LINQ to SQL does not update when data has changed in database

I have this problem where after a field (say Field3 in table MyTable) is updated on the database, MyTable.Field3 (in C#) is still returning the old value.

I suspect there is some caching...?

How do I force it to:
Read the value from the database?
OR
Update the value in the MyTable class?

Or is there anything I miss? I am new to LINQ

Thank you in advance.