Hi,



   May I know how we can use ASP+ to check if an email address keyed in by

a user does exits?



   Thank you and best regards.





Andrew

You can write your customerized validation control code

,and in the code just connect to database to check if this person do

exist and return true or false



  Daniel





----Original Message Follows----

From: "ANDREW" <amigo21@p...>

Reply-To: "ASP+" <aspx@p...>

To: "ASP+" <aspx@p...>

Subject: [aspx] How To Check If An Email Address Is Valid

Date: Fri, 2 Feb 2001 17:30:34 -0000



Hi,



    May I know how we can use ASP+ to check if an email address keyed in by

a user does exits?



    Thank you and best regards.





Andrew

there are ways to ensure that it's in a correct format, but asp.net doesn't do

dynamic lookup on the address itself (as far as i know).  there are third party

solutions that do actually do a DNS check on the address, but i can't think of their

names right now.  someone here should know - if not jump over to www.codeguru.com/vb

and search their message board for it.  i've seen a few answers over there for this

exact question.



as for the formatting - here's the validator code i use to check:



	<asp:TextBox id="txtEmail" size="30" runat="server" />

	<asp:RequiredFieldValidator runat="server"

		id="validEmailRequired" ControlToValidate="txtEmail"

		errormessage="Please enter an email address."

		display="Dynamic" />

	<asp:RegularExpressionValidator runat="server"

		id="validEmailRegExp" ControlToValidate="txtEmail"

		ValidationExpression="^[\w-]+@[\w-]+\.(com|net|org|edu|mil)$"

		errormessage="Please enter a valid email address."

		Display="Dynamic" />



courtesy of "A Preview of ASP+" by, none other than, Wrox press.



hope this helps,



john



--- ANDREW <amigo21@p...> wrote:

> Hi,

> 

>    May I know how we can use ASP+ to check if an email address keyed in by

> a user does exits?

> 

>    Thank you and best regards.

> 

> 

> Andrew

> 



John Pirkey 

MCSD 

John@S... 

http://www.stlvbug.org

  Hi:

  some code  i copy as below,in the page,you can customerized the validation 

control do what you what between the <SCRIPT language="" 

runat="server"></SCRIPT>:



  Daniel





<tr>

  <td align="right" colspan="5">Email:</td>

  <td colspan="1">

   <input type="text" id="txtEmail" size="16" runat="server" />

  </td>

  <td>

   <asp:CustomValidator id="validtxtEmail" runat="server"

    controlToValidate="txtEmail"

    onServerValidationFunction="ValidateEmail"

    errorMessage="The Email you have entered is not exist"

    display="dynamic">

    *

   </asp:CustomValidator>

  </td>

</tr>

<script language="VB" runat="server">

Function ValidateEmail(ByVal objSource As Object, ByVal strEmai As String) 

As Boolean



    //set up the connection

    //check the email exist



    If 'something  Then

      ValidateEmail= True   '

    Else

      ValidateEmail= False  '

    End If



End Function



</script>

















----Original Message Follows----

From: John Pirkey <mailjohnny101@y...>

Reply-To: "ASP+" <aspx@p...>

To: "ASP+" <aspx@p...>

Subject: [aspx] Re: How To Check If An Email Address Is Valid

Date: Fri, 2 Feb 2001 11:33:25 -0800 (PST)



there are ways to ensure that it's in a correct format, but asp.net doesn't 

do

dynamic lookup on the address itself (as far as i know).  there are third 

party

solutions that do actually do a DNS check on the address, but i can't think 

of their

names right now.  someone here should know - if not jump over to 

www.codeguru.com/vb

and search their message board for it.  i've seen a few answers over there 

for this

exact question.



as for the formatting - here's the validator code i use to check:



	<asp:TextBox id="txtEmail" size="30" runat="server" />

	<asp:RequiredFieldValidator runat="server"

		id="validEmailRequired" ControlToValidate="txtEmail"

		errormessage="Please enter an email address."

		display="Dynamic" />

	<asp:RegularExpressionValidator runat="server"

		id="validEmailRegExp" ControlToValidate="txtEmail"

		ValidationExpression="^[\w-]+@[\w-]+\.(com|net|org|edu|mil)$"

		errormessage="Please enter a valid email address."

		Display="Dynamic" />



courtesy of "A Preview of ASP+" by, none other than, Wrox press.



hope this helps,



john



--- ANDREW <amigo21@p...> wrote:

 > Hi,

 >

 >    May I know how we can use ASP+ to check if an email address keyed in 

by

 > a user does exits?

 >

 >    Thank you and best regards.

 >

 >

 > Andrew

 >



John Pirkey

MCSD

John@S...

http://www.stlvbug.org