public sealed class GridRowSelectionEventArgs : EventArgs

Public NotInheritable Class GridRowSelectionEventArgs
	Inherits EventArgs

public ref class GridRowSelectionEventArgs sealed : public EventArgs

[<SealedAttribute>]
type GridRowSelectionEventArgs =  
    class
        inherit EventArgs
    end

grid.SelectionChanging += delegate(object sender, GridRowSelectionEventArgs e)
{
    //The first row will always be selected
    if(e.Row.VisibleIndex == 0)
    {
        e.NewSelectionState = true;
    }

    //The second row will always be unselected
    if (e.Row.VisibleIndex == 1)
    {
        e.NewSelectionState = false;
    }
};