Expert Suggestion Needed For A Asp Based Web Application

We have a couple of web applications where data is updated on a weekly
basis. The data entry is done in a vb access application which is kept
internal. The database is uploaded to the web which has a web interface for
clients to check their records. Thus dat a gets updated once a week.

In a new application, I would like to build a single web based application,
where the data entry is done from the same application and clients would look
up their records from the web. The clients should have only read access. In
other words, I would like to do the system real time. My question is whether
I would face any problem when somebody needs to edit a record while a client
wants to read record.