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private void button1_Click(object sender, EventArgs e)
{
ContextMenuStrip cms = new ContextMenuStrip();
cms.Items.Add("MenuItem 1");
cms.Items.Add("MenuItem 2");
cms.Items.Add("MenuItem 3");
cms.Items.Add("MenuItem 4");
cms.Items.Add("MenuItem 5");
cms.Show(
(sender as Button),
(sender as Button).PointToClient(Cursor.Position),
ToolStripDropDownDirection.AboveLeft);
}