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
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]....
is there a way to check if a string contains characters other than numeric? ive used isnumeric quite a bit and its pretty usefull, but cant find a way to check for text in a string. Having searched around theres a few ways of doing it slowly that ive found using an array of letters and a loop / instring, but thats much more hassle than checking for numbers, so strikes me there must be a way.
[Code]...
how to search a string for numeric type characters and return only the numeric characters to an int field? For example: A field contains a string of "Net 30 days" or "Net 10 days" etc. I want to return only the "30" or "10" or whatever # to a int field.
View 17 RepliesI nedd some help in generating a random alph-numeric password for a form that I building. The form should suggest a password that 18 characters long. The user would either agree to this password or enter their own password.[code]When I use this I get a two digit number.
View 5 RepliesGood Evening! I am attempting to write a code so that someone can enter characters into a text box and then press a button which will validate the string and then count the number of uppercase letters in the displayed text. I also have a button that will allow lowercase tabulation. However I cannot get either to work or display in the associated text boxes.
View 32 RepliesI have encrypted a string to something like this:
1. Asak2$)kla1015QAXKFskfa332aSJ2(Ska@Skljcmcel3p.lq,aowpqaskla2@)Skx.:Pdm^),dfs;
what i want to is convert this string to something like this
2. JXK2LB AP2WXB S1P0XE ZXPA3H X1LAKW DOXPS3
both 1 & 2 the above strings are fictitious (i made them up to make my point clear)
I am trying to make a licensing system for my VB 2010 express application. (2) above will act as a serial key which can be derived from (1) which is an encrypted form of something unique of the client computer.
I will then confirm the (2) from the client.
I validate TextBox for numeric and length no more then 7 characters. I'm checking for Not IsNumber and Len. But I want to give a user to save record when TextBox is blank.
View 12 RepliesI 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 Repliesit 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 Repliesthis 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]...
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 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]....
For years I never had trouble with this String. Format function until today when I got a value longer than 0 characters and the function returned all the characters in the string instead of just ten. Now sometimes I get less than ten characters so I can't use the substring with out getting an error. I can try the left function but I was hoping there was a solution with the Format function.
View 6 RepliesI know how to declare a variable, a function, to write a string of characters or numbers (I still looking in tutorials and depict from there what i need to know) but...WHAT I DONT KNOW is how to USE them? At "what" or "how" are you thinking when you make a program? I try for SOME LOooNG TIME to understand but I think im too stupid to understand from pages on the net (or i dont find THAT tutorial who can explain right for me).I try a lot of programing languages starting with pascal,c,c++,darkbasic,alice, Visual-c,c#,c++,basic,php,even assembler, some programing zones in Excel and Word but from all of this i cant manage to understand the life behind the words.
View 1 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...
I have the following code:
Dim lStatementText As String
Dim lStatementString As New System.Text.StringBuilder
lStatementString.Append(RndRes.Forms.txt_request)
lStatementString.Append(" ")
lStatementString.Append("<b><a>")
[Code]...
Where Request.ID, Request.Description and also RndRes.Forms.txt_* are all strings. I want to display the string I build up here in a Infragistics FormattedLinkLabel. The problem is that if any of the strigs from the Request class contains a HTML character, the label is not displayed properly and the HTML encoding is broken.I need to find a function that masks the HTML codes.
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 need to create a function named isValid to validate some criteria, text length character content. have validated length but i need to validate at least one Uppercase letter and one number is used(minimum) i was thinking of using a loop to check each character individually. thats probablly where i go wrong i, i often convolute the simple and keep heading of track.
View 3 RepliesI want to check if a Vb.net string contains at least 3 non white space characters of which at least one non numeric character. i dont know creating the regular expression for it?
[code]...
Well, it's really my first time to try Visual Basic .NET, then I realized that not all my previous experience with VB6 will work smoothly in VB.NET. I am creating a simple program that will enter a name in the TextBox and will greet them by using the MessageBox class. But I wonder, since the TextBox that I'll be using is for inputting a name, I want to "trap" all numeric keys in my keyboard, I just don't know how to do it. This is fair easy in VB6, using the Text1_KeyPress(KeyAscii As Integer) subroutine.
View 4 Replieshow do i format a variable at runtime.
Here is my code
string cool = // some numeric value e.g. 500000
Label2.Text = " Payment of £ " + cool ;
[code].....
I am using a masked text box to allow users to enter a serial number. The problem is that this serial number has to be communicated over the phone and people seem to be having trouble differentiating between O and 0 and I and 1.
I thought that a good solution to this might be some way of highlighting which characters in the textbox were numeric characters (as opposed to alphabetic characters). Obviously there is no way to do this without using a richtextbox and then I lose the masking ability. Highlight numeric characters in a maskedtextbox?
How do i validate a field which contain both characters and numbers? For example, I have a field call Item ID and it must be in the form of ABC123 where ABC is the fix characters that will appear in all the Item ID and 123 is the one that will change accordingly.
View 2 Repliesi am trying to validate a string that has been inputted into a text box so that it checks all of the characters in the text box individually. I have got the code to check the first character...
If Char.IsLetter(textbox1.Text) = False Then
MsgBox("Error! Invalide charecters present")
Exit Sub
End If If
I was just wondering if there is some sort of loop that i can do so that it checks all of the characters in the text box.
If Char.IsLetter(txtCustomerName.Text) = False Then
MsgBox("Error! Invalide charecters present in customers name")
Exit Sub
End If
I am using this regex string in one of my programs to validate email adresses: "^[a-z0-9._%+-]+@[a-z0-9.-]+.[a-z]{2,4}$". This works well for the most part, but I just found out that it doesn't catch an address like this ... "john.doe.@yahoo.com" ... where there's a "." right before the "@", which is invalid, so my program tries to send it & throws an exception. How to modify my regex string to catch this situation?
View 4 RepliesHow to make a text-box accept only numeric characters (0-9) ? and give an error Message if it contains any alphabets or symbols.
View 4 RepliesThe regex statement below is being used to valid user input for an IP Address.
I want to disallow the ability of a user to type in a domain name (can'tDoThis.com)
How would I change the following statement to NOT allow a user to type in alpha characters.
Dim ipPattern As String = "((2[0-4]d|25[0-5]|[01]?dd?).){3}(2[0-4]d|25[0-5]|[01]?dd?)"
Is there a way to set a textbox in vb such that it does not accept a space or a non-numeric character entered by a user? I am writing a program that has a textbox called "phoneField" in which the user should type in only numbers and if the user trys to type a non-numeric character or space, nothing should be displayed in the textbox. How could that be done?
View 3 Replies