给dataGridView1加了个右键菜单，菜单项里分别是添加，删除，修改3个操作，我想在点击不同操作时候，show出来的界面是同一个，但是监听（的事件却不同）添加的事件，ShowDialog出来界面上文本框内容全要填写。而删除和修改界面上的文本框要获得取值（比如说，我要根据姓名删除）

private void tsmiAdd_Click(object sender, EventArgs e)
        {
            //CustInfo info = new CustInfo();
            //ToolStripMenuItem
            //info.Show();
            if ((sender as ToolStripMenuItem).Text.Equals("添加"))
                MessageBox.Show("添加");
        }

        private void tsmiDel_Click(object sender, EventArgs e)
        {
            if ((sender as ToolStripMenuItem).Text.Equals("删除"))
            {
                DataRowView drv = (DataRowView)this.BindingContext[this.dataGridView1.DataSource, this.dataGridView1.DataMember].Current;
                CustInfo info = new CustInfo(drv);
                info.Show();
            }
        }

        private void tsmiModify_Click(object sender, EventArgs e)
        {
            //if ((sender as ToolStripMenuItem).Text.Equals("修改"))
            //    MessageBox.Show("修改");
            MessageBox.Show((sender as ToolStripMenuItem).Text);
        }