What does it mean to update data in the database? We want to replace one or more column values in a table's row with new values. Entity Framework will issue an update query when it knows that an entity has changed since it was first attached to DbContext, either by viewing a LINQ query that was enumerated, or via a call to Attach method of DbSet. The simplest way to find an entity you want to update is to use a query. Then, change one or more properties to new values and call SaveChanges. From the moment we query the data, Entity Framework will start tracking changes to each property. When SaveChanges is finally called, only changed properties will be included in the update SQL operation. When you want to find an entity to update in the database, you typically look for it based on the primary key value. We already saw how to use the Where method to achieve this. Entity Framework also has the Find method exposed on DbSet. This method takes one or more values...