Validate email

[AishaKhalfan]

Hi all,

I have to send an email in VB.Net 2005 and successfully it works. But now I have a problem I want to validate the txtformbox that the users should enter a validate email. For example they should put @ symbol.


So any volunteer to help me???


I am looking forward to answering my email.


Here you are the code:


Private Sub btnSend_Click(B yVal sender As System.Object, ByVal e As System.EventArg s) Handles btnSend.Click

'Create mail object'
Dim mail As New MailMessage()

'Set Adresses'
mail.From = New MailAddress(txt From.Text)
mail.To.Add(txt To.Text)

'Set the content
mail.Subject = txtSubject.Text
mail.Body = txtContent.Text

'Create Smtp object'
Dim smtp As New SmtpClient("loc alhost")

'Send email'
smtp.Send(mail)
'Show message that the email has been sent to the person'
MsgBox("Success fully message has been sent.", MsgBoxStyle.Inf ormation, "Confirmati on Message")
End Sub



Regards,

Aisha

[kenobewan]

I suggest validating the email using client side script. HTH.

[AishaKhalfan]

I suggest validating the email using client side script. HTH.

Could you explain further about it, because I didn’t get it.


Regards,
Aisha

[dscreation]

check out this link

http://www.asp.net/learn/videos/default.aspx?tabid=63

go down to....

“How Do I?” with ASP.NET

then watch the video tutorial...
Create a Contact Us Page.

he goes over an email validation control that might come in handy.

[Frinavale]

Could you explain further about it, because I didn’t get it.


Regards,
Aisha

Hi Aisha,

Kenobewan's suggestion of a client side validation is probably the easiest.

• Go to your tool box, under the validation section and drag a "RegularExpresi onValidator" onto the page.
• Rename this validator.
• Set its "ValidationExpr ession" property to "email" (click the little dots to select a prebuilt expression)
• Set its "ControlToValid ate" to the text box that's meant for the email.

This will register a JavaScript during run time that will check the textbox to make sure that its a valid email before any submitting will be allowed.

Cheers!

-Frinny

[AishaKhalfan]

Hi Aisha,

Kenobewan's suggestion of a client side validation is probably the easiest.

• Go to your tool box, under the validation section and drag a "RegularExpresi onValidator" onto the page.
• Rename this validator.
• Set its "ValidationExpr ession" property to "email" (click the little dots to select a prebuilt expression)
• Set its "ControlToValid ate" to the text box that's meant for the email.

This will register a JavaScript during run time that will check the textbox to make sure that its a valid email before any submitting will be allowed.

Cheers!

-Frinny

Hi,


This is a great idea for ASP.NET but my application is Windows based, so that one won’t work.


Thanks a lot


Regards,
Aisha

[vanc]

An quick idea about this issue is split information in address and check it.

For a single email address like "abc@aaa.com.au "

1. you split this string by "@" and check for its length--->the length must be two
2. if the length is two, check for the first part is "abc" for any incompatible characters by using Contains method, you have to get an array of all incompatible characers, they are not many actually.
3. repeat the step 2 with the second part of the address and split the other part of email, here is "aaa.com.au ", split it with "." and check for length, the length should between 2 to 3

Cheers.

[AishaKhalfan]

An quick idea about this issue is split information in address and check it.

For a single email address like "abc@aaa.com.au "

1. you split this string by "@" and check for its length--->the length must be two
2. if the length is two, check for the first part is "abc" for any incompatible characters by using Contains method, you have to get an array of all incompatible characers, they are not many actually.
3. repeat the step 2 with the second part of the address and split the other part of email, here is "aaa.com.au ", split it with "." and check for length, the length should between 2 to 3

Cheers.

HI Cheers,

This is what I done, Please advice me if there is any error.

However, I don't know how to do the second step, help me please.


'Create mail object'
Dim mail As New MailMessage()

'Set Adresses'
'make sure to include symbol @ in textbox From & text box To
If txtFrom.Text.Co ntains("@") And txtTo.Text.Cont ains("@") And txtFrom.Text.Le ngth > 2 And txtTo.Text.Leng th > 2 Then
mail.From = New MailAddress(txt From.Text)
mail.To.Add(txt To.Text)

'Set the content
mail.Subject = txtSubject.Text
mail.Body = txtContent.Text

'Create Smtp object'
Dim smtp As New SmtpClient("loc alhost")

'Send email'
smtp.Send(mail)
'Show message that the email has been sent to the person'
MsgBox("Success fully message has been sent.", MsgBoxStyle.Inf ormation, "Confirmati on Message")
Else
MsgBox("Please Enter valid email")
End If


Regards,

Aisha

[vanc]

1. Spit the address string
eg: "abc@aaa.com.au "
eAddress = txtFrom.Text;
string[] address = eAddress.Split( '@');
if(address.Leng th != 2) return false;
if(address.Leng th == 2)
{
foreach(char aChar in compatibleChars ) //compatibleChars is an array that contains all compatible character for email address like '.' '-' '_' etc...
{

}
}

[vanc]

Sorry I hit Submit button....:D

1. Spit the address string
eg: "abc@aaa.com.au "
eAddress = txtFrom.Text;
string[] address = eAddress.Split( '@');
if(address.Leng th != 2) return false;
if(address.Leng th == 2)
{
foreach(char aChar in compatibleChars ) //compatibleChars is an array that contains all compatible character for email address like '.' '-' '_' etc...
{
if(!address[0].Contains(aChar )) return false;
if(!address[1].Contains(aChar )) return false;
}
//at this far both side of the address is ok but it needs to be checked for valid //domain. So just split it again with '.'

string[] domain = address[1].Split('.');
if(domain.Lengt h < 2) return false;
if(domain.Lengt h > 3) return false;
//domain of address should be something like .com or .com.au if you know any
//different type of domain, just add it in.
}

hope this help

cheers.

[AishaKhalfan]

Sorry I hit Submit button....:D

1. Spit the address string
eg: "abc@aaa.com.au "
eAddress = txtFrom.Text;
string[] address = eAddress.Split( '@');
if(address.Leng th != 2) return false;
if(address.Leng th == 2)
{
foreach(char aChar in compatibleChars ) //compatibleChars is an array that contains all compatible character for email address like '.' '-' '_' etc...
{
if(!address[0].Contains(aChar )) return false;
if(!address[1].Contains(aChar )) return false;
}
//at this far both side of the address is ok but it needs to be checked for valid //domain. So just split it again with '.'

string[] domain = address[1].Split('.');
if(domain.Lengt h < 2) return false;
if(domain.Lengt h > 3) return false;
//domain of address should be something like .com or .com.au if you know any
//different type of domain, just add it in.
}

hope this help

cheers.

Thanks a lot cheers for supporting. Good bless you


Regards,

Aisha