differrence between custom control and web usercontrol?

User controls:-

1. These controls are specific to our appication it self. i.e,  We can   not use in multiple applications.

2. It supports drag & drop the controls from the toolbox.

3. These controls does not added to the toolbox.

Custom COntrols:-

1. These controls are specific to all appication. i.e,  We can use in multiple applications by adding the .dll in u r application.

2. It does not supports drag & drop the controls from the toolbox. To create custom controls we have to write the code in html only.

3. These controls will be added to the toolbox.