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]...
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]....
I have two Numeric "spinner" boxes on my form called, nrcStartNumber and nrcEndNumber. The valid range for these boxes is 1-9999 (set for the controls at design). My question is what is the proper way to validate the two controls against each other such that the nrcEndNumber is always greater than nrcStartNumber? A similar question would be the same thing with two datetimepickers (formatted to time) such that the end time is always after the start time?
View 5 RepliesI am writing a calculator app in VB Express 2008. I'm trying to get the app to accept numeric and operator input while ignoring all the alpha input. In other words taking input from the numeric keypad and the top of the keyboard and ignoring all the letters.
Here's the block of code I have so far:
Private Sub TextBox1_KeyDown(ByVal sender As System.Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles TextBox1.KeyDown
If (e.KeyCode >= Keys.D0 OrElse e.KeyCode >= Keys.NumPad0) And (e.KeyCode <= Keys.D9 OrElse e.KeyCode <= Keys.NumPad9) Then
Select Case e.KeyCode
[code]....
I can't get vb to recognize the above code it seems to skip right over it. BTW, is 'Keys.Crsel' the same as the caret '^' symbol?
it should take either decimal values or integers and max length is 16if it takes decimal value as input then it should contain only 14 digits in decimal place and 2 digits in fraction part eg(1234567.12-valid) but (12345678.123 - invalid) and also(123456.12345- invalid)
View 2 RepliesThe code below allows me to enter an integer in to the text boxes, but if I enter a decimal in any it throws an error. How do I validate decimal values in addition to integers?
Private Function numeric() As Boolean
'validate text boxes as numeric
Dim blnnumeric As Boolean = False
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this is my code in VB.NET 2008 and it works as the result, i can input starts from 1.00 until 99.99
but i need more than this i want the textbox automatic validate the input as i typed in the textbox
example: i typed "1000" then the textbox will write "1,000"
example: i typed "10000.99" then the textbox will write "10,000.99"
nb: it has to disabled from typing ","
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I have the following bit of code to validate two text box entries, and it catches both text boxes individually just fine but my question is: Where would I put the code if the text box entries are both valid?
Dim intExponent, intBase As Integer
Dim ErrNum As Int16 = 1
If Not Integer.TryParse(txtExponentInput.Text, intExponent) _
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I tried a "Case 1" but apparently that doesn't work for some reason...
is there any function to validate if a string has only numerical characters? I can cross character for character and verify if it is a number. But I look for something simpler or if already a function like that exists.
I cannot use IsNumeric or IsDigit because it returns numbers to True with point or comma.
I need only numeric characters (no comma nor points
Can someone tell me how to validate numeric, alphanumeric, currency, and 4-digit number in textboxes ?
View 2 RepliesDense student here with little sleep here during finals week...I have a text field being read on a button click event (along with lots of other information being read). This field needs to have a number entered.
I either:
1) Force a default value (i.e. - "2")
2) Verify there's something in the field AND that something is numeric...
I am trying to get my program to validate the hexadecimal range entered by the user, the range being between 00 - FF,
View 17 RepliesIm trying to code a program, that will only accept numeric values in a text box, and if you try to enter non-numeric values you get a message box that says "Please Enter Numeric Values Only." Is this possible?
View 3 RepliesI have a form with '7 text boxes' and '1 list box' (for country selection). Basically, i want the user to have to input data into all 7 text boxes but the list box has to contain a country from the drop down box (so the user cant just type random text into the list box)If all this ^ data has been met, then the 'button' is enabled.What would be the easiest way to implement this.
View 2 Repliesi am trying to get the salaries of different employees using a dialogue box.As shown in the code below, I grab the salary from the dialogue box and pass it to a method (GetReading) in the Employee class. I would like the method to return true if the current salary entered is greater than the previous salary entered. If false, to display the dialogue box again for a valid salary to be entered.
Dim salaryReading As Integer
uiReadingsDialogue.ShowDialog()
salaryReading = CInt(uiReadingsDialogue.uiSalaryReadingTextBox.Text)
[code]....
But I can't get the dialogue to pop back up in order to enter the valid reading.
The form has First Name, Last Name, Course and Email text box fields. First/Last Name must have no spaces, Course must consist of a three letters and two numbers in that order and nothing else(I want to avoid the use of masked text box), and Email must have the "@" sign and a dot. How would one make it so after clicking, say, Submit button and if there was a violation of any of the above rules then message box should pop up and tell the user which fields contain incorrect information.
Private Sub buttonAddNewStudent_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles buttonAddNewStudent.Click
'validation must be performed before the corresponding text box items will be placed inside an array
[Code]....
I find myself copying single files to multiple different machines, so would like to create something to help.I would like a numericupdown, which dynamically adds text boxes (which will be destination file paths). I will obviously need it to remove them too when I decrease the number.
View 6 Repliescan anyone look at this and see why it doesn't work? When I test and enter a numeric value in the text box it still gives the error I have placed in the code, same if I put in a letter etc.
Private Sub valueDouble(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles txtTestscore1.TextChanged, txtTestscore2.TextChanged, txtTestscore3.TextChanged
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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".
View 8 Repliesi 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.
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?
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]....
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?
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.
View 3 RepliesHow do I suppress all data except numeric?
This is not working on KeyDown():
If e.KeyData < Keys.D0 Or e.KeyData > Keys.D9 Then
e.Handled = True
End If
I am writing a small program here and this i=code is straight out a book and it doesn't seem to work. Its supposed to ensure that the users input is numeric and not contain letters.
Module Module1
Sub Main()
Dim user_Input As Single
Dim H As Single
Do
Console.Write("Enter you'r Height in Meters: ")
user_Input = Console.ReadLine
Loop Until IsNumeric(user_Input)
H = CSng(user_Input)
Console.WriteLine("You are {0} meters tall", H)
End Sub
End Module
i have finished my code and the program works but i need setup a few error messages incase a user inputs invalid data (non numeric, and negative numbers)i keep getting both errors at the same time when i input a negative or non numeric data. My program allows a user to calculate cell phone bill
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I have a function in my textbox1 with the got focus event. I have a 40 textbox in my goupbox1.[code]I want that when the textbox1 gotFocus, all my textbox in groupbox1 under the for loop event will declare that only numbers are allowed to be entered in all the textbox. I manage to work with it but only in a single textbox. Here is my code for it.[code]Is there a way or would it be posibble to put this code # 2 into the code # 1? So that I don't have to declare 40 TEXTBOX which is not good.
View 5 RepliesI'm working on a program that requires the user to input an integer. How do I prevent the user from entering a non-numeric value? I tried using the IsNumeric() function but I get an error before I can use it. I get the error at the console.read, before I can call the IsNumeric() function. [code]...
View 5 RepliesIs it possible that a user input to a textbox like '12500', but vb shows it
'12,500' at the time of input.
But at the saving time vb should to read the '12,500' as '12500'.
