Validate Input In A Textbox?
May 4, 2012
how one would go about validating input into a textbox for example:
Lets say the first letter the user enters has to be 'A' and the third letter the user enters has to be any number ranging from 0-9 and the length of their input cannot exceed lets say 10.
This is what I have so far:
If txtOperatorID.TextLength > 10 Then
bErrorOccured = True
sErrorMessage = sErrorMessage & "-No more than 10 chars" & vbCrLf
[Code]....
The coding for the length works(is there a better way to do this)? The coding for the first letter to be A works but then I have no idea how to set validation for any proceeding characters entered. Am i right in thinking I have to find their position somehow in the string if so how?
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Apr 1, 2011
i have this code:
If TextBox1.Text = "" Then
Label2.Text = " feild empty "
Elseif TextBox1.Text <> "1234" or "7463" or "3625" or "7642" Then
[Code].....
it works when its only only content "1234" but i need to place more than one possible valid input.
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Apr 12, 2010
What is the best way to validate a users input? I need to validate a "Name" entered in a textbox, as well as an enetered "Score".
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Jul 3, 2011
I am going to make a form which will have 10 MaskedTextBoxes. I want to validate input of all these MaskedTextBoxes then Sum the input of validated one into another MaskedTextBox. If there is any value in any MaskedTextBox it mast be validate by the format of "9990.000" or if it is empty return zero. I do not want to write the same code for every MaskedTextBox, I want to use function & sub. The problem with "e" type TypeValidationEventArgs. When I call the SumBurBoxes sub in txtBur_1_TypeValidationCompleted & give the "e" as second parameter, then if the txtBur_1 be invalid type and any other txtBur Boxes have value it will get error on all boxes if the txtBur_1 be valid type even the the other boxes be invalid type it does not get error on them.
Here is my Code.
Public Class Entrance
Private Function RetrnTxtBur(ByVal index As Integer)
Dim txt(0 To 9) As MaskedTextBox
txt(0) = Me.txtBur_1
[code]....
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Apr 4, 2010
Should I validate input parameters on all functions I create? Input isn't passed from a user, but from other routines as part of an automatic process.
I use error handling. I'm not sure what more validating input could do for me. If the input isn't valid, that's pretty much the same thing as an error, isn't it?
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May 5, 2009
I am creating a program and I need to validate my text boxes. For the program the user needs to put in a phrase. But I am not sure how to make sure that the user actually entered in a phrase, the phrase isn't (ex.) skldkfdl, or that there isn't a space.
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Jul 7, 2009
i use visual basic 6 i already try making a button to play sounds. by clicking the button and the sound will out. so that i want to know were could i start, when you input words in textbox the program will speak what you have type in the textbox.
_
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Aug 2, 2010
Im builtina an windows application based on 3 tiers model. I have BLL, DAL, and UI Class. IN DAL I have SQL code, In BLL I have proprietie and methods .Im trying to validate the input fields on BLL class and no problem,and im just do it after SET instruction. I also PUT a message to view error. But From BLL class I want to put the focus in textfield that return error. I cant acess form proprieties (the forms are on UI class).
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Apr 15, 2012
I am trying to create a new class to validate user input and then call that class from my main form. I am not looking for anything to do the work for me, as this is the last part of my project but I am looking for a place to start. I tried the isNumeric IF statement but I have to create an object to reference the specific text box. Can I be generic and say that aTextBox requires validation and then call that class?
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Jan 14, 2012
I'm trying to validate input boxes for numeric value and range value. If I validate for either numeric value OR range value there is no error (for example, comment out one of the validation statements), but if both statements are present and I enter "a" I get an error "Conversion from string "a" to type 'Double' is not valid." Can anyone tell me what I'm doing wrong?
[Code]...
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Feb 25, 2009
how to validate 4 textboxes so that only numbers 1 to 4 can be entered but no number can be repeated.i already have code but it only validates some of the boxes and allows numbers to be repeated in other
Public Class frmGrid
Private Grid() As Short
Private Const intDimension As Short = 3
[Code]....
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Apr 29, 2010
i am use vb 2003 windows app with access 2003 database i want this code to check for numeric input only in the last text box CompanyProdPriceTxBx.Text
this is my
Private Sub SaveCompanyProdbtn_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles SaveCompanyProdbtn.Click
Dim rep As Integer
If CompanyProdNameTxBx.Text = "" Then
rep = MsgBox("Please Input Product Name", MsgBoxStyle.Critical)
[code]....
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Mar 26, 2011
How do I validate textboxes so that they accept only numerical input (1 2 3 etc and not abc @$ etc)? Is there some kind of property of the textbox that I have to change?
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Jun 19, 2009
I'm working on my first VB.NET 2.0 WinForm app. I'm trying to validate some input and I came across this fancy Error Provider control that seems great. However I have a problem with it. It seems that it only validates a field when it loses focus. I'm used to Web Form programming and using validation controls on it, but I don't see these in WinForms.
