VS 2008 Validation Of XML Against XSD, And ValidationEventHandler
Mar 1, 2012
So the below code validates test.xml against validate.xsd (found the sample code in these forums).
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim myDocument As New XmlDocument
[Code].....
Inside the ValidationEventHandler, how can I get access to that <Date> XMLElement (or whatever element that was invalid)?
I want to access <Date>'s parent node, so I can access <ID> and figure out where this error occurred.
2) Is there a way to pass parameters into ValidationEventHandler from Form1_Load? (Like say I want to pass it an Array to store all the validation errors it finds).
3) Currently exception.linenumber does not work (it returns 0). Is there a way to get the line number the error was found?
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Nov 11, 2009
You have failed to give me "Staring Point".If you don't give me "Staring Point" the program will terminate.I'd like to terminate the entire program based on dialogresult. Do I just kill my main form or is there a line I can put in there to exit program?
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Jan 7, 2011
is there any way of making a textbox only accept intergers and treat them as such when doing calculations.
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Mar 14, 2010
I have text box where scores are to input between 0 and 100, they user also needs the option to enter a text word such as bye or BYE. I having problems getting the validation to work here is what i have so far please let me know what I'm doing wrong.
[Code]...
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Jan 12, 2012
This code works perfectly on my users WEB SERVER - which is in the domain of that system...
Dim domainContext As PrincipalContext _
= New PrincipalContext(ContextType.Domain, "domainname", "DC=domainname; DC=morexxx; DC=moreyyy")
[code].....
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Jan 22, 2011
I have code that will validate whether or not the input is numerical. After that's passed validation, I need to check and see if that value is greater than another.
Here's the code for the numerical validation (it works)
If Decimal.TryParse(EndOdometerTextBox.Text, EndOdometerDecimal) Then
ErrorProvider1.Clear()
Else
ErrorProvider1.SetError(EndOdometerTextBox, _
"Please enter a numeric value.")
EndOdometerTextBox.SelectAll()
e.Cancel = True
Now, I need to verify that the input for this is greater than another decimal (BeginOdometerDecimal). How can I do this? Everything I've tried fails completely (ignored) or messes up the fist validation.
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Jun 29, 2009
email validation for textbox in vb 2008
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Feb 8, 2010
How can I ensure that my program function can only run once a time per day? I wonder how did those commercial software that did something like 30 times/days trial. How did they store the value in the sense that altering the system date and time would not prolong the trial. Currently I am thinking of validating the date through internet time since it can't be alter by user. After which, I will store the value online. However, this does not seems to be feasible if its an offline application. I wonder is the any other better way to do it?
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Aug 11, 2009
I have a control which validates the data entered and it is working. I created a Close Button and set the Cause Validation property to False. The validation keeps on running even though the property is set to false. As a matter of fact, it happens to all the controls as if there is a bug in VB.Net.
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Oct 20, 2009
I validate TextBox for numeric and length no more then 7 characters. I'm checking for Not IsNumber and Len. But I want to give a user to save record when TextBox is blank.
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Aug 18, 2011
I have a piece of business-soft to make the lives of our employees easier. It's fairly typical, a tabbed-MDI style main form with a load of buttons that activate each of its sub-modules.
I have security set up on it so that someone in sales can't enter the module for purchasing, etc... I authenticate the user by having them type in their network password and check it against the AD server with this function:
'Remember to Imports System.DirectoryServices for this to work
Private Function ValidateActiveDirectoryLogin(ByVal Domain As String, ByVal Username As String, ByVal Password As String) As Boolean
[Code].....
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Jul 26, 2010
Basically i am trying to make a form which is in essence a switchboard. Just some buttons to launch some executables. Here is my
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
[code].....
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Mar 22, 2012
I have an application has a data entry form, and currently I'm using the form validation and validated events to validate the data - along with an error provider. I've read that this logic should be placed in the Dataset rather than the form. To that end, i've started exploring how to do that.
[Code]...
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Apr 1, 2010
iam currently working on my uni project and i have encountered a problem with valadation section.My system displays a message telling the user to input any fields that they have missed out on, listing the name of the field. However as these IF functions are in order the user must input the data in the order of how it is in the code. for example if the "consweight" is inputed and the calculate button is pressed, it thinks that all valadation above it has occured, when those fields are still empty.
[code]...
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Feb 15, 2009
I'm using a series of nested if/then/else statements to make sure a user enters information into each text box or chooses a radio button. What would i use to say if no text is entered in textbox1, then ... also what would i use to make a sure the user choose one or the other radio button? for example i also have a combo box, i used "If SubjectComboBox.SelectedIndex <> -1" for the if statement.
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Nov 6, 2010
I have a DataGridView where Cell_Validating is being done. I have a Cancel button on my form that allows the user to exit out of the DataGridView changes. The problem is that if a cell was currently flagged as in error, I cannot exit and remove columns from the DataGridView. I get the following error: Operation did not succeed because the program cannot commit or quit a cell value change. Is there a way to cancel the validation once the focus has been removed from the DataGridView? Here is my Cell_Validating
[Code]...
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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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