namespace WinFormsApp1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void textBox1_KeyDown(object sender, KeyEventArgs e)
{
if (e.Modifiers == Keys.Control)
{
MessageBox.Show("Ctrl is pressed");
}
}
}
}
/*
run:
Ctrl is pressed
*/