Note
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Sometimes you may want to get entities back from a query but not have those entities be tracked by the context. This may result in better performance when querying for large numbers of entities in read-only scenarios. The techniques shown in this topic apply equally to models created with Code First and the EF Designer.
A new extension method AsNoTracking allows any query to be run in this way. For example:
using (var context = new BloggingContext())
{
// Query for all blogs without tracking them
var blogs1 = context.Blogs.AsNoTracking();
// Query for some blogs without tracking them
var blogs2 = context.Blogs
.Where(b => b.Name.Contains(".NET"))
.AsNoTracking()
.ToList();
}