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how check a validated Email Exist Or Not Without Sending test Email by c# codes?

how can we check that a validated Email exist Or Not Without Sending test Email by c# codes?
we can check Validation of that email by many ways...
but what about existence?
is it possible to do that or not ?
thanks in advance

You should look at these websites. I've used a similar method to these three in the past when validating users emails for a federal website that required an authentic email address.
http://tools.email-checker.com/
http://verify-email.org/
http://www.technixupdate.com/check-whether-an-email-id-is-valid-or-not/
A mail server will usually quickly send back a response telling you if the email is valid or not, that is what you're going to be looking for.
As well, SO already has a few posts on this:
Checking if an email address exists
is one of them.
Update:
I love the existence tag...!

You could possibly use C# to run a cmd command - telnet. Then output the results to a text file and read them into to your C# app. This should help - http://www.webdigi.co.uk/blog/2009/how-to-check-if-an-email-address-exists-without-sending-an-email You will need to know the details for the mail server names though. You might be able to do this directly from C# but I have only done it through telnet.

I don't know if there's a good way to do what you're looking for, but a solution that might get you part of the way there is to ping the domain to at least make sure that exists.
Here's an MSDN link which explains how to ping from .NET:
http://msdn.microsoft.com/en-us/library/system.net.networkinformation.ping.aspx

You can use a Regex Validation on the form before the user submits the data. It's an inbuilt tool in Microsoft Visual Studio where you can pretty much drag and drop :)
You should be able to find it in the validation section . Regular expression Validator

What can I use to let users build their own avatar character?

How would you go about providing users with the ability to build a custom avatar character, something like Yahoo! Avatars?
EDIT - Let me be more specific about what Yahoo! Avatars does:
It lets you create an avatar by selecting a face, hair style, eyes, etc.
This is what I'm looking for.
I am interested in:
Libraries, free or paid
Outsourcing to an external website, provided this can be well integrated into our website
Any other suggestions

There are many web sites that let users build "cartoon character" or 3D rendered characters for avatars, but most sites don't allow users to use those avatars on other web sites. This one does: http://www.moeruavatar.com/index_en.shtml, but it's up to the user to save the generated image and upload it to other web sites. I don't know of any ready-made libraries of code you can install on your server to get such functionality on your own web site.
Suggestions for general avatar image / userid or email association:
Gravatar. http://en.gravatar.com/
Identicon: http://en.wikipedia.org/wiki/Identicon, http://identicon.codeplex.com/
Wavatar
MonsterId
Gravatar is a web service. Identicon is an algorithm you can implement locally on your server if you prefer. The last two are kinda funny but I don't think I'd ever use them.

There's also My Avatar Editor which makes Wii-style (and Wii-compatible) avatars. It's Flash based and it's on googlecode with a MIT-license.

Try a Globally Recognized Avatar, or Gravatar.
http://en.gravatar.com/
Allows users to register and site developers to access Gravitars.

Gravatar.com
deviantart.com
MonsterId
www.dressupgames.com/avatars
Good luck!

Flash plugin that allows users to create a PDF or image file

I am developing a ASP.NET web site where users will need to be able to create their own business cards. So, I'm looking for a tool (most likely Flash) that I can easily integrate into a web site and lets users add text and custom images to their cards and then create an image and/or PDF from their work.
is there a plugin that does this?

If you write your own business-card creator in flash, you can save the view to PDF files using AlivePDF.

You could have a look at this: http://www.shirtnetwork.com/en
It is less of a plugin and much more of a fully customizable software solution, with an administration backend, PDF export, billing etc. . I worked on the client and I must say it is a very mature and potent software and probably can do about anything you want, when it comes to customizing products. I don't know, whether you like the pricing model, OTOH to my knowledge, they also provide provision-free licences.
I don't know, whether there are reasonbly expensive components available, that do this for you, because you can get a load of money out of this business, so I wouldn't expect anyone to give them away for free.
greetz
back2dos

Reading email content

Hope someone may be able to help. What i am looking to do is create a small winform app in c# to read the content of a email from a pop account, and upload key values to a sql automatically. The email format is always the same for each email, eg,
First name :
Last name :
Phone number :
etc...
Currently the emails are being stored in a pop 3 account however i want a way to reduce having to key the information into the sql by hand.
Can anyone advise how i would go about doing this or could recommend some guides?
Thanks.
Steve

I would recommend using a class like this POP3 client at CodeProject to read the mail messages.
Once you have the message content, you should be able to fairly easily parse the string, since you know the exact format. There isn't enough information to recommend the best option for this - it depends on whether it's fixed format, delimited, separate lines, etc, but using regular expressions or even String.Split should make this fairly simple.

We use a purchased tool Email2Db tool to process incoming email. It is inexpensive and easy to configure. I wrote custom vb scripts for our needs but a simple insert into a db would not require any coding.

integrating two systems through email

I want to integrate our bug tracker system and our Support system through emails.
The bug tracker can kick out an email on every change to bugs/features. I want to download those emails, parse them and create a formatted email that the Support system can understand (ie the subject could be "Issue #4128 fixed").
What is the simplest way to accomplish this using C++ or C#?

Martin, I'd say there's no "simplest" way to do this. The easy part is downloading the e-mail. (If that's what you need help with, say so and I'll post some C# code that does this.) How you parse the e-mail depends on the format of the message.
For instance, if the body of the message contains the data you want to provide to your support system, your approach will be different than if that data is included as an attachment to the message.
With more information, I'm sure we can be more helpful.