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how to read and update. Now, let s take a look at the other two parts of the CRUD operation: create and delete. Typically when working with collections, we d add and remove objects by using IList s Add and Remove methods. The traditional semantics of Add and Remove imply that the collections immediately reflect the new values. Preview releases of LINQ continued the tradition of using Add and Remove for these functions. However, users were confused when their values were not returned as part of subsequent queries until they were committed to the database. As a result, the names for these methods were changed to InsertOnSubmit and DeleteOnSubmit to reflect the nature of the implementation more accurately. Creating new items with LINQ to SQL is as simple as calling the InsertOnSubmit method on the table object. To delete, we similarly call the DeleteOnSubmit method. Listing 6.29 demonstrates adding a book to our book collection and subsequently removing it.

Figure 23-16.

Automating Your Application with Visual Basic The bulk of the work happens when you click the Search button. The code for the event procedure for the Click event of the Search button is shown below.

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Private Sub cmdSearch_Click() Dim varWhere As Variant, varDateSearch As Variant Dim rst As DAO.Recordset Initialize to Null varWhere = Null varDateSearch = Null First, validate the dates If there s something in Contact Date From If Not IsNothing(Me.txtContactFrom) Then First, make sure it s a valid date If Not IsDate(Me.txtContactFrom) Then Nope, warn them and bail MsgBox "The value in Contact From is not a valid vbCritical, gstrAppTitle Exit Sub End If Now see if they specified a "to" date If Not IsNothing(Me.txtContactTo) Then First, make sure it s a valid date If Not IsDate(Me.txtContactTo) Then Nope, warn them and bail MsgBox "The value in Contact To is not a valid vbCritical, gstrAppTitle Exit Sub End If Got two dates, now make sure "to" is >= "from" If Me.txtContactTo < Me.txtContactFrom Then MsgBox "Contact To date must be greater than " "or equal to Contact From date.", _ vbCritical, gstrAppTitle Exit Sub End If End If Else No "from" but did they specify a "to" If Not IsNothing(Me.txtContactTo) Then Make sure it s a valid date If Not IsDate(Me.txtContactTo) Then Nope, warn them and bail MsgBox "The value in Contact To is not a valid vbCritical, gstrAppTitle Exit Sub End If End If End If If there s something in Follow-up Date From If Not IsNothing(Me.txtFollowUpFrom) Then First, make sure it s a valid date If Not IsDate(Me.txtFollowUpFrom) Then Nope, warn them and bail

date.", _

DataContext dataContext = new DataContext(liaConnectionString); Table<Book> books = dataContext.GetTable<Book>();

date.", _

date.", _

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Book newBook = new Book(); newBook.Price = 40; newBook.PublicationDate = System.DateTime.Today; newBook.Title = "Linq In Action"; newBook.PublisherId = new Guid("4ab0856e-51f3-4b67-9355-8b11510119ba"); newBook.SubjectId = new Guid("a0e2a5d7-88c6-4dfe-a416-10eadb978b0b"); books.InsertOnSubmit(newBook); dataContext.SubmitChanges(); books.DeleteOnSubmit(newBook); dataContext.SubmitChanges();

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If we check the generated SQL code, we will see that the code to insert a record is a simple INSERT INTO statement. The code to delete the record is a bit more complex than a simple DELETE FROM Table structure. The extra code is required to handle potential concurrency issues. We can perform all of the standard CRUD

MsgBox "The value in Follow-up From is not a valid date.", _ vbCritical, gstrAppTitle Exit Sub End If Now see if they specified a "to" date If Not IsNothing(Me.txtFollowUpTo) Then First, make sure it s a valid date If Not IsDate(Me.txtFollowUpTo) Then Nope, warn them and bail MsgBox "The value in Follow-up To is not a valid date.", _ vbCritical, gstrAppTitle Exit Sub End If Got two dates, now make sure "to" is >= "from" If Me.txtFollowUpTo < Me.txtFollowUpFrom Then MsgBox "Follow-up To date must be greater than " & _ "or equal to Follow-up From date.", _ vbCritical, gstrAppTitle Exit Sub End If End If Else No "from" but did they specify a "to" If Not IsNothing(Me.txtFollowUpTo) Then Make sure it s a valid date If Not IsDate(Me.txtFollowUpTo) Then Nope, warn them and bail MsgBox "The value in Follow-up To is not a valid date.", _ vbCritical, gstrAppTitle Exit Sub End If End If End If OK, start building the filter If specified a contact type value If Not IsNothing(Me.cmbContactType) Then .. build the predicate varWhere = "[ContactType] = " & Me.cmbContactType & " " End If Do Last Name next If Not IsNothing(Me.txtLastName) Then .. build the predicate Note: taking advantage of Null propagation so we don t have to test for any previous predicate varWhere = (varWhere + " AND ") & "[LastName] LIKE " & _ Me.txtLastName & "* " End If Do First Name next If Not IsNothing(Me.txtFirstName) Then .. build the predicate varWhere = (varWhere + " AND ") & "[FirstName] LIKE " & _ Me.txtFirstName & "* " End If Do Company next If Not IsNothing(Me.cmbCompanyID) Then

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