I'm populating a checkedlistbox with this loop.
Dim week As Integer
For week = 1 To 51 Step 2
CheckedListBox1.Items.Add(week)
Next
And get this result 1 3 5 7 9 11 13 etc.
This is how I want it 01 03 05 07 09 11 13 etc.
I'm trying to convert an integer (0 to 255) into a 2-value hex string. For instance, if the integer was 255, the hex string would be "ff", if the integer was 15, the hex string would be "0f". The issue I'm having is trying to keep the leading 0. I've been able to overcome this by using an if statement to determine if the length is less than 2, in which I would concatenate a 0, but this is pretty inefficient I think. Here's my
Dim get_integer as Integer = TextBox1.Text Dim hex_value As String = Convert.ToString(get_integer, 16)
If hex_value.Length < 2 Then
hex_value = String.Concat(0, hex_value)
End If
how to improve this? I really would like to get away from using the if statement.
Im wondering if how to convert 02/14/2012 to this format '20120214'
I want do save date in my database in that format...because I see it more flexible
I have a function which takes in an integer value. I want to be able to grab the first digit (or the first and second digits in some cases) of this integer and do something with it.What is the best way in VB.NET to get the first digit of an integer (or the first and second)?
View 6 RepliesI just finished this application where you enter a five-digit credit card number, with the fifth digit being the check digit. everything seems to work except, I can't seem to get it to determine that any number is "valid". Every 5-digit combination that I enter returns "The credit card number is not valid". Im using visual basic 2008 express
[Code]....
I'm supposed to write a program that validates an inputted ten digit ISBN number using the check-digit at the end to ensure that the sum is a multiple of eleven. Before calculating this and detecting if the entered number is indeed a valid ISBN, we're required to check the first nine digits and see if they are indeed integers. After this the tenth digit is checked to see if it is "X" (for ten) or 0-9.
With the code I've written it keeps returning false for whether or not the ISBN is valid, even with valid numbers. I feel like its something to do with the hyphens; have I misused the replace function?I'm a little lost on how to make my code work, but I'm fairly certain my logic is okay so far.
[Code]...
I'm making a project that randomly picks a number from an array, but if it picks a number less than 10 then the number is a single instead of a double.
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim N(2) As Integer
N(0) = "0" & 1
N(1) = "0" & 2
N(2) = "0" & 3
[Code]...
Ok, I have like this:
Public basic_numbers(10) As Integer
basic_numbers(0) = 0
basic_numbers(1) = 1
[code].....
How to I convert/format a textbox entry 0215 to either 02/15 or 02/15/2012
View 3 Repliesi want a button to perform a function of checking the last digit number in a field of a table in and add a digit to it and display it in a textbox.
View 1 RepliesI'm using Visual Studio and table adapters using an Access DB as the backend. I need the minimum 4 digit value. I want to get next available 4 or 5 digit number. And this will change depending upon the users request. Currently I use a table adabpter query. But how would I write a query. I suppose I could do a long iterative loop through all values until I see a 4 digit.But I'm trying to think of something more efficient.
Function GetNextAvailableNumber(NumofDigits) as Long
'SQL Code Here ----
'Query Number Table
[code]....
I am trying to parse several strings to integers where I both tried cINT(string) and Integer.Parse(string) but it seemed to fail at the string 'h1', I think I need to use substring for this, but as the input can be different decided by the user, it is kinda impossbile to use substring, as I do not know how to locate the integer in the string..
View 10 RepliesFor my ToDo list I have these data: Activity, date, start time, end time.I have 2 listboxes. The first listbox stores the activity and date.The 2nd listbox stores activity,date, start time and end time.With a button I can hide/show the 2nd listbox.
View 7 RepliesJust started programming with visual basic 2010 after programming a lot with vbs (Visual Basic script) it looks a lot like each other but there are a couple of differnces so here are a couple of questions.
1. What is a integer and what is a string?
2. Can i code an own sub? so it works at all times and not only when i " do something" (press a button or something like that)
for example: if progressbar1.value = 10 then msgbox " well done" now i can only add this line when i connect it to a button or something but i want to connect it to all the lines.
3. whats wrong with this line?: WebBrowser1.Navigate [URL]
convert this C value for me?
Value : 0x00000000L
I am taking a business application development class right now and am learning Visual Basic. One of my homework assignments is to calculate the grade needed on the final exam to get an A in the class depending on the midterm score entered by the user. My question is how do I display an error if the value entered is a letter instead of an integer?
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim intMidterm, intFinal As Integer
intMidterm = CInt(TextBox1.Text)
[code]....
I need to get the integer of an image which is located in an imagelist. Dim _blue As Integer = CInt(frm_main.Imagelist1.Images.Item(1)), but image can't be converted to integer.
View 1 Repliesi'm starting to learn VB, i've wrote a few little programs following the books and internet resources, so far so good until now, i have to check a range of double integers(e.g. 170-50) if the left integer is == 170 and the right integer is == to 50 then you profit.i have to do this about 200 times but i just need a litow to get started, i've searched for about 4 hrs and read for about 5 and still nothing.
