Strings.Asc Method (Char)
Assembly: Microsoft.VisualBasic (in microsoft.visualbasic.dll)
Required. Any valid Char or String expression. If String is a String expression, only the first character of the string is used for input. If String is Nothing or contains no characters, an ArgumentException error occurs.
Return ValueReturns an Integer value representing the character code corresponding to a character.
For more detailed information, see the Visual Basic topic Asc, AscW Functions.
Asc returns the code point, or character code, for the input character. This can be 0 through 255 for single-byte character set (SBCS) values and -32768 through 32767 for double-byte character set (DBCS) values. For charts of the single-byte ASCII characters, see ASCII Character Codes.
The returned value depends on the code page for the current thread, which is contained in the ANSICodePage property of the TextInfo class in the System.Globalization namespace. You can obtain ANSICodePage by specifying System.Globalization.CultureInfo.CurrentCulture.TextInfo.ANSICodePage.
AscW returns the Unicode code point for the input character. This can be 0 through 65535. The returned value is independent of the culture and code page settings for the current thread.
The AscB function of earlier versions of Visual Basic returns a code for a byte, rather than a character. It is used primarily for converting strings in double-byte character set (DBCS) applications. All Visual Basic 2005 strings are in Unicode, and AscB is no longer supported.
The following example uses the Asc function to return Integer Data Type (Visual Basic) character codes corresponding to the first letter in each string.
Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.