check whether the @ exists

i am working on a visual basic project and i have the following problem. i use a textbox were users enter their email address. i want to check whether the @ symbol exists in the textbox.
how can this be done?

ever heard of Google?
Try "visual basic check for valid email"

Your search - "visual basic check for valid email" - did not match any documents.

Without knowing (/remembering) anything of VB, the easiest way would be to run through the text string character by character, and check if there is an '@' in there, and that somewhere after it, there is a '.' followed by 2 to 4 characters.
That will be a better way than most programmes does it, as they usually accept "you@re.stupid" or similar adresses.
Of course, it takes more cpu cycles, but still..

the easiest way would be to run through the text string character by character, and check if there is an '@' in there, and that somewhere after it, there is a ',' followed by 2 to 4 characters.
That will be a better way than most programmes does it, as they usually accept "you@re.stupid" or similar adresses.
I did this recently in one PHP code I had to do. There are a lot of allowed characters in the address before @ and in the domain after it, it's just that too many e-mail applications aren't designed to handle "international" characters.

Furthermore, it's not just two to four characters allowed in domain, and I presume you meant a dot instead of a comma. There can be any number of dots in the domain address, as far as I know (zero could be localhost, for example; two are used in many countries, .co.uk, .co.jp etc.). One simple way would be to check if the domain exists in DNS records.

Besides, top-level domains can have more than four characters, for example http://about.museum is a valid URL.

See also: RFC822: Standard for ARPA Internet Text Messages (http://www.w3.org/Protocols/rfc822/)

Ok, I admit it, I'm somewhat tired, and my fingers aren't hitting all the right keys at the right time... Yes, I meant 'dot' not comma.

As for checking for the dot, I didn't mean there should only be one, I only meant you should check that there is a dot at the end followed by up to a certain amount of characters. But I was wrong about the amount of characters there can be in a top leve domain.

What could be done is to retrieve a list of top level domains every now and again and compare against that. Checking for if it is a complete valid domain would take some time, and would increase the complexity of the program by quite a bit. Though it is a good idea.

As for international characters, I know, and I'm pretty pissed off there is so little support. I've got a nice little domain name, but it contains an international character, and since neither IE nor outlook supports that at present, there is no use for it... But in a couple of years, hopefully...
Anyways I digress...

Your search - "visual basic check for valid email" - did not match any documents.

My Google search results: Results 1 - 10 of about 11,000,000 for visual basic check for valid email. (0.57 seconds)

http://www.freevbcode.com/ShowCode.asp?ID=1754
http://msdn.microsoft.com/library/en-us/vbcon/html/vbwlkWalkthroughValidatingUserInputInWebFormsPage.asp?frame=true
http://www.planet-source-code.com/vb/scripts/ShowCode.asp?lngWId=8&txtCodeId=1316
etc., etc.

thanks for the tip guys