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nice idea, especially thinking of people using a TV remote control. Coding is easy - doing it like this you can search both ways:

Using lookup table (not complete here) mapping numbers to keys:

[code]        protected static String [] aCode = new String[3] { "2", "22", "222" };

        protected static String [] aLetter = new String[3]{"a", "b", "c" };

[/code]and changing thes earch to look for sSearch instead of sKey, with sSearch being

[code]            String sSearch = sKey;

            int nCode = Array.BinarySearch( aCode, sKey );

            if ( nCode >= 0 )

            {

                sSearch = aLetter[ nCode ];

            }

            ....

            if ( strLabel.StartsWith(sSearch) )

[/code]