Use Text Box Validation?
Feb 21, 2012PrivateSubtxtMchNoForFile_KeyPress(ByValsender
AsSystem.Object, ByVale
AsSystem.Windows.Forms.KeyPressEventArgs)
HandlestxtMchNoForFile.KeyPress
[Code]...
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.net - Adapt Text Validation Function To Consider Selected Text?
Jun 4, 2010I have this function which evaluates the contents of a textbox (or combobox or maskedtextbox) control and, in conjunction with a KeyPress event, will either allow or disallow the input. It is quite useful for dates or textboxes for which only numeric input is valid. It allows a set number of digits after a single decimal point, if specified in the function call. It also allows the backspace character if the textbox is full.
I would like it to allow me to input what would otherwise be valid text when the textbox is full but one or more characters are highlighted (and would therefore be replaced by the keypress character.
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Text Box Validation - Text Boxes In A Form
Nov 12, 2010I am using many text boxes in a form. How do i validate them, In certain text boxes I have to use only text and in some I have to use only numbers. Is using ASCII is a right method or is there any easier method to do this. If so please let me know the coding.
View 5 RepliesValidation Of Decimal In Text Box?
Nov 2, 2010I am trying to validate wether a number is a decimal in Visual Basic. The results I get when the number is valid the msgBox shows. When it is not valid, I don't receive the msgBox and the program crashes with an error message that number has to be less than infinity.I tried adding another If Not IsNumeric(txt1.text) then -- But received the same results.
Where did i go wrong?
If IsNumeric(txt1.text) Then
msgBox("good")
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Text Validation In Text Boxes?
May 19, 2008I am starting out in Visual Basic.Net and need a bit of assistance.I am creating a Windows form (not controls).In this program, I am attempting to validate 2 different text boxes BEFORE the rest of the controls can be validated. For example:I have an authorTextBox and titleTextBox, which the authorTextBox MUST have some user input BEFORE the user is permitted to move onto the titleTextBox. (the user input can be fake like "John Doe", the point is to force the user to input something).The instructions that I was given is not very clear on how to code this properly in order to have the form show an error message requiring the user to input something in both textboxes before they are permitted to move onto the other controls.
View 4 RepliesVS 2008 Text Box Input Validation?
Mar 14, 2010I 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.
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VS 2005 Validation - Text Box To Filled By An Alphabet First Then The Remaining Characters Can Be Anything
Jun 7, 2012I want my text box to filled by an alphabet first then the remaing characters can be anything. Also i have drop down which is having arithmatic functions.(< ,> , = ,+ etc) If the user selects < or > then the value entered in the text box should be numeric. and if the user selects "=" then the textbox value should be string.
View 1 RepliesVS 2005 Text Validation - Check If The Number Entered Is Valid Or Invalid
Nov 18, 2009I am trying to mkae sure that there has been 16 numeric digits entered into the masked textbox. If not show errror message and if so to call the fucnction ValidateLuhn. When calling Validate Luhn i want the program to tell me if the number entered is valid or invalid using the code in the function:
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Form Validation - User Does Not Input Valid Text, EXIT Button Also Does Not Works?
Apr 15, 2012I am doing form validation in VB, I validate the text field data by using txtName_LostFocus function, and on wrong input I used txtName.Focus(). It works well for me. But problem is that as for as, user does not input valid text, my EXIT button also does not works.
View 1 RepliesText Validation : Make Sure User Has Entered A Number(int/float/double Etc.) Not A String?
Apr 5, 2009When I read a value from text box I want to make sure user has entered a number(int/float/double etc.) not a string. Is there any function to check it? otherwise how do i validate it.
Language : VB.NET
Version : Visual Studio 2005
Construct A Login Form With Text Box Control To Perform UserID Validation And Self Service Password Recovery
Feb 14, 2011Design a form, which contain a TEXTBOX control that accept a UserID input, with a CommandButton control to perform a validation based on the criteria listed below. Display a Message on whether the UserID is Valid.
Criteria:
The UserID must contains SIX digits follow by a single character, limit the entry to a maximum of seven characters only.
The postfix character of the UserID is derived from the summation of all the six digits divided by seven and using the remain as followed:
Remain
Character
0
A
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Datagrid New Row Cell Validation - Validate Empty Text And Indicate Error On Cell?
Jun 1, 2010The problem is that if you never enter anything into a cell for a new row then that cell is never validated. This is a problem because I have columns that should not be null. I am doing the check in the row level validation and storing the information about which cells are empty that should not be empty. The row level validation works fine and the row level validation error indicator goes on,(red exclamation mark at the beginning of the row) but I also need a visual indicator on the individual cells that are in error.
I am thinking that setting the HasError property for the cells that are in error should cause them to display n error style (the default red border). Is there a way to this this either from XAML (perferably) or from code?Alternatively I could cause those cells to re-validate when the row editing is finished. Does anyone know how to do this?
Doing All Validation At Once?
Sep 23, 2010When 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?
View 3 RepliesTab Key And Validation
Oct 10, 2011A 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:
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DataGridViewCell Validation?
Mar 7, 2010I 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.
View 18 RepliesDoing A Lot Of Input Validation In .NET?
Jan 12, 2010I 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.
Efficient Way To Add Validation ?
May 4, 2010Where to add this validation, or if there is a more efficient way of doing it and where to put it?
CODE:
Getting Unique Key Validation?
Jun 21, 2009I'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.
View 5 RepliesGUI Communication And Validation?
Apr 27, 2011I;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.
How To Add Validation To ComboBox
Jun 15, 2012I 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.
How To Add Validation To DataGrid
Nov 27, 2009I 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?
Log In Validation To Database?
Jun 22, 2010i`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
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Mvc - NerdDinner Validation Using .Net?
Apr 23, 2009Newbie 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?
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NumericUpDown Validation In .net?
Apr 13, 2011I 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:
View 4 RepliesTextbox Validation In .net?
Dec 8, 2011I 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
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Textbox Validation In VB?
Apr 3, 2011I 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?
View 4 RepliesValidation In WPF(.NET) Using ASCII?
Jan 10, 2011I 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 ??
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Validation Of An Email Id
Jan 15, 2012how to validate an emailid
View 1 RepliesValidation On My Coding
Jun 15, 2012I 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?
View 1 Replies.net WebService - Bypass Ssl Validation
Apr 6, 2009Well im working agains a webservice that has a certificate that is not 100% correctly setup the certificate is setup for the domain [URL] and the api is located at [URL] now i cant connect to this webservice as i then get a WebException "Could Not establish trush relationship for the SSL/TLS secure channel. The remote certificate is invalid according to the validation procedure. Now my question is there any way to bypass this check i use a normal Web Reference (2.0) not a Service Reference..
View 5 Replies