avoid datagrid rows getting multiplied on selecting a row in master-detail scenario

Question

4.00/5 (1 vote)

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I have Master-Detail `datagrid` in my application created using `Linq to Entities`. I would like to display the selected row's deatils of the Master datagrid on the details datagrid.

what I have tried :

C#

private void Page_Loaded(object sender, RoutedEventArgs e)
   {
       this.db = new DB_ProdEntities();
       var serverQuery = from a in this.hmdb.Servers
                         orderby a.ServerID
                         select a;
     dgServer.ItemsSource = null;
     dgServer.ItemsSource = serverQuery;
 }
 private void dgServer_SelectionChanged(object sender, SelectionChangedEventArgs e)
   {
       string serverID = (dgServer.SelectedItem as Server).Name;

       var componentQuery = from a in db.Components
                            where a.ServerID == serverID
                            orderby a.Name
                           select a;
     dgComponent.ItemsSource = null;
     dgComponent.ItemsSource = componentQuery;
   }

OUTPUT:

when I select the first row everything is normal, but when I select the second row it displays the details along with the selection of the first row's details like this

how to overcome this problem?

Output 1-
http://postimg.org/image/9x1f616n7/[^]

output 2
http://s16.postimg.org/4nylei9ph/op2.png[^]

Posted 16-Apr-13 2:01am

BuBa1947

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babu saravanan · Accepted Answer · 2013-04-16T06:35:00

Please try this code

C#

private void Page_Loaded(object sender, RoutedEventArgs e)
        {
if(! IsPostback)
{
            this.db = new DB_ProdEntities();
            var serverQuery = from a in this.hmdb.Servers
                              orderby a.ServerID
                              select a;
          dgServer.ItemsSource = null;
          dgServer.ItemsSource = serverQuery;
}
}
private void dgServer_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
     string serverID = (dgServer.SelectedItem as Server).Name;

            var componentQuery = from a in db.Components
                                 where a.ServerID == serverID
                                 orderby a.Name
                                select a;
          dgComponent.ItemsSource = null;
          dgComponent.ItemsSource = componentQuery;
}