file uploading into web server

hi i want to upload a file(.doc,.jpg etc..) into a web server by clicking on the browse button and selecting the file path from the local machine i have to upload the file. how can i do this (also how can i have the browse button ..so that when i will click over it it will open a dialouge box for file selection as usually in job sites where the user have to upload their cvs)i am using vb.net as code behind thanks in advance