Database Reference
In-Depth Information
Figure 19-12.
Displaying the PublishCurrency form
How It Works
Because you are working with an Entity Data Model, you do not need to deal with
SqlConnection
,
SqlCommand
, and so forth. Here you create an object referencing the
EntityContainer
named
AWCurrencyEntities
, which refers to the entire connection string that is stored in the
App.config
file.
AWCurrencyEntities currContext = new AWCurrencyEntities();
After specifying the object to
EntityContainer
, it's time to loop through the object set that is
composed of
EntityContainer.EntitySet
, thus including the name of the EntityContainer object, which
represents the
EntityContainer
, suffixed with
EntitySet
.
Note
The
EntityContainer
element is named after the database schema, and all “entity sets” that should be
logically grouped together are contained within an
EntityContainer
element. An
EntitySet
represents the
corresponding table in the database. You can explore the names of your
EntityModel
objects under the
ConceptualModel
element of the
.edmx
file, as shown in Figure 19-10.
foreach (var cr in currContext.Currencies)
{
txtCurrency .AppendText(cr.ModifiedDate.ToString());
txtCurrency.AppendText("\t\t");
txtCurrency.AppendText(cr.CurrencyCode.ToString());
txtCurrency.AppendText("\t\t");
txtCurrency.AppendText(cr.Name.ToString());
