scan document from scanner when i click button save in pdf f

You can use WIA (COM interop) to scan images using .NET without the need of 3rd party components

http://www.codeproject.com/KB/dotnet/wiascriptingdotnet.aspx

There are a number of high quality 3rd party components that match the original posters requirements:

http://www.accusoft.com/

http://www.gdpicture.com/

http://www.atalasoft.com/products/dotimage