I used this code to prevent write letters in TextBox only numbers. but I couldn't use the backspace key . how can I use it with this code
vb
Private Sub txtTelN_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles txtTelN.KeyPress
If Char.IsNumber(e.KeyChar) = False Then e.Handled = True
End Sub
i m trying to write a program that displays in a textbox a table of the binary, octal, and hexadecimal equivalents of the decimal numbers in range 1-222.
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 want to make the addition of two numbers and to see the result during i write them no button click
View 21 RepliesI am trying something new and that is VB2008. I have two numbers 12 and 15. I have made my form but now I need to make the code. I need to make a code that takes two numbers 12 and 15 and gets the max number out of those two numbers, which is 15.
View 2 RepliesBasically wat i'm trying to do is continuously write numbers from 1 to 10000 using 1 thread & stop this using another thread. But it doesn't seem to happen.
I have pasted the code for your reference.
Imports System.Threading.Thread
Imports System.Threading
Public Class Form1
[Code].....
I have one textbox and one label i want to see the distances between the numbers imediately when i write them example 1476=365-32-1
View 39 RepliesIn need to write the number 7.2 in a table field. What type the field needs to be. And what type needs the variable to be?
View 1 RepliesHow to make validations for textbox allow numbers only or textbox allow letters only?
View 14 RepliesI was given an assignment to "write a program to print only even numbers between 6 and 16 using events", but I don't even know where to begin. The main thing I am having difficulty with understanding in this assignment is how I am supposed to specify that it only print even numbers in the given range of numbers.
Am I going to have to do a Mod2 code for each individual number and have it exclude any with the result of 1? Or is there another piece of code specifically designed for such an occassion? Perhaps there is some type of equation I can have the program read in terms of a variable, which holds the values of 6, 8, 10, 12, 14, and 16? I am just genuinely confused on how this is supposed to be programmed.
I want to open a txt file and write into it numbers from 1 to 100 and put between every number enter.
View 4 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 RepliesIam trying to write code that read integer numbers from user (intered in form) and put it in array and then i will do some calcuation.I declare The array z and index of array p at begining of the class (global), I dont specify the size of arry couz that it depend on user.
If CInt(l1.Text) >= 0 Then
z(p) = CInt(l1.Text.ToUpper)
l1.Clear()
l1.Focus()
[Code]...
So...numeric sorts. Do I really need to write a custom comparer to make a listbox full of numbers sort itself like:
[Code]...
I'm currently in VB class at my highschool and we just got chapter 6.1 to read on this online textbook that we follow. Anyway, we are doing loops now and the problem reads "Write a program to request positive numbers one at a time from the user in an input dialog box. The user should be instructed to enter -1 after all the positive numbers have been supplied. At that time, the program should display the sum of the numbers." So far I know this much
[Code]...
Now I know this isn't right But I can't find out how I'd pull out the numbers the user entered to get the sum of them and not include -1 because as it stands, when I hit ENTER with -1 the label just shows -1.
How I can do this? generate Textbox and button, If I write 5 in textbox? 5 Labeles will apear
View 3 RepliesI am writing a program where I would like the user to be able to save the contents from multiple textBox into a file and the retrieve the contents late.
View 5 Replieshow can i make it so my textbox can only have numbers in it
View 2 Repliesis there a way to allow only numbers in a textbox?
View 6 RepliesI have textbox and it has keypress event , I want users to allow only numbers
View 19 RepliesI have a textbox where the user inputs the employee number, but it must only accept numbers.
I have coded some lines in the textbox's TextChanged event and almost have it. but when I adjust it to eliminate other characters it triggers itself (recursive). that is not a big problem since the second time does nothing but I dont like the unprofessional way its handled.
But the real problem is that I cant get it to stay "blank" when the user erases all my code always puts "0" on the texbox.
Another thing is that when a non-numeric key is pressed, after the code dismissis it, the cursor goes to the start of the textbox messing up the input.
I've made a textbox which MUST contain 4 numbers. If there are 3 numbers (or less) you'll get an error or something. I already changed the tabindex to 4.
View 3 RepliesI want to make a routine named "NumberOnly Private Sub TextBox4_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox4.KeyPressNumbersonlyEnd subAll textboxes must accept numbers data on which I call this routine
View 5 RepliesI am doing a project on abstract the numbers that i get from the datagridview to append it on the other textbox. Ok I elaborate more. I have 2 form which is form1 and form2. For the form1, the view is 2 textbox and a 'To' button. when click on the 'To' button, it is direct to form2 which is the datagridview. After selecting the selected numbers, it will display the numbers on the form1 of the one of the textbox. but the problem is I want to abstract one by one of the numbers and append it on the other textbox of the form1.
View 9 RepliesI am doing a project on abstract the numbers that i get from the datagridview to append it on the other textbox. Ok I elaborate more. I have 2 form which is form1 and form2. For the form1, the view is 2 textbox and a 'To' button. when click on the 'To' button, it is direct to form2 which is the datagridview. After selecting the selected numbers, it will display the numbers on the form1 of the one of the textbox. but the problem is I want to abstract one by one of the numbers and append it on the other textbox of the form1.
View 1 Repliesok the problem is that when a button is click I want it to add 1 (+1) to a textbox. This process will keep on going on till I tell it not to...How would I just keep a running total of whats happening in the textbox...What I mean to say is that if I pressed the button 10 times, instead of it showing:111111111 I want it to automatically add the numbers up to show 10 instead.
View 1 RepliesHow 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
View 2 RepliesI recently have had lots of problems getting a text box to display only numbers or special characters and or letters only. Much research on past posts just compounded the problem as the code is either for previous versions or other language. So I thought I would post a bit of code that works great with VB 2010
Private Sub TextBox1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox1.KeyPress
e.Handled = True
[code].....
You Know Your Addicted To Computers When - Your main computer is a 7 terabyte, Core2Quad 3 Ghz +, with 4 or more gigs ram, over 200 programs installed, and you would rather sit with it programming than go to the movies!
I have a problem in putting the telephone number using the datagridview. I have build 2 forms which is form1 and form2. In the form1 there are 2 textbox and a 'To' button whereas in the form2, there is a datagridview which display the telephones numbers and a button. When run the application, the user need to get the telephone numbers from the database so that is why when clicked on the 'To' button, it will go to the form2 which is the datagridview. After selecting the telephone numbers and click on the button at the form2, the telephone numbers will be display at the form1 first textbox. But the problem is that, I grab the telephone number which has been display in the form1 first textbox to the second textbox in the form1. I could not get the telephone numbers.
View 1 Replies
