Validation In .Net Migrated Code?
Apr 15, 2010
If Not IsNumeric(Text1.Text) ThenMsgBox("not numeric")Text1.Focus()Me.Focus()End IfWe've migrated our application from VB6.0 to VB.Net.Consider 2 forms say form1 and form2.Form1 is having a Masked Textbox and Form2 is having a listbox.The code which is pasted above is the leave event of MaskedTextbox.The issue here is that the validation message is displayed twice.We've tried the same in the testbox's validating event as well.But still the same result.Please advice on a resolution.Do we have to consider anything which migrating from VB 6.0 for this scenario ? P.S It's migrated application
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May 11, 2012
I migrated applcation form vb6 to vb.net. Tabpro third party controls are used in vb6.Tabpro have multiple tabs while I convert only first tab get all controls rest of all tabs are blanked. Please suggest what is problem Is Tabpro table control not compatablewith vb.net or is there any solution
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Jun 3, 2010
I am migrating VB application in VB.NET. In VB application , there are using Microsoft windows common control 5.0 COMCTL32.OCX. When I add this component in migrated project, it becomes interop_mscommlib.dll. I want to remove any interop dll in my migrated project. So my question is : Is there any .net supported COMCTL32 which i can use and from where I can get that.
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Dec 7, 2010
Is there anybody which can assist me with a code in VB.NET visual studio 2010 for validating Greek TAX Registration number (VAT).
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Nov 24, 2010
I have almost 15 forms in vb.net 2005, and i have to validate all them, i am using this [code]...
and is working properly but on each form there are 10 to 15 textboxes, maskedtextbox etc so if i place this code on every textbox so it will be a thounds lines of code? so please assist me that how do i write this code shortly for all forms's textboxes.
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Feb 17, 2009
I know that this is not the best way of doing this, so I am looking for suggestions for cleaning this up. Currently, it only allows the user to enter Alpha characters, spaces, and press the enter and backspace key in a textbox.
'allow alpha characters, spacebar and backspace key only
If (e.KeyChar < "A" OrElse e.KeyChar > "z") _
AndAlso e.KeyChar <> ControlChars.Back AndAlso Asc(e.KeyChar) <> Keys.Enter AndAlso
[code].....
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Feb 16, 2012
im trying to build a form+attachment that needs to be send to email.Im using a VB background code (attachementemail.aspx.vb)and my front (b-16.aspx) I want the page to check that the user entered a email, name, phonenumber and attachment. what command do I put in the axp.vb and what on the .aspx tried just about anything.
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Mar 21, 2010
I have a function i'm using to validate some textboxes. However, the zip code masked textbox validation is not working. Zip code cannot be missing any of the first five digits (the last four digits are always optional). Here is the code that is not working. [code] Also, I have a menu item which when clicked will pop up a font dialog box. When i select a font, it is supposed to changed the font of every control on the form. However, it is not working. [code]
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Jan 8, 2011
I have a form that I have been getting submissions that have punctuation and special characters that trigger the potentially dangerous Request.Form value error. I have been trying use the httpUtility.htmlencode and Server.htmlencode method to sanitize textboxes and textareas.All my tests do not fire because the built-in request validation of the 4.0 framework prevents the code-behind from executing to perform the sanitization. I have included the ValidateRequest in the page header but no matter what I set it too it still does the same thing.
This is the code I have so far.
Session("RequestID") = Server.HtmlEncode(txtRequestID.Value)
Session("FirstName") = Server.HtmlEncode(txtInstFirstName.Text)
Session("LastName") = Server.HtmlEncode(txtInstLastName.Text)
[code]....
What can I do to make this work? According to all the websites I have visited it should work.
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May 7, 2010
I have a dataset along with code for validation. When I use a datagridview and setting the EditMode to OnEnter I get the red exclamations telling me that I have an error when this is needed. This works all good. when I click the save button on the BindingNavigator, the application saves the record even when this validation is showing. How do I filter up this validation code through a datagridview and stop the program saving the data? If you need the code for more information, I will add this to the forum.
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Dec 18, 2010
using one form information to be transferred to a second form the code becomes invalid after an validation error has arisen from the first form (ie no adult passengers was selected and the error message was displayed) when corrected the information to be transferred become incorrect as the information is transferred without the correction. [code]
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Feb 11, 2012
validation in vb.netemail_id validation,name,mobile number,Telephone number,zip_code,address i want to all code the textbox
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Sep 23, 2010
When trying to validate controls on a windows form I realise the .validated() for each controls fires when the focus is lost. Instead I'd like to validate only when the button is pressed at the bottom, how would I do this?
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Oct 10, 2011
A Form has two textboxes (txtA, txtB) both with the Causesvalidation property set to True. An ErrorProvider EP is added to the form.The Validating event is as follows:
[Code]...
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Mar 7, 2010
I have two problems related to validation of the DGV cell. First; when I clicked a ToolStripButton, CellValidating event isn't fired. And then it causes problems for me. It needed to be validated.
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Jan 12, 2010
I have a form set up where users can enter their booking for a room at my college. I want to validate the user input to avoid SQL injection (my program uses a MS Access database) and also stop numbers and synbols in their name, etc.I can do the validation fine, but there is to be a lot of validation and then methods executed only if all validation tests come back as true. I did have something like this:
If txtName.Text = "" Then
frmBookErr.SetError(txtName, "Name field cannot be left blank.")
fail = 1
Else
[code]....
