User461194179 posted
Hi,
Composite Controls are some what similar to User control, so you can use them the same way as user controls. Major difference is Composite Controls generate dll. where as user controls are text files.
Read it for difference
http://msdn.microsoft.com/en-us/library/aa719735(VS.71).aspx
Steps include
1.Add reference to them on aspx page
2. Use Register directive and Register the control
3. Add tag and start using it.