Allowing Only Numbers (not Letters) To Be Entered Into Textbox

Nov 15, 2009

I 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?

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Allowing Only Letters And Space Key In Textbox

Nov 3, 2009

I have a textbox and I need to restrict entry to only the letters A-Z , a-z and the space key. I know I need to use something like
If (Microsoft.VisualBasic.Asc(e.KeyChar) < 65) _
Or (Microsoft.VisualBasic.Asc(e.KeyChar) > 90) etc
with an e.handled at the end

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VS 2008 Restrict Letters From Being Entered Into A Textbox?

Feb 2, 2010

how 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?

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Allow Only Letters And Numbers In TextBox?

Oct 10, 2010

How can I allow only letters A-Z (both lowercase and capital) and numbers 0-9 to be entered into a TextBox control? Also spaces are not allowed either.Goldfish64

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Make Validations For Textbox Allow Numbers Only Or Textbox Allow Letters Only?

Sep 9, 2010

How to make validations for textbox allow numbers only or textbox allow letters only?

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Distribute Numbers And Letters From One Textbox To Many?

Dec 6, 2010

I'm on VS 2008 I have one form contains many textboxes,when I write in one textbox (UserName) the letters and numbers should distribute to the other texts where each textbox has only one letter or number from the original text to get them ready to be encrypted.

What code I can use in text change event that takes the whole text and throw it in the other textboxes so each textbox has only one value ?

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Set The Mask For The Textbox For Only Letters And Numbers?

Apr 26, 2009

I want to set the mask for the textbox for only letters and numbers with no spaces like thisthe "*" represents letters and numbers)

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Limit Textbox To Input ONLY Three Numbers And Letters?

Sep 29, 2009

How can we limit the textbox to input ONLY three numbers and three letters?

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Prevent Numbers Being Entered In A Textbox?

Mar 11, 2012

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?

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Restrict The Numbers Entered Into A Textbox ?

Dec 5, 2010

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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Check On Telephone Numbers Entered Into A Textbox?

Jan 6, 2010

I 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

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Forms :: Restrict Numbers Entered Into Textbox?

Dec 5, 2010

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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User To Input Numbers From An Inputbox And It Displays The Total Numbers Entered?

Mar 18, 2011

I 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]...

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VS 2008 Show The Letters That Have All Ready Been Entered?

Apr 25, 2009

I'm making a hangman game (yes everyones starting point) and got the basics running. I've added so extras to it, such as reading in random words from a text file, only allowing capitals to be entered, an option of guesses the phrase etc. All very simple but a nice way to learn.

Anyway, I want it to show the letters that have all ready been entered between each guess. I want to do this by using an array and making sure the same letter cannot be entered more than once into this array.

So far i have the following:

Sub Main()
Dim GuessLetter As Char
Dim LettersGuessedArray(26)

[Code]....

and i do not know why. I want it to output the letter entered from the array "LettersStoredArray".

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Try-Catch Block Not Allowing Negative Numbers?

Sep 24, 2009

I have a program in which users are entering numbers into text boxes. I'm checking for proper data entry using a TRY-CATCH block. It works great and delivers an error message if the users enter anything non-numeric.

The problem is that now I need the users to enter negative values, but the TRY-CATCH is seeing the negative sign as non-numeric.

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Enter Numbers And Letters?

May 23, 2009

How do i make it so that you can only type in numbers and letters in a textbox? I want to disable the use of ("*(&$.....etc.) those types of symbols.

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Every Combination Of Letters And Numbers

May 19, 2009

I'm looking for some function to put together every possible combination of letters and number to create a string that is 14 characters long. I have found ways to make every possible combination of letters and numbers seperately. However, I've never run across anything to come up with them together. Every string created must contain letters and numbers.I just have no idea where to start on this one.

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How To Convert Numbers To Letters

Aug 17, 2009

i want to know how to convert numbers to lettres.

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Allow Users To Press Numbers Just Letters?

Feb 5, 2012

im validating textboxes in my form so it will not allow users to press numbers just letters.the code i'm using is Private Sub Textbox_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) _ Handles txtFirstName.KeyPress, txtSurname.KeyPress, txtAddress2.KeyPress, txtCity.KeyPress

[Code]...

what i need help with is, ive created a lable called lblFn next to the FirstName Textbox and would like this to be updated with "Please enter Characters Not digits" if a user enters digits in the textbox, how do i amend the above code to get this working?Basically whatever textbox a user enters wrong data in it updates the corressponding label next to it!

