Deleting Unused Webparts from Central Administrator

Deleting Unused Webparts from Central Administrator

http://yoursite/_catalogs/wp/Forms/AllItems.aspx there identify the webparts and delete those are not useful.

for customtemplate [it was created before Visual WebPart introduced] You can find it on your site's web config file.You comes to know the folder under _control template used to store the custome webpart.Delete those .ascx file and its. dll.You can find it on "BIN" folder of your site I mean [C:\Inetpub\Virtual Directories\PortNumber\BIN] and remove those entries from web.config and restart your IIS.