.dwp- Sharepoint Web parts-System.Web.UI.WebControls.WebParts.WebPart
Cross page connections
Connections between Web Parts that are outside of a zone
Client-side connections (Web Part Page Services Component)
Data caching infrastructure, including the ability to cache to the database
All above feature can’t do using Dot net web part.
.webparts- Dot net webparts-Microsoft.SharePoint.WebPartPages.WebPart
