A Simple Linq Query to return a Record from SQL Server

Question

I have a table named Customers which contain columns like
Id   Col1   Col2   Col3   Col4   Col5
How do I write a Linq query to return the value of Col2 where Id=999

Answer 1

Hello,
It depends on what method you use to read data i.e. Data Context class, Entity Framework for SQL-Server we can get data directly from the database easily.
The following has two very simply examples using data context classes and the same came be done with Entity Framework which has an even more powerful version of data context implementation under 6 and above
Dim db As New DataClasses1DataContext
Dim theCustomer As Customer = db.Customers.Where(Function(c) c.CustomerID = 999).FirstOrDefault
If theCustomer IsNot Nothing Then
' use theCustomer which contains all columns
Else
' do not use, customer not located
End If
Dim theCustomer1 As Customer =
From c In db.Customers
Where c.CustomerID = 999
Select New Customer With
.CompanyName = c.CompanyName,
.ContactName = c.ContactName,
.Orders = c.Orders
).FirstOrDefault
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