Validating E-mail Address In Textbox?
Apr 5, 2010
I would like to know if there is a simple way to validate an e-mail address? I have seen many ways that appear to use functions but I would like to use something simple because currently my error control is done like this:
If txtEmail.Text = "" Then
ErrorProvider1.SetError(txtEmail, "You must enter your e-mail address.")
Else
ErrorProvider1.SetError(txtEmail, "")
Is there a way to use the same type of syntax but instead of checking if the textbox is empty, check if it a valid e-mail address? I know the regular expressions can be used, but how in this circumstance?
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Jun 18, 2012
I have the following function which works fine to validate the email address - however, if I have an apostrophe before the @ e.g., [url]
It gives the error message "This email address is not valid"
Code below
CODE:
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Oct 9, 2009
Im trying to make a email client, iv got it all working but im looking to validate the email address field to make sure that its actually an email address so it has a @ sign.Also one other thing is, when the client authenticates with gmail id like to catch the error if its not authenticating properly. Is there a way to do this?
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Feb 28, 2011
Maybe I'm missing something simple, but I want to add a clickable 'To:' e-mail address to a form so that you can click it to loads a blank e-mail with the
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Feb 2, 2011
I am developing client application I store client details with e-mail address. but I give permission to users to entry valid e-mail address of every client, In that case I will check valid e-mail address for that how to check the given valid e-mail address
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Jan 6, 2010
I need to get friends list (from address book) from Yahoo Mail. How can I do do this in VB.NET?
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Dec 2, 2009
I am tring to get the receivers' e-mail address from a Ms access (mdb) database but I am failing. I had another thread but it started to get longer and I decided to open another one. Let's make a summary. Below is my VB code;
Imports System.Net.Mail
Imports System.IO
Imports System.Net
[Code].....
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May 31, 2012
i am read the email address from the notepad using.[code]after that i assign the value to email.from.In debug mode, i traced and found the value assign in to mail.from is an valid email.. but ! the error still come out [code]
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Apr 9, 2012
i have a problem in this code
Imports Microsoft.VisualBasic
Imports System.Net.Mail
Public Class SendEmail
[code]....
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Feb 18, 2010
i get the above error when reading in an email from a text file.[code]
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Aug 11, 2011
Currently, to avoid errors from being thrown up due to invalid email addresses, I do the following:
Dim mailAddress As MailAddress
Try
mailAddress = New MailAddress("testing@invalid@email.com")
Catch ex As Exception
'Invalid email
End Try
However, rather than depending on Try..Catch, is there a way of validating that the email address will be 100% valid for the MailAddress type?I know there a plenty of regex functions out there for validating emails, but I'm looking for the function which the MailAddress type uses to validate its addresses.
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Oct 6, 2011
I am trying to create a new MailAddress, the email is coming from Request Parameters, that is: Request.Params("fromEmail"). It is actually being sent from an android device through an http request.When I try to create a new MailAddress from this email, I get the error "The specified string is not in the form required for an e-mail address". When trying to create it directly, that it ma=new MailAddress("a@b.com") using the same coming string, it works, but creating it using ma=new MailAddress(Convert.ToString(Request.Params("fromEmail")) produces the error.
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Nov 19, 2011
I'm writing a part of an application for a movie ticket program.
Basically, I have to write an If statement verifying the age put in a textbox, based on a radiobox that is checked.
So, if the radiobox "PG" is checked, the age in the textbox has to be equal to or greater than 12. If "Restricted" is checked, then the textbox has to be equal to or great than 17.
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Nov 23, 2010
I have a textbox, a standard button and a toolstrip containing a couple of buttons. In the validating event of the textbox i coded to check whether it is blank. If yes then it shows a message 'Enter Value'. When the standard button is clicked while the textbox is empty, it's validating properly and showing the message but when the toolstripbutton is clicked it's not not validating the textbox and no message is being shown. It seems that I gotto write the validation code explicitly in the toolstripbutton_click event which is too troublesome when there are multiple textboxes and toolstripbuttons on a single form. What I want to know is whether the textbox_validating can be fired while the toolstripbutton is clicked? Handling toolstrips is really a headache. I'm badly in need of it.
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Jul 22, 2009
I have a page where a user can either select a vendor via dropdown or enter a vendor number via textbox. One or the other must have a value. I can do this in javascript easily but how can I do this using a custom validator provided by ajax all on the client side?
Edited:
Protected Sub ImageButton1_Click(ByVal sender As Object, ByVal e As System.Web.UI.ImageClickEventArgs) Handles ImageButton1.Click
If Page.IsValid Then
//save stuff
End If
[code]....
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Jul 27, 2010
I have a MDIParent form and 2 child forms. One of them,form1, has a textbox for which certain validations are present in the validating event. The other one has a button on it. When I try to navigate from form1 to form2, the validating event is firing twice for the first time. Is there a way to make it fire only once. And also, this event fires whenever I try to close the mdi parent form Attached is a sample project.
