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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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.
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.
View 3 RepliesI 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]....
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.
View 2 RepliesI 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?
View 2 RepliesI 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?
View 1 RepliesI 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?
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].....
[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.
View 3 RepliesI 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?
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?
View 3 RepliesI 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?
View 1 RepliesAll 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]
View 4 Replieshow 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?
View 2 RepliesI'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]...
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.
View 6 RepliesI am working on a project that my manager wantes me to log the chages that are being made to a peticular database. The database is 4 columns of data with about 60 rows of data within. If i make a change to a piece of information in COL X of Row Y how would i record the information in COL 2 of Row Y?
View 2 RepliesI frequently use TextBoxes that expect date values. I do a tedious job every time to handle the Validating event. The Validation event ensures that the value is a valid date value according to the current thread's Calendar, and if so, formats the date to "dd-MM-yyyy".
I want a TextBox (e.g. DateTextBox) that automatically runs validation and formats its Text property. All I have to do is dropping it to the form.
I know I should use inheritance; but I do not know where to put the auto-validation code; and I do not know how to save the inherited class as a control in the ToolBox.
I have a custom text box component (inherits from system.windows.forms.textbox) that I created in vb.net (2005) that handles the input of numeric data. It works well.
I would like to suppress the validating and validated events from firing if the number hasn't changed. If a user is tabbing through the form and tabs from the text box, the validating/validated events are fired.
I was thinking that the text box could cache the value and compare it to what is listed in the text property. If they are different, then I would want the validating/validate events to fire. If they are the same, nothing is fired.
I can't seem to figure out how to suppress the event. I have tried overriding the OnValidating event. That didn't work.
Update:
Here is the custom text box class. The idea is that I want to cache the value of the text box on the validate event. Once the value is cached, the next time the user tabs through the box, the validating event will check to see if the _Cache is different from the .Text. If so that is when I would like to raise the validating event to the parent form (as well as the validated event). If the _cache is the same, then I don't want to raise the event to the form. Essentially the text box will work the same as a regular text box except that the validating and validated method are only raised to the form when the text has changed.
Public Class CustomTextBox
#Region "Class Level Variables"
Private _FirstClickCompleted As Boolean = False 'used to indicate that all of the text should be highlighted when the user box is clicked - only when the control has had focus shifted to it
[Code]....
I want to use windows authentication in my vb.net application rather than validating against Database. Is there any possiblitiies or APIs that allows me to use Windows authentication? I have user id and passoword text boxes. Once user entered the userid and password, it should validate again Windows authentication.
View 1 Replieshow to validate the Duplicate record before Inserting and Updating Command is Trigered from VB.Net Form. I am new to VB.
View 2 RepliesI am writing below code for validating compulsary field account no. in form.User's requirement is set focus back on field when error comes :
If txtAccountNo = "" Then
MessageBox.Show("Account no filed can't be left empty")
txtAccountNo.SetFocus
Exit Sub
End If
It's working properly. But suppose user don't want to fill form and exiting from application.Message box keep on appearing till user enters account no.
[code]....I have a dialog that comes up and asks for a reason for declining the business.I don't want the code to move on after not enabling the "me" until the reason has been entered and saved into the database. Also, at that point where it says "I WANT...." I want to copy the textbox fields into a new database and then delete this entry from the database, how can I do that. I am using VS 2008 and SQL.
View 2 RepliesBasically I have a routine that validates an XML document, here is the code:
[Code]...
If you look at the XSD file you'll see that the element ID is supposed to mandatory in that I have set minoccurs to 1. However when I run the code this doesn't seem to be flagged as an error. Also I get 20 errors like Could not find schema information for the element Employees etc.
I'am using the NumericUpDown_Validating event to cancel mouse clicks on the up and down arrows of the control.The idea is that the NumericUpDown control will stop incrementing when the base of a form reaches the bottom of the screen. That works, however the textvalue keeps incrementing. Why does the text keep incrementing and how do I stop it?
Private Sub NumericUpDown5_Validating(ByVal sender As Object, ByVal e As .ComponentModel.CancelEventArgs) Handles NumericUpDown5.Validating
Dim y As Integer
[code]....
I have a form that has a text box that I want to only allow users to enter a date and then a MessageBox.Show stating that their data was submitted when they press a submit button. I know that you can do this with a regular expression validation but I have no idea how to do this in Visual Basic. Can anyone offer how to do that?
View 2 RepliesI have a VB.Net program that manually sends email via the MS Exchange Server. When an email is sent it will always have at least 1 pdf file attached to it. After all the emails have been sent (which could be alot), the pdf files are moved to an archived directory.My problem that seems to be occurring is that some of the attachments are not being moved because they are "locked" by another process. I'm assuming this "other" process is the Exchange server handling the pdf attachment but I'm not positive about this.How can I check to see if the attachment was successfully depositied into the Exchange server?
View 1 RepliesI have two text boxes on my form (Text Entries) How do I code either the button or the text boxes to ensure entries are made in them Regards
View 3 RepliesI'm throwing errors when I call this function before running my calculations:
Function CalcValidation() As Boolean
' Didn't want to leave something out, so I needed a validation to ensure that a selection
' had been made for each component.
[code]....
