i'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 RepliesHow to check a check box based on a condition at run time?
View 3 RepliesI have a button and i want it to check for a condition to display different msgbox.
Below is my code:
Dim a As String = "";
Protected Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
[Code].....
But i got the following error when i clicked on the button.
"Input string was not in a correct format. "
In my program, I have a condition I need to constantly check for. When my program gives an error, I change a label to a different text, lets say "fail" for now. I'm trying to make a condition where the program constantly checks for the label change to "fail" from the start of the program. I am having trouble trying to get this to work.
View 4 RepliesI'm using a loop condition to check if there is null value in the columns, then remove it.
-Original author
[STart:]
For i As Integer = counter To dt1.Columns.Count - 1
For x As Integer = 0 To dt1.Rows.Count - 1
if some condition then
something = true
[Code]...
Sometimes it runs correctly and sometimes even though when i becomes greater than (dt.columns.count - 1), it still executes the for loop and throws an error that there is no column with that index. I must be missing something here but I'm not able to debug the issue.
I share my internet connection with other users through LAN. There's some one who keeps cutting me off from time to time to increase his download speed.I know that there is some orders that can be written in the command line to reconnect to the internet after every cut but I don't know them.I started teaching myself programming under VB 2008 Express as a hobby few weeks ago. I was wondering if there is a way to write a program in VB to check the connection condition every few milliseconds and reconnect again to the real gateway till the attacker get bored.
View 25 RepliesThis is probally more of an elegance question than functionality. I am looking for the absolutely safest way to check for an integer from a string and an object,
Using most of the built in functions for this in .net seem to generate a first chance exception, displayed in the Immediate window, and over time they just build up. what are the implications of these exceptions as they don't seem to affect the operation of the system.
Here are my two attempts, both feel clunky and I know there has to be a better way than using VB.IsDBNull and Integer.TryParse... Or am I just being anal.[code]....
I've just begun using VB2008 Express. As practice, I'm trying to create a simple program that allows users to practice their basic arithmetic skills. I've just run into one hiccup.
I have a procedure that generates random numbers for the program to spit out as text that the user will then do arithmetic on. I'm trying to create a loop that checks, in the case that a radio button selecting division practice, that the potential quotient [code]...
I am doing a project.."Some Password". the criteria is that the password should have 1 numeric and 1 non numeric and atleast 6 characters. The code I worked on..(below)
Function CheckPass as Integer
Dim
blnContainNumber As
Boolean
Dim
blnCotainNonNumeric As
Boolean
[Code] .....
When I compile this code...it gives me a Messagebox error that I wrote.."Password Invalid" even though I type the password that meets the criteria. I think the problem is that I don't have..."if atleast one numeric then" and "if atleast one non numeric then"...
Basically, when you set an Integer to "Nothing" it seems to equal the same value as if you were to set it to 0. So, in a function that returns an Integer how can I return something that will show that the function failed? In most cases I would use -1 or something but in this case I need to allow for negative values too.
Here's some more detailed information: I'm using the GetValue method of the Microsoft.Win32.RegistryKey class to read a numeric value from the registry. The GetValue method has an optional argument that you can pass in that specifies what should be returned if the value did not exist, normally I would use Nothing but in this case because I am storing the returned value in an Integer then it is just the same as if the GetValue method returned 0 (which is a valid value in this case).
Example:
vb.net
Dim Reg As Microsoft.Win32.RegistryKey = My.Computer.Registry.LocalMachine
Dim SubKey As Microsoft.Win32.RegistryKey = Reg.OpenSubKey("SYSTEMCurrentControlSetControlTimeZoneInformation", False)
[Code].....
I use this line of
If MADS.Tables(0).Rows(1).Item(13).value >= 0 Then The value of item 13 is negative and it�s a double. Still the code in the condition is executed?
In TSQ IF MyVal IN (1, 2, 3, 4, 14) BEGIN ... END .Is there a way to do this in VB.NET? Is it possible to check for the existence of an integer in a set of integers inline? Such as: If MyVal in (1, 2, 3, 4, 14) Then ... End If
View 2 Repliesi need to take input in text box that will be integer. when the button is press it will check whether the input is integer.
can i do this using isNumeric Function?how?
I want to Refresh DataGridView according to any condition (e.g. I changed the color of letters in cellls). This condition is set by another form (it closes when the condition is set). How can I do it?
View 11 RepliesI cannot figure this one out.. I have a background worker that will perform a task streaming data from some webpages. this data is then passed back and displayed in a gridview. It has been working fine.
I've recently implemented a listbox, which its values will be passed into the function that the background worker will perform as parameters, originally i had taken a single value from a textbox.
Now, I thought maybe it had something to do with the listbox, so I used a static value, just a simple String, as the parameter, and again, I get the TargetInvocationException was unhandled.. There's no difference in how I perform the task I'm trying to have the backgroundworker complete, the only difference is where it exists in my if condition statement:
Private Sub BackgroundWorker1_DoWork(ByVal sender As System.Object, ByVal e As System.ComponentModel.DoWorkEventArgs) Handles ScrapeSites.DoWork
Dim results As ArrayList
Dim worker As System.ComponentModel.BackgroundWorker = DirectCast(sender, System.ComponentModel.BackgroundWorker)
[Code]...
I have a list of string in an array. I'm loop through those strings and if the text of a combo box matches one of those strings, I want a message to appear. If they don't match, I want a method to be executed.
[CODE...]
The messagebox appears, but the method is still executed. Which means it isn't stopping when it finds the match. I tried exiting the loop, but it still doesn't work.
I need to open a form 6 times, I have the following
[Code]...
But when I click the button 6 times all the 6 forms open, but when I close one and click in the button to open again (since I only have 5 opened) the compiler says that I need to sure that the object isn't in use before using it again.
I want to do smth like instead of typing
vb
Timer1.Start()
I can type
vb
TimerA.Start()
where A is a random integer declared before.
I want to be able to add only a certain context menu to Windows Explorer when a condition is met, that is, when a folder is right click, I should be only add the context menu if that folder is in a certain state.
View 1 RepliesI read a string from the serial and I have to check if it matches another string .the condition "If .. Then" never occurs, I think because of the characters carriage return and various codes are present but not visible ... how can I fix this?
[code]...
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 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 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 Replies