[Code]...
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Oct 23, 2010
I am making a windows application that should validate user input before opening up the next form page. I can get the error messages to show, but after correcting the error, they won't disappear and open up the form.
[Code]...
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Mar 20, 2011
I have several text boxes I need to validate. I am not understanding how to validate in Visual Basic 2008. So I deployed standard If Statements to handle bad data. I am having two problems.
Lets say the user entered wrong data, example, numbers; an error message is displayed. The text boxes cannot contain numbers, be left empty or contained characters, like !@#$. The problem is if the user enter text, and then entered a wrong data again the code does not work or display error message. How can I make the conditions so that they throw out error message even if the user had previously entered good data.
Another example: If the user enter good data in text box 1 and bad data in text box 2, the error message does not work.
Finally, how do I filter out characters to allow only text. Is there a way to use this code on multiple text boxes with out writing the entire code for each form control?
Here are the conditional statements.
Private Sub btnDataSubmit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnDataSubmit.Click
If IsNumeric(txtDataEntry.Text) Then
lblErrorDisplay.Text = "Invalid Name!"
lblErrorDisplay.BackColor = Color.Red
[Code] .....
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Oct 19, 2010
So right now it all looks pretty with ... <button type="submit" runat="server" name="subscribe" id="Button1" class="link-button" onserverclick="saveListing"> Until it is time to validate the data before calling saveListing function codebehind (in VB .Net). How can true/false be return so that when true saveListing will be called, otherwise not?
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Apr 9, 2011
CODE:
I need to take user input, validate to ensure there's no negative numbers and display monthly fee and check fee in a Label.....with a calculate button_Click
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Feb 19, 2012
If my Category and Forum selection is incorrect I am sorry and feel free to move it. I'd like to have the users input in the message box that will show. For example: There is a textbox and the user puts in their name as Bob. Then the message box would be: What my main goal is, is being able to include the users input they type inside the textbox inside the message box.
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Sep 25, 2010
I have a problem with the code, I have input the valid username and password in the form textbox to input the strings in php, but it keep displaying the messagebox that says login failed.
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
MessageBox.Show("Please enter your username")
ElseIf Textbox2.Text = Nothing Then
MessageBox.Show("Please enter your password")
Else
[CODE]...
I don't really know why it keep displaying the messagebox that says it failed when I have input the valid strings in the first place.
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Sep 28, 2011
My objective is to, instead of entering in the data manually into the text boxes, I want to read in a textfile. The Calculate button will contain the code to read in the file and assign it to the appropriate textboxes. Save the separate file in the \bin\Debug folder.
The text file just needs to have 3 integers on 3 separate lines.The code I posted works without and errors, but.I am having some trouble integrating the Stream Reader.
[Code]...
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Apr 12, 2012
Ok.. i'm trying to validate a textbox, and i think i got the code pinned down, however,after it is validated.. how do i loop so it lets you input the data in again after you have entered incorrect data
Do
NameNew = txtName.Text
If txtName.Text > 100 Then MsgBox("too high")
[code].....
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May 1, 2009
how i validate the textbox textbox only get integer value and after that this integer value assign to a integer variable.
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Mar 24, 2010
I want to write 123.32 i have implement validation but it does not include "."
how to include it
If (e.Key > Key.D0 And e.Key < Key.D9) Or _
(e.Key > Key.NumPad0 And e.Key < Key.NumPad9) _
Or e.Key = Key.Back Or e.Key = Key.Tab _
Or e.Key = Key.Decimal
[Code]...
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Jan 15, 2012
how to validate the text box value? I have one class with function for validating the duplicate value of sql table.
[Code]...
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Apr 10, 2010
How could i validate a textbox in vb.net, so that it gives error message if i enter anything apart from alphabets?
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Mar 5, 2009
I have a form with a textbox, and i would like validation to occur so that a blank field is not allowed
e.Cancel = String.IsNullOrEmpty(TextBox.Text)
Does not always work, because it still allows me overwrite an existing field with blank spaces, and then update.
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Jul 6, 2009
I am trying to validate the character within a textbox. The textbox has a MaxLenght of 1
Private Sub textbox1_TextChanged() Handles textbox1.TextChanged
If allowed_characters.Contains(textbox1.Text) = True Then
textbox2.Focus()
End If
If allowed_characters.Contains(textbox1.Text) = False Then
textbox_userid_input01.Clear()
End If
End Sub
When I enter something in textbox1 at the debug it will do the if contain = false
but the if contain = true doesn't work. I tried a lot, but it still doesn't recognize true.
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Aug 31, 2011
How to not accpet string in textbox only numbers will be validate..for the textbox contact no. and ge..
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Jun 12, 2011
Since my last thread hasn't been answered and I simply cannot wait until it gets answered, how can I validade what is being written on a textbox?
I need to know when the user types a "-" (minus) char. And when he do so, an message appears (preferably an ballon or a tooltip) and says that is illegal to type this char in particular.
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