Someone can explain me the meanings of the ? operator applied to
declarations like that i found...
private Point? startPoint;
if i delete the ? the compiler gives me some errors but i don't understand

I have a situation where I have an object name as a string, and a method as
a string.  I need to construct a click handler with those two bits of
information.  This is what I came up with so far... and the error message I
am receiving...

I'm trying to find resources on GUI programming and C#. I find that the
default WinForms aren't aesthetically pleasing. I already have all the
software to make GUIs (Photoshop and Fireworks). Just trying to figure out
the part that replaces the default WinForms look.

So I am new to the world of multi-threading. My multithreading
application works, however I want the application to run the commands
post-foreach loop after each thread has completed.
Lets say there are 10 threads. How can I create a wait after the

When I try to access a SQL Saved view calleed FilteredLead I do not get
anythin back on asp.net if I run same SQL command on the SQL Editor I get
all my results. Is it any way to use views in C# diffrent than tables ?
See my code

I have classes A,B,C,D,E,F that implement InterfaceBase.
Whats the best way to down cast obj to the correct type?
Is there a more elegant way to do this than?
Public Void DoSomething(InterfaceBase obj)

Whats the best way of implementing authorization in a win forms
application.
I mean things like  show/hide or enable/disable Save button ,creating
context menus  etc.

I want to deploy my managed COM object (DLL, .NET 2.0) using ClickOnce
Deployment.
In the project properties, tab "Signing" the checkbox "Sign the ClickOnce
manifest" is disabled.

VB had a "line" control, just a simple line that let you separate
controls without the wasted space of a Groupbox.  Did CSharp drop
this?
Dom

Why this piece of code doesn't compile?
public class FStorage
{}
public class FSExcel : FStorage

1st    I serialize a DataSet (contains 14 DataTables) into file, with
BinaryFormatter.
2nd   I change some columns in a DataTable.
3rd    When I now Deserialize the DataSet from bin file got I problems ??

I've just started using the 'using' keyword for database connections
etc.  Is it not possible to use try catch blocks with using? And if so,
how do you trap errors when using using?

I have a strange problem. Here is some input data before I describe
the problem.
1. RemoteClass (Mathematica) is compiled into dll and put to GAC
2. Server remoting configuration is done by code.

I have a 200x200 PNG file which has an Alpha layer.
What I would now like is a 200x200 image that is completely black, but with
the same alpha mask.  This is so that I can use it as a drop shadow behind
the PNG when drawing to a target image.

I have Multi-threaded TCPListener.
I can connect to listener from local sistem and remote sistem.
I turned it to windows servis.
I can connect to listener via telnet from local sistem but i can't connect