linq to update table

Question

In a C# 2010 application I would like to be able to use linq instead of sql to update from to 1 to 6 specific columns in a table

that is stored in  sql server 2008 r2 database. I am asking that question since I know linq is the preferred method over using sql.
I do know what the key to the table is.

Thus can use tell me how to acdcomplish this goal?