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System.Windows.Forms.Timer t;

void Form1_KeyDown(object sender, KeyEventArgs e)
        {

            t = new System.Windows.Forms.Timer();
            t.Interval = 20;
            t.Tick += new EventHandler(pbBewegen);
            t.Start();
        }

private void pbBewegen(object sender, EventArgs e)
        {
            
            t.Stop();
            
            Random r = new Random();
           int hoehe = r.Next(1, 240);
           for (int i = 5; i < 245; i++)
           { pictureBox1.Location = new Point(i, hoehe);
           Thread.Sleep(10);
           }
           t.Start();
        }

 private void pictureBox1_Click(object sender, EventArgs e)
        {
            
            MessageBox.Show("Treffer!");
            
        }