Answer / gupta

1.server controls are dll's and placed in toolbox,
1.user controls are pages and it have an extexsion .ascx.
It does not placed in toolbox.
2.User controls are more simple to create
2. but custom controls are more simple to use.

Answer / abhinay kumar

custom controle is inbuild control where as user control
which are created by us as our requirement.
to make a user control .net provide a file which extention
is ascx.

Answer / janardan baghla

The main difference is that a seperate copy is generated of
user controls whereas only single copy of custom control is
shared.

Answer / satish

user controls executed on each user separately and at client
side only, where as custom controls executed on server side
and only one copy for any number of users

Answer / guest

There are two main categories of creatable Web controls.
User controls are more simple to create, but custom
controls are more simple to use. The extra effort that goes
into creating custom controls pays off for the developer
using the control at design time.

User controls are saved with an ASCX file extension.
Although they can be easily reused on any of the pages
within the project in which they were created, there is no
good way to reuse them in a different project. Another
downside to user controls is that they only appear on the
page at run time; at design time they appear on the page as
an ugly gray box, making it difficult to envision how
they'll appear to your users.

Custom controls can do everything that user controls can
do - and much more. The biggest drawback is that they are
more challenging and complex to create. Drag and drop is
not supported for the creation of these controls.
Therefore, all the HTML they output must be generated via
code. Pretty much all the articles & controls on this web
site are examples of custom controls. In addition to run-
time functionality without limits, custom controls support
rich design-time functionality. They can appear on a page
at design time the same way they'll appear at run time, or
differently if preferred. They can be adjusted to change
how they'll appear in the toolbox, and how the properties
will appear in the properties window. If the properties
window doesn't support the desired functionality, it can be
extended with custom popup dialog boxes and other UI
tricks. Custom controls are easily distributed and can be
enhanced with help documentation and licensing
functionality, allowing them to be sold to other developers.

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