Do I need Framework on client machine as well? I want an alternate way of VB OCX downloadable control to replace with .NET user control. Please advice... Thanks

For client/server applications, unlike OLE/ActiveX/OCX, with EasyXLS your users don't need to install ANY framework or control. This is because EasyXLS is a server-side component.
EasyXLS makes your job a lot easier by providing your users/clients with the complete finite output, such as a formatted Excel spreadsheet.