Customization of ASCX user controls

We have a little situation thats kinda got out of hand latly. Our web application is built upon several ASCX user controls. All of them is available to customize (pointing to another ASCX-path). What we do when we customize is to make a copy of the source ASCX and make some changes.

Now the problem, when there have been much commits to the source ASCX the customzied copy is way behind the source ASCX and much work has to be done manually to get them 开发者_JS百科in par.

We have a winforms application that have similar technique for customizing but its no problem there because of the degsin inheritance of usercontrols.

Anyone know a better way to customize web controls that dont make so much problems when rebuilding?

• Use inheritance there, too.
• Dont use ascx but real controls and a skinning framework.
• Dump user controls, go MVC. Then the views are not containing any significant logic, so the maintenance of customized stuff is easier.