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Master detail relations in Linq to sql

Posted on 2009-04-15
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Last Modified: 2013-11-11
how to build that? in datatables I used to have something like this: (code bellow)

msBindSource.DataSource = ds
        msBindSource.DataMember = msDt.TableName
        rgridview.DataSource = msBindSource
        
        detailBindSource.DataSource = msBindSource
       detailBindSource.DataMember = "msRelationStr" -> that is the relation name

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Question by:TheSilverBullet
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Fernando Soto earned 400 total points
ID: 24154581
Hi TheSilverBullet;

The best way to do a Master/Detail with Linq to SQL is to let the IDE environment build the underneath plumbing for you. I will use the Microsoft Northwind database to show how to do it.

1. Add a Linq to SQL Class to your project.
2. Once the designer is displayed add the Orders and Order_Details table to the design surface.
3. Save and compile the project.
4. Add a DataSource object to your project By clicking on the Menu -> Data -> Add New DataSource.
5. In the DataSource Window select Object and click on the Next button.
6. Expand the Project Name node and then Expand the node with the Project Name again.
7. Now select the Master table name, in this case it is Orders.
8. Click on the Finish button.
9. Open the DataSource window if it is not already displayed.
10. Drag the Orders table on to the form. This will add one BindingSource component named OrdersBindingSource and a BindingNavigator called OrdersBindingNavigator as well as the Master DataGridView with all plumbing connected for you.
11. Now drag the Order_Details table on to the form from the DataSource window. This will add a BindingSource component called Order_DetailsBindingSource to the form and the Details DataGrridView.
12. Now query the data source as shown in the code snippet below and that is it.
13. Run the project.

Fernando
Public Class Form1
 
    Private Sub Form1_Load(ByVal sender As System.Object, _
        ByVal e As System.EventArgs) Handles MyBase.Load
 
        Dim db As New NorthwindDataContext()
 
        OrdersBindingSource.DataSource = From order In db.Orders _
                                         Select order
 
    End Sub
 
End Class

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