如何使用LINQ-to-SQL回滚对WPF DataGrid控件的更改？

using System.Data.Linq;
using System.Data.Linq.Mapping;

[Table(Name = "Products")]
public class Product
{
    [Column(IsPrimaryKey = true, IsDbGenerated = true)]
    public int ProductID { get; set; }

    [Column]
    public string ProductName { get; set; }

    [Column]
    public decimal UnitPrice { get; set; }
}

public class DataContextClass : DataContext
{
    public Table<Product> Products;

    public DataContextClass(string connectionString) : base(connectionString) { }

    public void UpdateProduct(Product product)
    {
        try
        {
            Products.Attach(product, this.Products.GetOriginalEntityState(product));
            this.SubmitChanges();
        }
        catch (Exception ex)
        {
            this.CancelChanges();
            throw ex;
        }
    }
}