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To display an image from a path, you can use the image control. When you first add the control to your form, a wizard asks you for the image you want to display. You can choose any image file on your hard drive just to keep the wizard happy. After the wizard finishes, clear the Picture property of the image control, and reply Yes to the Do you want to remove this picture from the form warning message. Now, you re ready to write some code to pick up the path and dynamically load the picture into the image control each time the user moves to a new record. You need code similar to the following in the form s Current event procedure:

Private Sub Form_Current() Load the current image, if any, when moving to new row Dim strPath As String If on new record, If Me.NewRecord Then ... then set the message Me.lblMsg.Caption = "Click Add to create a photo for this employee." Make it visible Me.lblMsg.Visible = True

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using System.Data.Linq.Mapping; { [Table] public class Subject { [Column(IsPrimaryKey = true, Name = "ID")] public Guid SubjectId { get; set; } [Column] public String Description { get; set; } [Column] public String Name { get; set; } [Association(OtherKey="SubjectId")] public EntitySet<Book> Books { get; set; } } }

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.. and hide the image frame Me.imgEmployee.Visible = False Exit Sub End If Try to load image - set error trap On Error Resume Next If nothing in the photo text, If IsNothing(Me.Photo) Then ... then set the message Me.lblMsg.Caption = "Click Add to create a photo for this employee." Make it visible Me.lblMsg.Visible = True .. and hide the image frame Me.imgEmployee.Visible = False Else strPath = Me.Photo Check for characters that indicate a full path If (InStr(strPath, ":") = 0) And (InStr(strPath, "\\") = 0) Then Just a file name, so add the current path strPath = CurrentProject.Path & "\" & strPath End If Attempt to assign the file name Me.imgEmployee.Picture = UCase(strPath) If got an error, If Err <> 0 Then ... then set the message Me.lblMsg.Caption = "Photo not found. Click Add to correct." Make it visible Me.lblMsg.Visible = True .. and hide the image frame Me.imgEmployee.Visible = False Else Reveal the picture Me.imgEmployee.Visible = True And set the form palette so the picture displays correctly Me.PaintPalette = Me.imgEmployee.ObjectPalette End If End If End Sub

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Just like the table and columns, we need to tell the framework how the objects are related. We will do that using the Association attribute. In order for the association to work, we need to identify how our Book type is related to the Subject. We associate the two objects by specifying the property of the related object we will be joining with our current object. Our Book object contains a SubjectId property that we ve already mapped to the Subject field of the Book table in the database. Thus, for the contained Books property of the Subject class, we specify the property of the Book class that represents the key to our record is called SubjectId. This key is the OtherKey, or the key property in the related object. Now that we ve specified the relationship between the two objects, we can fetch our Subjects using a standard LINQ to SQL expression, as in listing 6.21. Instead of explicitly joining the tables, we can directly drill into the books collection of each object. To display the results, we will iterate through the Subjects. As we loop through each subject, we will nest a loop to display the names of the books that are in that Subject.

Note You can find the sample code to load a picture in the Form Current event procedure of the frmEmployees form. The sample printed here includes only the code to load the picture. The actual procedure includes additional code that tests the authority of the logged-in user and enables or disables editing accordingly. The code first checks the form s NewRecord property to see if the user has moved to a new row that won t have a picture path stored yet. If so, the code hides the image control, sets the caption of an informative label (the lblMsg control) behind the image and makes the label visible, and then exits the procedure. When not on a new row, the code checks to see if the Photo field that contains the picture path is empty. If so, it hides the image control and displays the message as though the form is on a new record. If there s something in the path, the 874

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