View 2 RepliesDim table As DataTable = par.Tables(0)table.DefaultView.RowFilter = String.Format("Patient_Number = '{0}'", txtPatientID.Text) txtPatientID.DataBindings.Clear()txtPatientID.DataBindings.Add("Integer", table, "Patient_Number") DataGridView1.DataSource = table
However I get an error:Cannot bind to the property 'Integer' on the target control.Parameter name:PropertyName
This is one of my first forms so I'm sure there is quite a bit wrong with it. It works to a good degree but my issue is, Although I'm asking and checking for an int. If I put say 1.1 in a field it still lets it go. I'm sure I'm missing something very easy but I've been messing with it for hours.
Public Class frmStadiumSeatingCalculator
Private Sub frmStadiumSeatingCalculator_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
[code].....
Basically I want to store an integer efficiently. At the moment I'm using Button1 Click' Or whatever I need it for Label1.text+0 But to do this I need to add in another Label and set it to visible.
View 6 RepliesIs there anyway to customize a variable to use both an integer and a boolean value?For example. I am kind of making a simulation engine and using GDI as a visual aid, I am generating a grid of tiles for objects to be displayed, but I do NOT want to repaint all the tiles just the ones that have changed, so that I can save fps.So I thought if I could set a variable for the "tile number", "how many objects there are on a tile", and a boolean value for whether or not the tile needs repainted.[code]
View 2 RepliesTo use code to select an image for a PictureBox I can do this:PictureBox.Image = My.Resources._1, where 1.png is the name of the image file I want seen in the PictureBoxI want to use a randomly generated integer to select which image is seen in the PictureBox.5 would select 5.png12 would select 12.pngThe .png files are already in the Resources folder.I can generate the random integer and have it in an intVariable but I don't know how to use it to to tell the PictureBox Image property what to do.
View 2 RepliesI am having problems removing an item from a List(Of Integer). I see you can remove it by doing a remove with the index, but I assume you can do some type of function where you provide the value that you want to remove and it removes it. I found it on the List(Of String), but not Integer.
View 1 RepliesIs there an easy way to search through a List(Of Integer) and find duplicates? Or do I need to do loops to search through it with each number, comparing it to each one?
View 3 Repliesive got some simple problem i cant understand how to solve.
str(1) is an array and integer(or double, tried both)
a(1) is an array and integer (or double, tried both)
a(1) = a(1) + 1
Label1.Text = str(1) + a
the big part is where i get: operator '+' is not defined for types 'integer' and '1-dimensional array of integer'.why do i get that message and what does it mean? how do i make the code do what i want?
I faced an error when upgrading VB6 code to VB.NET. The error occurs at AddressOf WindowProc
AddressOf expression cannot be converted to 'Integer' because 'Integer' is not a delegate type
My declaration for SetWindowLong is:
Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA"(
ByVal hWnd As Integer,
ByVal nIndex As Integer,[code]....
What is the reason for the error I get?
I'm trying to create a linked list of an array of integers. Why is the following implicit conversion required?
When I run the code that contains that conversion, I get the following error.
As a real-time data acquisition user control data (a packet of an array of bytes) arrives every second, is converted into an integer array and inserted into a linked list.
The most recently arrived data is painted as coordinates on a grid at the right of a PictureBox using Graphics.DrawLine (pen,X1,Y1,X2,Y2).
The oldest data (arriving 120 seconds ago) will be drawn at the leftmost portion of the Picturebox.
Why a linked list rather than a list? To display 120 views of time sequence data, the draw routine the most recently inserted node to a node that points to Nothing. How do I limit the length of the linked list to 120 nodes and always ensure that the last node points to Nothing?
Do While Not item Is Nothing
item = item.NextItem
Loop
I have an application that deals with some rather large number values. I wanted the values to allow a roll over so I compiled the program with Remove Integer Overflow Checks turned on. The 32 bit numbers roll over just fine but the 64 bit unsigned integers still throw an over flow exception. Is this a bug in the compiler?
View 7 RepliesI have a program that will round any numbers I give it regardless of the data type I set (I've tried double and decimal) before it saves into the DB. I'm using MS access for the DB and I've set the data types in access to Numeric Double, Numeric Decimal, and Currency and all with decimal places set to 4 -- all to no avail.
What I do know:
1) The textboxes on the form accept the number value as I enter it and after I hit save the value displayed is the same as the number that I entered. However, once I query the database again for that entry the value has been rounded up/down to the nearest integer (whole number). For example: I enter 1000.50 and hit save. I search for that same entry and the value is saved as 1000. If I enter 1000.51 and hit save then search for the entry it shows the value saved as 1001.
2) I can store the desired value directly into the DB by manually entering it. When I search for that entry from within the program it displays the correct amount. HOWEVER, if I try to change the amount and then hit save I get a concurrency violation.
I think that it may be a setting somewhere in the program that doesn't allow for decimal places but I've search everywhere and I cant find anything.
