How to test if the user pressed the Enter Key?

You can display the value of the key pressed with this line:

MessageBox.Show("The value of the key pressed is " + ((int)e.KeyChar).ToString());

Notie that you need to cast e.KeyChar to 'int' otherwise it will just display as the character itself if it is printable.

Here's a table showing the ASCII values of  the various keys (C# uses Unicode but the first 128 values are the same). You'll notice that 'carriage return' corresponds to 13:

http://www.asciitable.com/

thanks, but if I want to display the char code? For example, when the enter key is pressed, the value 13 is displayed, when the shift key is pressed, another value is displayed, I mean how do u get the value of the key (13 is for enter)?

Thank you

To test for the enter key you can use:

if (e.KeyChar == (char)13)
{
  // do something

}