Query Expression Syntax Examples: Element Operators
The examples in this topic demonstrate how to use the First method to query the AdventureWorks Sales Model using the query expression syntax. The AdventureWorks Sales Model used in these examples is built from the Contact, Address, Product, SalesOrderHeader, and SalesOrderDetail tables in the AdventureWorks sample database.
The examples in this topic use the following using/Imports statements:
Option Explicit On
Option Strict On
Imports System.Data.Objects
Imports System.Globalization
using System;
using System.Data;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.Objects;
using System.Globalization;
using System.Data.EntityClient;
using System.Data.SqlClient;
using System.Data.Common;
First
Example
The following example uses the First method to return the first contact whose first name is "Brooke".
Dim firstName = "Brooke"
Using context As New AdventureWorksEntities
Dim contacts As ObjectSet(Of Contact) = context.Contacts
Dim query As Contact = ( _
From cont In contacts _
Where cont.FirstName = firstName _
Select cont).First()
Console.WriteLine("ContactID: " & query.ContactID)
Console.WriteLine("FirstName: " & query.FirstName)
Console.WriteLine("LastName: " & query.LastName)
End Using
string firstName = "Brooke";
using (AdventureWorksEntities context = new AdventureWorksEntities())
{
ObjectSet<Contact> contacts = context.Contacts;
Contact query = (
from contact in contacts
where contact.FirstName == firstName
select contact)
.First();
Console.WriteLine("ContactID: " + query.ContactID);
Console.WriteLine("FirstName: " + query.FirstName);
Console.WriteLine("LastName: " + query.LastName);
}