I have a DataTable that looks like this:
Id Value
123 4.0
123 5.0

I have a ListBox which is binded to a dataSet. When I need to refresh
this dataSet, it works, but the old entries don't get removed from the
listbox. Items.Clear() doesn't work when a DataSource is set.
How would I clear all the items from the ListBox before refreshing the

I want to create a method that takes in the type of a Enumeration,
passes in the Enumeration as an object, and then outputs the values
with checkboxes, and pre-checks the checkbox if that value is set in a
mask.

Do i need to use a special class if i need to code on computer with
multiple processors. I need to make sure that all of the CPU resources
are used to process the code. Is there a way to do this?
thank you,

I have created a simple custom control, which displays a string data
on it. It draws the string at its OnPaint(). When the string is
changed I can call Invalidate() to redraw the string. Sort of simple.
But I guess it might not be efficient. The instances of my custom

I need to add headers to a existing xls file.Then after that i can
update my dataset into the xls file.Can you explain how i could do
this.

c# vs 2008
what's the best way...
need to apply changes to  some methods in many source files (C#.cs).
(Pseudocode) here is how is done manually:

Using .NET 3.5, I need to pass an array of structs as parameter to a C++
 unmanaged function.
The C++ dll stores some data in an unmanaged cache, the function writes
the values into the array of structs. The array of structs are allocated

Where do I find the unicode values for math operators like equal,
minus and plus sign and how to I check if the value of a byte array is
one of these operators? I populate the byte array from a filestream
object using the Read method. So far  Ihave been working with utf8

I have a List of person objects using Generics. Each person will have
an Id, firstname and may have a DepartmentId
I am trying to convert this list to xml. However if the person doesnt
have a departmentId, I dont want to write out a departmentId

Hi, i am a new bie in programming.I am  currently doing a project
that displays certain hierarchial set of data in tree view.I currently
implemented this tree view to be displayed in xml file  which is one
of my requirement too.But, the point that i am confused is with

How to do pagination for a DataGridView in a Windows Forms
application? Please help me.
Thank you,
Venu.

Is there a common way to embed a graphic or icon into a label?  I want
to have something like "Press <<IMGBTN1>> To Continue" or "Press
<<IMGBTN2>> For Help".
Normally I'd just create a graphic for the whole string, but this will

I have a perplexing situation. I am using Visual Studio 2005 SP1 and
have created a simple form with two or three textboxes on them. They
are not multi-line text boxes. I would like the behavior of them to
advance to the next control when Tab or ENTER is pressed. However I

I would like to know if there is a way to validate xml file using xsd or
some other way for the following case:
Xml element represented by string value which need to be validated
against some strings domain . For example the element can be pnly one of