Lightswitch: Get multi-selected items from DataGrid

This allows you to access all the selected items in the grid instead of just one (the SelectedItem property)

private const string Grid = "gridname";
private DataGrid _gridControl = null;

partial void Screen_InitializeDataWorkspace(List<IDataService> saveChangesTo)
{      
    this.FindControl(Grid).ControlAvailable += 
                     new EventHandler<ControlAvailableEventArgs>(Grid_ControlAvailable);
  
}

void Grid_ControlAvailable(object sender, ControlAvailableEventArgs e)
{
    _gridControl = e.Control as DataGrid;
 
    if (_gridControl != null)
        _gridControl .SelectionMode = DataGridSelectionMode.Extended;
}

partial void SomeAction_Execute()
{     foreach (ObjectName e in _gridControl.SelectedItems)     {         ...    
    } 
}