C#

private void MyButton_PreviewKeyDown(object sender, PreviewKeyDownEventArgs e)
        {
            if (e.KeyData == Keys.Tab)
                MessageBox.Show("Tab");//Your code goes here!!
        }

Regards

static void Sort(string[] ports)
{
	int[] portsNumber = new int[ports.Length];
	
	for (int i = 0; i < ports.Length; i++)
		portsNumber[i] = int.Parse(ports[i].Replace("COM", ""));

	Array.Sort(portsNumber);

	for (int i = 0; i < ports.Length; i++)
		ports[i] = "COM" + portsNumber[i].ToString();
}

<br />
string[]  strPort=new string[] {"COM1","COM20","COM21","COM11","COM17","COM18","COM19","COM7"};<br />
            string strTemp = "";<br />
            for(int i=0;i<strPort.Length;i++)<br />
                for (int j = 0; j < i; j++)<br />
                {<br />
                    if (Convert.ToInt32(strPort[i].Substring(3)) < Convert.ToInt32(strPort[j].Substring(3)))<br />
                    {<br />
                        strTemp = strPort[j];<br />
                        strPort[j] = strPort[i];<br />
                        strPort[i] = strTemp;<br />
                    }<br />
                }<br />