And then check the fail variable, but it obviously gets overridden later in the form if one of the validation tests come back as true.
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May 4, 2010
Where to add this validation, or if there is a more efficient way of doing it and where to put it?
CODE:
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Jun 21, 2009
I'm a non developer user of VB. I'm using a simple form to input data to a database. have some text boxes bound to data and use a Binding navigator. I want to be able to handle or catch the error when a non unique ID is added. I have tried to include an error handler in several places but the exception is generated anyway. For example I select to add a new record the change the id to a duplicate value and navigate to the previous record and get the error. I want to check or validate the value before it generates the error to avoid the program crashing if someone includes a duplicate id.
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Apr 27, 2011
I;m making an application (who ins't xD), anyways, I'm using some encapsulation objects to transport stuff to the BLL. i was wondering (and might be sound stupid, I know) what you guys think is better practice:Either use Objects for transporting lots of stuff (like a BLL object to transport all its attributes) Or-handle around Strings through the GUI and only create objects when strictly needed.
Another question that just popped my mind: I'm using a Validation class in the BLL in order to validate stuff like "This particular object is already mapped, error" or "This is not well formed", and throw exceptions, instead of boolean values, since I'm at BLL level. Do you guys use a Validation class or perform the validation from the object itself? The old "who's responsible" problem.
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Jun 15, 2012
I have decided to add some validation to my combobox, what I'm trying to achieve is to make sure that the user can ONLY enter fields that are in the combobox but the problem I have now is that if the user clicks on the combobox and doesnt enter anything and tries to leave the combobox the message box appears.
Private Sub Combobox1_Validating(sender As Object, e As System.ComponentModel.CancelEventArgs) Handles Combobox1.Validating
If Combobox1.Items.Contains(Combobox1.Text) = False Then
e.Cancel = True
[Code] .....
As stated before the coding does work, but I was trying to make sure the message box does not appear if the user doesnt enter anything in the combobox.
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Nov 27, 2009
I have a form which imports a CSV into a datagrid. I have validation for new row, which has error provider appear on form. How can I add validation to the datagrid once the CSV has been loaded to flag that a certain cell must be completed for saving. I can do it in my dataset for new rows:-
Partial Class ContactsDataSet
Partial Class ContactsDataTable
Private Sub CheckContactName(ByVal contactsRow As ContactsDataSet.ContactsRow)
If contactsRow.IsNull("Name") OrElse contactsRow.Name = "" Then
contactsRow.SetColumnError(Me.NameColumn, "Must be completed")
[Code] .....
How can I do it for existing rows or imported rows or get error provider to appear on every cell (called Name) that is empty?
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Jun 22, 2010
i`m totally new to vb actually.now using vb express 2008.i`m currently trying to create log in function.basically, i`m already create database (database in vb 2008 itself) for login,which the login table contain 3 columns, Username, Password and Designation.example
[Code]...
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Apr 23, 2009
Newbie question. I'm writing an ASP.Net MVC app in VB.Net and have been using NerdDinner as a sample (which is in C#). I'm stuck on the validation process specifically the code found in ModelsDinner.cs . I have tried converting it to VB.Net using [URL]...tools/convert/csharp-to-vb/ but it chokes on the Yield statement which found in the GetRuleViolations method (see code below). So my question is how would you do the equivalent in VB.Net?
[Code]...
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Apr 13, 2011
I have a problem in the validation of NumericUpDown control in VB.net. I want it to accept only the numbers, but it is accepting punctuations like '.' and apostrophe also, here my code what I did below, but still the problem persists, I used keypress:
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Dec 8, 2011
I had used this code to validate email id in textbox,but it is not working properly?
Dim Expression As New System.Text.RegularExpressions.Regex("^[a-zA-Z][w.-]*[a-zA-Z0-9]@[a-zA-Z0-9][w.-]*[a-zA-Z0-9].[a-zA-Z][a-zA-Z.]*[a-zA-Z]$")
If Expression.IsMatch(Textbox1.Text) Then
MsgBox("The email address is valid.")
Else
[code]....
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Apr 3, 2011
I have a textbox which has some text on it and when the user will click on it,The problem is, as there is already a text on the textbox when the user will click will diappear to type his respective text, the program is saving the text written also. How to prevent that? All I want is to prevent the program saving a blank textbox and the text written on it?
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Feb 21, 2012
PrivateSubtxtMchNoForFile_KeyPress(ByValsender
AsSystem.Object, ByVale
AsSystem.Windows.Forms.KeyPressEventArgs)
HandlestxtMchNoForFile.KeyPress
[Code]...
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Jan 10, 2011
I am trying to validate a textbox by checking the ASCII values on PreviewKeyDown event of the textbox.This method woorked fine with WinForms using vb.NET.The problem comes wen I use it in WPF.Is there a better method of carrying out validation of textbox in WPF forms ??
[Code]...
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Jan 15, 2012
how to validate an emailid
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Jun 15, 2012
I have a newbie question hopefully the more experienced vb heads will be able to help me with, I have a command button which works like the following [code] I was thinking would it be possible to only run 'Code 4 if the messagebox.show has not appeared for Code 1, Code 2 and Code3?
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