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'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?
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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 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) _
[CODE]...
I tried a "Case 1" but apparently that doesn't work for some reason...
Dense 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...
Im 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 RepliesThe 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 RepliesI 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 can i check whether the text box is numeric or not? Because i want to do validation. but i tried many style still cannot work.
View 6 RepliesI currently have a subroutine that generates a file with specific parameters, and it relies on user input in 2 fields. Now I also have a numericupdown control. What I'm looking for is a way that if Numericupdown.Value = 3 then it will generate 6 textboxes and once the parameters are filled out completely it will generate subroutine times(numericupdown.value) and output it to a single file.
View 3 RepliesI want to be able to save all the vaules that the user has put in the two text boxes.[code]...
View 2 RepliesI was a professional software designer using VB6. Now that I've converted to VB2005 years later, use, with pages of unrelated information. With VB6 I could use Left$, Mid$, etc to parse keyboard input into a string. For example in the KeyPress event of a name box I could use
Case "A" To "Z"
CFName$ = Left$(CFNameBox.Text, CFNameBox.SelStart) + Key$ + Mid$(CFNameBox.Text, CFNameBox.SelStart + CFNameBox.SelLength + 1)
When converting a program from VB6 to VB2005 the software changed the line to
CFName = VB.Left(CFNameBox.Text, CFNameBox.SelectionStart) & Key & Mid(CFNameBox.Text, CFNameBox.SelectionStart + CFNameBox.SelectionLength + 1)
When writing another program I used the VB.Left(), etc, but it gives me an error. So, the question is, what is the correct way to capture keyboard input from text boxes and construct strings?
I have a reset button created in my VB form, but don't know how to code it so that it will accomplish what I want. I want it to clear the form's text boxes so that new input can be entered. I could just code an end statement but this closes the form, and I want to keep it open to continue working with it.
View 6 RepliesI'm familiar with Visual C# and the try/catch for that but I cannot seem to figure out how to do the same thing in VB. Basically I can't figure out how to get the try/catch to work with text boxes and input from the user and whatnot.I've tried setting the textbox.text property = "" but that has no use, I've been trying to find something on Google about it but I cannot seem to find a single thing about textbox try/catch statements. Is it possible to do it with text boxes?
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?
For example, I clicked the Add Text box button, so it added 3 text boxes in the form (I used Dynamic text box so it can add multiple text box). When I input data to one of those 3 text boxes and then Save button has been clicked. It should checked whether the dynamic text boxes are empty or not. If there are empty text boxes, then saving data to db should not be continued and display a message telling the user that empty field(s) are invalid.
In the code below, it saves the data even if there are empty text boxes and I think because it is in the for loop, it checks the text boxes one by one and repeatedly displays the message box that I coded.
Here's the complete code:
Imports System.Data
Imports System.Data.SqlClient
Public Class Form3
[Code]....
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 RepliesI'm using VB 2008 express edition.I have to show the growth of savings in a bank account using input from two text boxes that will be deposit amount and interest rate. I have attached a picture of my form.I have declared my variables and now I'm working on my processing.When the compute button is hit, based on the deposit amount and the interest rate, the amount of years it takes to double the money and the amount of years it takes to become a millionaire with that amount will be displayed in the lower text boxes.
Here's some of my math reasoning...
Doubling time formula : 2P = P(1+ i)^n I tried solving for ^n and got: n = logP(1 + i)/log2P
Is this correct? How do I express logarithms in VB?As for the amount of years that it takes to become a millionaire, can I simply take the deposit amount for example $500 dollars and divide 1,000,000 by 500 to get 2000 so it takes 2000 deposits of 500 dollars each to reach 1 million. Is my arithmetic correct?
The 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
[Code]....
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 ","
[Code]...
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
i was just wondering if there was a way that i could compare data stored in a text file such as usernames and passwords with data input into text boxes in visual studio vb2008?
View 6 RepliesCan someone tell me how to validate numeric, alphanumeric, currency, and 4-digit number in textboxes ?
View 2 RepliesIs there a numeric text box, not an up-down box, a SIMPLE numeric box into which the user can place a number, 5 boxes actually, then on command have the five boxes added and the sum displayed?
View 8 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.
can 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
[code].....
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.