What I can't see how to do is for the item under the ...

I would like to get information from remote computer and printer
connected to network.
I don't want to use windows WMI service.
Thank you for your help.

Ist there a collection that holds its data sorted (i.e. inserts items
sorted) AND allows to have duplicate values (by wich is sorted) ?
I would like to store elements in that collection wich should be sorted
by its Property "CreationTime" of type DateTime, where two or more

Does anyone know how to get visual studio 2005 express to trust my network?

string var = DateTime.Today.Month.ToString()  + "-" +
DateTime.Today.Day.ToString() + "-" + DateTime.Today.Year.ToString() + "-" +
DateTime.Today.Hour.ToString() + "-" + DateTime.Today.Minute.ToString() +
"-" + DateTime.Today.Second.ToString();

I am building a project using C# in VS2005.
I need to use a COM ActiveX control in my project but I do not have a
Form on which I want to place this control. I only want to create an
object of this control class and use it right away,

Can anyone please tell me how can i create xls file?
i then need to write to it.
I am creating the file using File.Create(file.xls);
but ican't acces the file. i gt error that the file is read only.