User controls and Custom controls in .net?

User controls and Custom controls in .net?

Custom Control

1. The purpose of it is to enhance the existing control,
2. It supports theming for consumers, which means the consumers can style it in whatever way they like,
3. It is perfect to be 3rd-party control, especially because of point 2.

4.It can be represented in the form of .dll extension.

User Control

1. Its purpose is to compose controls into one piece,
2. It does not support theming for consumers. Therefore, the consumers can not restyle it,
3. It better stay with the consumer application in case the consumer needs to change its style somehow.

4.It can be represented in the form of .ascx extension.