Hi Vidhyadhar,
take a look at the size of your data file and the log file
The data file has the 10 GB Limit.
If your DB is that much larger, then I suppose that you're running the database in Full Recovery mode without taking log backups.
So you need to take care of a proper backup which includes Full database backup as well as T-Log backups.
Maybe you take a look at the maintenance solution Ola Hallengren provides. There are examples how to set it up for SQL Srv Express as well.
Regards
Dirk