使用try- catch

Question

就是非常普通的地方啊 没特殊的 啊
/// <summary>
        /// 修改通讯录
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button2_Click(object sender, EventArgs e)
        {
            try
            {
                if (dataGridView2.Rows.Count > 0)
                {
                    GroupManage groupManage = new GroupManage();
                    //标识当前是修改通讯组
                    modifyFlag = 1;
                    Frm_AddGroup frm_AddGroup = new Frm_AddGroup();
                    frm_AddGroup.modifyData += new Frm_AddGroup.TellMessageFormModify(this.getColumn);
                    //记录当前要修改分组的信息，在Frm_AddGroup中显示对应的信息
                    frm_AddGroup.groupCurrent = groupManage.getGroupByInfo(tmpcorperid, currentGroupName, currentGroupType);
                    frm_AddGroup.ShowDialog();
                }
                else
                {
                    MessageBox.Show("未选中任何通讯组");
                }
            }
            catch (NullReferenceException)
            {
                MessageBox.Show(LoginInfo.networkMessage);
            }
            catch (Exception)
            {            }        }

Answer 1

try
{
}
catch
{
}
finally
{
}

Answer 2

可以。但是，也不用try完catch 2次吧？