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Attach(_Employee, true); or Using context As New db Students(str Conn String) Dim tmp Student = (From p In context.

Over the last few months I wrote a series of blog posts that covered some of the new language features that are coming with the Visual Studio and . LINQ supports a very rich extensibility model that facilitates the creation of very efficient domain-specific operators for data sources. NET Framework ships with built-in libraries that enable LINQ support against Objects, XML, and Databases.

LINQ-enabled languages can provide full type-safety and compile-time checking of query expressions, and development tools can provide full intellisense, debugging, and rich refactoring support when writing LINQ code.

Recently, I have discussed about getting started linq to sql in c#

That articles also covered for creating select query for retrieving both single and multiple results.

Guid Get Return _student_id End Get Set(value As System. Property Changing Public Event Property Changed As Property Changed Event Handler Implements System. Property Changing Event Is Nothing) = False) Then Raise Event Property Changing(Me, empty Changing Event Args) End If End Sub Protected Overridable Sub Send Property Changed(By Val property Name As [String]) If ((Me.

INotify Property Changed Private Shared empty Changing Event Args As Property Changing Event Args = New Property Changing Event Args(String. Guid Private _first_name As String Private _last_name As String Private _email As String Public Sub New() End Sub #Region "Properties" _ Public Property student_id() As System. Property Changed Protected Overridable Sub Send Property Changing() If ((Me.

Or you did nothing the the auto-generated file contents but the error is thrown out?

Submit Changes() Hello cppvb：） Have you modified the LINQ generated file's contents?

If you know the keys involved in the relationship you can explicitly set the Foreign Key field eg .

However, you do not always know the key, especially if the record has just been created, so you can actually link two objects together and LINQ-to-SQL will work out the keys for you.