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Nov 23, 2010
I have a textbox, a standard button and a toolstrip containing a couple of buttons.In the validating event of the textbox i coded to check whether it is blank.If yes then it shows a message 'Enter Value'. When the standard button is clicked while the textbox is empty, it's validating properly and showing the message but when the toolstripbutton is clicked it's not not validating the textbox and no message is being shown. It seems that I gotto write the validation code explicitly in the toolstripbutton_click event which is too troublesome when there are multiple textboxes and toolstripbuttons on a single form. What I want to know is whether the textbox_validating can be fired while the toolstripbutton is clicked?
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Nov 23, 2010
I have a textbox, a standard button and a toolstrip containing a couple of buttons. In the validating event of the textbox i coded to check whether it is blank. If yes then it shows a message 'Enter Value'. When the standard button is clicked while the textbox is empty, it's validating properly and showing the message but when the toolstripbutton is clicked it's not not validating the textbox and no message is being shown. It seems that I gotto write the validation code explicitly in the toolstripbutton_click event which is too troublesome when there are multiple textboxes and toolstripbuttons on a single form. What I want to know is whether the textbox_validating can be fired while the toolstripbutton is clicked?
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Feb 8, 2012
I am trying to validate a string that has been inputted into a text box to make sure there is nothing but alphabetical charecters in the textbox. The following code only checks the first character in the textbox...
If Char.IsLetter(textbox1.Text) = False Then
MsgBox("Error! Invalid charecters present")
Exit Sub
End If
I was wondering if there was any way that i could turn this into some sort of loop so that it checks all of the charecters present within the textbox?
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Sep 22, 2011
I'm a beginner using VS2010 Express. Using a windows form, I'd like to be able to validate a textbox against a column of data in an existing SQL table when the user selects a submit button. To my surprise, a google search revealed very little-- a few instructions using C#, but I'd really like to continue learning VB (only background is with VBA).
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Feb 19, 2012
I have a textbox control to take some input and a button to execute something. I want the button's click event will not work as long the validation to the textbox is successful.
Private Sub txtSuffix_validate(ByVal sender As System.Object, ByVal e As System.ComponentModel.CancelEventArgs) Handles txtSuffix.Validating
If Not txtSuffix.Text = "" Then
[Code].....
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Feb 13, 2012
[code] how can I also allow a decimal point, and also it will not let me Exit the program unless there is something in the textbox, I have looked around and have seen a few different codes but they seemed kind of complicated.
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Sep 11, 2009
In WinForms I could handle the Validated event to do something after the user changed text in a TextBox. Unlike TextChanged, Validated didn't fire for every character change; it only fired when the user was done.Is there anything in WPF I can use to get the same result, an event raised only after the user is done changing the text?
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May 24, 2011
I have an ASP.Net 2.0 textbox which I need to be validated as having some content, but where whitespace alone is valid input. A required field validator seems to reject a pure whitespace input as invalid. A regular expression validator won't fire at all on empty content. Is there a simpler way round this than using a custom validator control?
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Apr 17, 2009
All I want to accomplish is require an extry on a textbox, and raise an error.When I run, it forces me to put something in the textbox. Not sure why, because this code never gets executed in the program when I go in debug. This is on my top 10 worst days of work in my life. Trying to learn VB.NET, like 27,000,000 other people out there.[code]
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Jun 8, 2012
how to validate and save the results of a textbox when I change to another tab on a tabcontrol?I have found the SelectedIndexChanged and LostFocus but they do not tell what was the tab that has been previously selected, so I then can do that validation and save. is there an event that triggers before the SelectedIndexChanged?
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Jun 12, 2011
I'm trying to validate the correct format for a phone number in a text box: (000) 000-0000 For a test, i made it so that a messagebox shows up saying "correct" if the format is correct. This test works well WHEN the format is correct. BUT when the format IS NOT correct, I keep getting an error saying that the index was out of the array.
[Code]...
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Apr 2, 2009
I have form with ComboBox and TextBox. ComboBox has values A, B. And I would like to validate TextBox. If user select A so TextBox need to check for numeric and amount of numbers can't exceed 10 characters. If will entered not numeric characters error will indicated. If user select B so TextBox will check for string and user can enter any characters. Only if box is empty error will indicated.
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Jul 9, 2010
when i run my program this come up "The specified string is not in the form required for an e-mail address." this is my code. textbox4 is in email address form.
CODE:
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Apr 8, 2011
I need a feedback form for my site.i need the user to write there.
Mail
Title
Info
And then when they press send then i get a mail to my hidden mail and a confirmation is send to the user mail.I have google the web but cant find any good info about this, i know how to make the form but how do i make the codebehind !?
Do any of u pro. have a link to a great tutorial or have a code that can be used !?
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