Data not updated to database

Question

Hi,

 

 

This is my code :

 

public NotificationData ReadNotification(int memberId, int NotificationId)
{
using (KiwiDbContext context=new KiwiDbContext(_ConnectionString))
{
NotificationData nd=new NotificationData();

nd.IsRead = true;

var query = (from n in context.Notifications where n.MemberID == memberId && n.NotificationID == NotificationId && n.IsRead == false select new NotificationData { NotificationID=n.NotificationID, Message=n.Message, CreatedTime=n.NotificationTime, IsRead=n.IsRead });
return nd;

}
} 

 

When I execute the data will be displayed but not saving to database 

 

Please give me correct code for that