How do I use the speel check on text box?

example,the users can't use the name like a sign or any bad words. ex : # 123 ☺ ♣ ♠ - + = > < . / , ' " ; : [ ] { } |\` ~ dog,sh*t,and other bad words.

i want it maked like a sensor code.

anyone can make it? or explain it?

anyone can help?

Google would probably help you more, as the mechanics of doing a spell check mechanic are not application specific.

So for instance, the general way to allow only alphanumeric characters is to use regular expression.

A foul language filter would probably entail maintaining a list of words in an array along with the 'clean' substitute.