Using Control Characters

The backslash (\) is a special control character, also called the escape character. The character after the backslash has a special meaning, as shown in the table.

Character	Meaning
\0	Null
\b	Backspace
\t	Tab
\r	Carriage return
\n	New line
\v	Vertical tab
\f	Form feed
\u, \x	A single Unicode character when followed by a four-digit hexadecimal number
\"	Double quote
\'	Single quote
\\	Backslash

The escape sequences \u or \x are used (interchangeably) to specify a single Unicode character. For example, \x03A9 and \u03A9 both mean the Greek letter capital omega. The escape sequences \x03A3 and \u03A3 will appear as the Greek letter capital sigma, as in this example, in which a button displays a capital sigma as its text when it is clicked:


private void btnDoIt_Click(object sender, 

System.EventArgs e) 

{

char chr = '\u03A3';

btnDoIt.Text = chr.ToString();

}

You can find a complete list of the Unicode character sets and their four-digit hexadecimal representations at www.unicode.org/charts/.

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