I have a appointments program and the user must be over 18. I was wondering is there a way to restrict the numbers entered into a textbox to be from 18 to 100. can this be done with e.keychar
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I have a appointments program and the user must be over 18. I was wondering is there a way to restrict the numbers entered into a textbox to be from 18 to 100. can this be done with e.keychar
View 4 Replieshow do you restrict letters from being entered into a textbox?I know it invloves textbox_TextChanged but i don't know who to do so.
Edit: I figured out that Letters(25) = (a b c etc...) can be used but how to not enter the letter? Uhm.. Like, the user enters "a" and the program recognizes it using an IF statement. How will it NOT enter the letter into the textbox?
[code]...how to restrict numbers for TextBox?
View 6 Repliesi want to restrict input of a textbox to only numbers but am doing it on asp.net, so i cant check for each character that is being inputed cause it will cost me a post back and thus lots of time?
View 1 Replies[code].....
View 2 RepliesI want my textbox to take only letters as Input, no numbers or other keys.
And Viceversa that I want Only numbers as Input ,no letters or other keys.
I have a textbox where the user enters their name, however it is possible to enter numbers in textbox, i was wondering if there is a pre existing function that only allows alphabetical characters to be entered?
View 17 RepliesI have a textbox which controls the interval of a Timer control. How do I filter out letters? Is it possible to restrict entry to numbers only (like if you enter a letter or a space, nothing happens)? Is there a property of the textbox that can accomplish this?
View 4 RepliesI need to do a check on telephone numbers entered into a textbox.I know the regular expression for an email address but not to check a telephone number like such (000)000-0000
View 1 RepliesI have designed a form with textboxes for numerical entry. I need to validate each textbox so the number entered is an integer, and is between 0-1000. I am struggling to find how to validate the data entry.
View 4 RepliesI have a program that allows a user to input numbers from an inputbox and it displays the Total numbers entered, the sum of the numbers entered, and the average of the numbers entered. What I can not seem to find it how to have it display the largest number entered. The code I have so far is,
[Code]...
Hi, I'm working on a program that reads text entered into a textbox and creates a list of items by separating entries by commas. Everything is working fine, except, because I am using an array to store the items in the list, I have a limited number of entries. This is only a problem because, as it is written currently, each comma counts as an individual entry. Therefore, users can enter ",,," for example, and it would use up 3 places in the array.
I'm looking for a way to check to make sure there is text after the comma before adding an entry. I've attempted to use the .substring command to check the character after, which works until it gets to the last character. Because there is no character after that, it will give an error.
Here is my code for extra clarity:
Public Class frmMain
Dim intCounter As Integer 'Stores the # of commas in the string
Dim Messages(49) As MessageProperties
[code]...
I have some textboxes that I only want numbers in and only want a range of numbers to be valid. Also I do not want to use NUDs. I already have the textboxes connected to functons and subs so I do not really want to change them.How would I do this?
View 8 RepliesI Have Textbox where whatever is entered is to be used for a file name so I do not want certain keys to be entered, i.e. <>|\ /*: ? "
The code I have so far is
Private Sub TextBox1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox1.KeyPress
[code].....
Im trying to do a lab that will obtain 10 numbers from the user using an InputBox() function, store them internally in a one-dimensional array, and then compute the average of the numbers and sort them in reverse numerical order. The program should control that 10 numbers (no more, no less) are entered, and that the numbers are fully validated as integers.
If the user enters non-numeric data, then an appropriate error message should be shown, and that number should be allowed to be re-entered as a valid number. Then all the numbers should be shown as a list in a 'message box'. So far I can get everything but the message box to show the list of numbers entered.
[Code]...
Private Sub Recipient_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles Recipient.KeyPress
If Char.IsLetter(e.KeyChar) Then[code].....
I want that it is not possible to type anything in a textbox, but i do need to place something in it. This is my temporary
Private Sub textbox1_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles textbox1.TextChanged
If textbox1.Text = Nothing Then
Else
textbox1.Text = Nothing
End If
End Sub
But in this way I cant place anything either. I want only that it is not possible to type something in it.
I am just wondering is there any way I could restrict entering spaces into a textbox, or how to check are there any spaces in the text? I do know how to remove them, so I would need to check or restrict
View 8 Repliesi want to know the code for an average of numbers from 1 to a number entered?
View 31 RepliesHow to create a new textbox every time previous textbox.text is entered?
View 7 RepliesI 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:
Private Function ValidateLuhn(ByVal value As String) As Boolean
Dim CheckSum As Integer = 0
Dim DoubleFlag As Boolean = (value.Length Mod 2 = 0)
[CODE]...
OK, every time the letter a is entered into a textbox, I want it to enter in as a 1 instead. Help?
View 3 Repliesi have one more issues, and hope is the last for now. How can I limit a textboxe's input to only numerical with certain range of values (eg -10 to 10) and with that happening while I type in the values?
View 9 RepliesI just D/L VB express 8, and I'm trying to learn how to use it. what I'm trying to do is write some code that:takes a number into a text box (textbox1.text)do some simple calculations with that number when I press a button (button1)display the results in a second text box 9textbox2.textThe first problem I am having:The numbers are in the "milli" range, meaning to the power of negative three, so 10^-3 = 0.01 I do not want to enter 10^-3 or any other exponent into the textbox, I am simply entering in 10 because all my units will be in milli. I've tried using exponent and scientific notation but it doesn't calculate correctly. I've done a "work around" to get it to do what I want, but there has to be a simpler way to achieve the above results without. for example, the user enters 10 into the textbox, the button multiplies 10^-3 *30, as a crude example, and stroes that value (say, B=10^-3*30) and B is DIM B as Double.
Problem number two:Error checking. I need to validate that only numbers can be entered into the textbox, or else the program will display an error message (messagebox). I can achieve this to some degree with sample code from here and other places, but, some of the code does not take into account that some numbers have decimal places (I have foud code that does, and it does work), but if a users enters, say the letter "E", it crashes the program. If the user enters "10.3Z", it crashes the program. I cannot seem to code for the last case, a mixture of numbers and letters to get an error message box.
I made my first app today. The point is to enter a password and then get into a screen that displays info, and you can edit it by typing in the text box. Is it possible to save the data typed?
View 2 RepliesIs it possible to validate the value entered within a textbox by comparing it with a text file that is full off accepted values?
in my textbox will be a location like London, i want to be able to validate that it is correct by looking in my text file to see if it is there?
my textfile would be written like this:
|london|manchester|birmingham|leeds|bristol| ... etc so it need to split the values by looknig with the pipe characters ( | )?
I am working on a program in which I allow the user to quickly add strings to a textbox by pressing a key combination, such as ALT+S. Inserting the strings and setting the cursor to the right position works fine. Its just that windows makes an annoying beep as if an error was encountered every time I press the key combination. I am using the KeyDown event to handle the keystrokes, and I have tried e.Handled = True - without success. Here's a bit of code to give you the idea:[code]
View 2 RepliesI'm using VB 2010 and need to multiply 2 user input numbers in forms, so basically: TextBox5 = TextBox2 * TextBox3 That obviously didn't work but it shows what I want it to do.
View 3 RepliesI am building a form and i want to prevent certain characters from being typed in a textbox? I want to disable the " and ' characters in some of my textboxes
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