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Convert Numbers(0-9) To Corrosponding Letters(a=1,b=2,ect)?

Jun 21, 2010

im a student still learning and im stuck. im writing a program that returns the ip address, splits it in to parts, and now i need it to return a string of letters for other parts to use. EX.

ip address 127.0.0.1 will look like ABG.XXX.XXX.XXA
( i would like to set 0=X so it is easier to pick out the actual
numbers)

I am able to split it and display each part and rewrite it to textboxes without the "." but i dont know where to begin to change the numbers to the letters i need.

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Get The Listbox To Accept Numbers As Well As Letters

Dec 7, 2009

My listbox will accept any letter I add, but I can't get it to accept any numbers. I tried a case select for 1-100 and I couldn't get that to work either,

Private Sub btnCount_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnCount.Click
'Determine word count and average letters / word in the sentence

[Code].....

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Calculation Is Throwing Me Crazy Numbers With Letters

Nov 10, 2009

I am creating a simple mathematical game in VB.NET for kids!!the game checks for some simple calculations!!I am having the problem regarding the if else block in the codehere is my code

[code]...

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Generate A Random String Of Numbers And Letters?

Jul 17, 2010

How can I generate a random string of 8 numbers and letters?

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Generate Random Alternate Letters And Numbers?

Apr 6, 2012

What I am trying to do is create a form with a button and a list box. When clicked the button will generate a list of 3 or 5 characters that have alternate letters and numbers...eg.

q2h
a6j
z4p
d9k

[Code].....

To complicate things a little, each combination needs to be different, ie. randomised but still according to the 'letter,number, letter' formula. There are plenty of examples of randomising strings such as passwords but I cannot understand how to achieve the above.

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Generate Random Numbers And Letters Combination?

May 23, 2009

I want it so that when someone clicks a button it generates a code in the format of XXXXX-XXXXX-XXXXX-XXXXX-XXXXX I want them to be letters and numbers combinations

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Getting Letters Instead Of Numbers In Extracting Area Codes

Jan 30, 2012

I'm brand spanking new to coding (as well as this forum). And I'm learning Visual Basic 2010 in School. Right now I am working on the following problem: "Use a masked text box to as a user to enter a phone number in a format as follows: (604)323-5819. Make sure you add input mask to the area code and phone number. Both the phone number and the area code are required. Then extract the area code and display it in a text box when a button is clicked." Here is my code, I've got it where I can input the number, and when the button is clicked (things actually appear in the text box!) however instead of getting the area code, I get "als" or alternatively if I put (0,3) I'll get "fals" I don't understand what I'm doing wrong or even where "fals" is coming from. Can someone please explain to me what I'm doing wrong? I've literally been at this since 4pm today and only just (midnight) able to get it to this point and I'm incredibly frustrated as to where these letters are coming from. [code]

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How To Make Random String Of Just Letters And Numbers

Jan 17, 2012

I have to (for class) make a program that generates a safe passwords for people to use. My teacher wants us to make the passwords vary in length, include numbers, letters and upper case letters. I've been able to write code that prints out a random string but it includes unrecognized characters for most passwords. How would I write the code to create a random string that has parameters? (in this case upper case lower case letters and numbers).

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LINQ - Sort By (Treat Letters As Numbers)

Sep 5, 2011

How should I use linq to sort my data when my data contain both numbers and letters? For example my current linq
Dim MyQuery = From c In XDoc.Descendants() _
Where c.Attribute(Y) IsNot Nothing And c.Attribute(Str) IsNot Nothing _
Order By Val(c.Attribute(Y).Value), Val(c.Attribute(X).Value) _
Select Str = c.Attribute(Str)

Returns something like the following
13
167
172
231
44
49
Which is not what I would like it to be...

The output should be like the one below:
13
44
49
167
172
231

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Making A Text Accept Letters Only Or Numbers?

Mar 9, 2012

how to make the values in a text box accepts only letters in the text box for data that are for letters only and numbers for data requiring numbers only

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Prevent Users Entering Letters Instead Of Numbers?

Mar 26, 2009

The app uses several forms to let the user enter information. In each form the info is entered into textboxes and dealt with elsewhere when the "Enter" button is clicked. A lot if the info entered is used in calculations and so must not contain alpha characters, only numbers. What is the best way of examining each entry and identifying any that are not numbers, so that I can ask the user for a correction with a MsgBox?Prevent Users Entering Letters Instead of Numbers?

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