Ben10, Johnny5, THX1138...
Health
bhaskaran7010
The username you entered contains characters that are not letters or numbers. If you entered a space or a dash (-) you'll probably get this error.
Any character which is not A-Z or 0-9. Examples of non-alphanumeric characters: !"£$%^&*()
Any character which is not A-Z or 0-9. Examples of non-alphanumeric characters: !"£$%^&*()
kabeer123,ami345,alpha12,3etc....
kabeer123,ami345,alpha12,3etc....
Alphanumeric user name would be using numbers and letters in the name. John1234 is an example. Remember that most naming conventions for websites or even some domains require strong user name/password encryption. And example would be. JohN_1234. Note the use of caps and underscore. This would less likely be able to crack or figure out by an unwanted user.
Anything that is a number or a letter is an alphanumeric character, so examples are punctuation and symbols: [, }, ~, /, *, @, and so on.
Username is the public name that you are known by. Password is a secret alphanumeric that only you know and use to gain access to a software programme, user account, web site etc.
The term alphanumeric refers to any term that is composed of letters and/or numbers, and would therefore include such things as: leep87gr231, elb7ty987ghy, and so forth. Alphanumeric terms are often used as passwords.
The user name should only contain letters in the alphabet and numbers. examples of acceptable character would include: 0123456789 abcdefghijklmnopqrstuvwxyz ABCDEFGHIJKLMNOPQRSTUVWXYZ All other characters are not accepted.