. saveWithKeyToolStripMenuItem_Click(object sender, EventArgs e) { //MessageBox.Show("Nhóm em chưa làm đư c ?"); } private void menuStrip1_ItemClicked(object sender, ToolStripItemClickedEventArgs. pastToolStripMenuItem_Click(object sender, EventArgs e) { txtnoidung.Paste(); } private void copyToolStripMenuItem_Click(object sender, EventArgs e) { txtnoidung.Copy(); } private void selectAllToolStripMenuItem_Click(object. if (colorDialog1.ShowDialog() == DialogResult.OK) { txtnoidung.ForeColor = colorDialog1.Color; } } private void backGoundToolStripMenuItem_Click(object sender, EventArgs e) { if (colorDialog1.ShowDialog()...