This is a very simple question, but for moe reason I can't find an answer.
Do I take a performance hit if a foreach statement has to evaluate an
expression?
For example, consider the following:

I am still fairly new to C#.net and I sometimes make basic program design
mistakes - particularyly in the context of paying attention to OOP
principles.
At the moment I am working on an application that uses a MS Access database

One thing I encountered a problem with when porting some Java code to C# is
that some GUIs in Java all the widgets are basicaly evolved from one class
and it gives you some strange flexibility like adding any component to other
components. Like having a JList you can add ...

I am designing a 3 tier application (UI, BL, and DAL).  My UI takes user
input and populates the BL to store into a db.  Currently, I am thinking
about design an interface (service/facade) that the UI interfaces between
the BL.  I have seen examples that the UI creates and new ...

Perhaps this has been discussed elsewhere - if so, I couldn't find it.
The StringBuilder.Length property is explicitly documented as padding
the length with spaces if .Length is set to a value greater than the
current length. I'm hoping to get this behavior. However, when I set

Folks, I am reading/writing data within an XML file.  In my form I have a
label that is assigned to the UpdateDate field within the XML file.  Within
the form I update the label to a different date.  The code is below.  The
issue I'm having is that the DataBinding doesn't seem to ...

how to find the size of image in asp.net

This is a question brought about by a solution I came up with to
another question I had, which was "Dynamic object creation".  So, I'm
curious if you can dynamically cast an object.  If you have two object
which have a common base class, they can both be cast up to the base

I migrated a formerly C++ COM component to C# and I have been able to
duplicate all the old behavior except for one.
I have an enumeration property that returns a list of com objects.  Using
the ArrayList to hold the com objects ought to work.  If I add strings to

How can I add username/password authentication on my site? I have asp.net
2.0.  If the user's not logged in, that page should be displayed when I try
to go to any of the pages.
Also, how can I add a "login" timer so that the user is automatically logged

I have a system that has five programs that all communicate with each other
via Message Queues. Works well. One program is a watchdog that will make
sure the others are up and going. Currently I have it store info it gets
from when the programs check in into a DataSet (XML file). ...

I know I am going to feel really dumb when someone tells me the answer, but
at the moment, I am stumped.
What is wrong here and how can I fix it?
string id = dropDownList.ID

I have a usercontrol , the keypress and keyup/down  events do not seem to
work on the cursor keys .
How can i capture the cursor keys when my control has the focus ?
Johan

I'm working on a web application that's basically a questionaire that
consists of 8 pages.  Each page has different data that needs to be saved.  I
have to either save all the data from all 8 pages OR save nothing.
What's the best way to temporarily save this data and then insert ...

(VS2005/C#/MSSQL)
I am looking for a very efficient way to do a database lookup.
I am reading 1 to many files in a given directory. I then look up the
information based on the filename into a SQL Server database. There