EventArgs

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中EventArgs处这两个代码不一样的呢？
    protected void DetailsView1_ItemUpdated(Object sender, System.Web.UI.WebControls.DetailsViewUpdatedEventArgs e)
    {
        GridView1.DataBind();
    }

    protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
    {
        DetailsView1.ChangeMode(DetailsViewMode.ReadOnly);
    }

  protected void GridView1_RowDeleted(object sender, GridViewDeletedEventArgs e)
    {
        if (e.Exception != null)
        {
            ErrorMessageLabel.Text = "Failed to DELETE due to foreign key contstraint on the table.  You may only delete rows which have no related records.";
            e.ExceptionHandled = true;
        }
    }