VS 2008 : Finding Primes Within A Range?
Dec 4, 2010
I am attempting to calculate a range of prime numbers determined by two user inputs (textboxes) I have the following code, but it displays nothing but zeros in the multiline textbox. I just need a bit of guidance here as to what is causing my code to show nothing but zeros.
Public Class PrimeNumbers
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim lowBound As Double
Dim upBound As Double
[code]....
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Aug 2, 2011
I have an Excel template that contains numerous pre-defined charts and a program that opens this template and collects data used to populate the charts. This works great but I now want to adjust the series length so that the charts only used the data collected (not a range of 32000). I'm trying to iterate through the charts and determine the range for each series of each chart but not having much luck. The snippet below allows me to see the xvalues but does not return any information as to where this data is located. Does anyone know how to extract the range for each series in a chart?
[Code]...
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May 26, 2012
Is it possible to develop a program in vb.net which can find the location of vehicle in a cctv camera range?if possible ,what are the APIs and technologies used for it?can any one suggest any link or the steps involved in this process...?
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Jun 27, 2010
I salvaged the following piece of code from:[URL]...This code works fine, but the problem comes when I need to get all the primes above 100 million. I am familar (at least a little bit) with the BigInteger class in .NET 4.0, but when I replace all the instances of "Integer" with "BigInteger" in the following code I get this error: Value of type 'System.Collections.Generic.List(Of System.Numerics.BigInteger)' cannot be converted to 'System.Collections.Generic.List(Of Integer)'.
(The reason I need primes above 100 million is that I'm trying to work through some projects on www.projecteuler.net)Anyone have some ideas on how to modify the code to work with BigIntegers,
[Code]...
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Mar 25, 2010
I am getting the error:"Range variable 'sender' hides a variable in an enclosing block or a range variable previously defined in the query expression."for this
Imports System.Data.SqlClient
Imports System.Linq
Public Class Form1
[code]....
I can select any other item from the table without the error. "sender" has the same properties as "receiver" in the SQL table.
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Dec 14, 2009
I am using the following code in the Load method of a VB form to generate random numbers in the range 1 to 8. Without fail after enough loops the range is exceeded and 9 is the random number returned every time. The line using the Rnd function is from: Rnd Function (Visual Basic)
[Code]...
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Dec 5, 2009
I'm running VSE 2008 and have an app with a datagrid built into it. The datagrid has a column for weblinks which when clicked open up a webform within the app. Problem I'm running into is when the column header is clicked it gives me an error..."ArgumentOutOfRangeException was Unhandled - Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index"
Here's the line of code I'm using:
[Code]...
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Jan 17, 2012
i was making program that updates data in the datagrindview1 in form1 to the form2 but after i click update in form2 im getting an error Index is out of range.[code]
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Mar 16, 2010
I've been looking around, but just can't seem to find any code that checks if a certain wireless network (with an SSID of "HomeWifi," for example) is in range of the computer.
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May 1, 2011
code CrystalReport by two DateTimePicker but get error "Mismatched data types in criteria expression"
This is the code
Private Sub btfechascrystal_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btfechascrystal.Click
[code].....
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Aug 24, 2009
[URL] That's a picture of the error. For some reason, it's saying that CurrentPlayer is < 0, but I stepped into the program and it said that CurrentPlayer was 0.
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Aug 26, 2011
Below is my code wherein i am showing a query based on items selected in list box... My problem is that when i m selecting all the items in list box , results are showing but if i m selecting some items, it gives Index out of range error....
vb.net
Private Sub btn_show_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btn_show.Click
Dim prod_name As String = String.Empty
[code]....
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Mar 19, 2009
What i got is a checkedlistbox with a list of text files, iam trying to search thru the text file and add to a listbox, my code works, But from 2 Txt files its returning 2 found and each txt file has 5 lines with excat names.
[Code]....
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May 14, 2010
I have a problem that I�m sure will not be hard to fix for anyone who has been using CR for some time.
To start I have created a program in VB2008 that uses a MS Access data file, I can connect to it with no problem and can also add data and amend data, so all seems to work perfectly. I have published it and it once again runs perfectly on another/s machines.I have now a requirement for a number of reports so have chosen CR for this purpose. I have connected the report to the database and that runs with no problems at all, that is until I try to run it on another machine, it seems not to be able to find the database and comes up with a database Login panel wanting me to log in with a password and Admin name.
I feel it's properly a problem with the path to the database but if I modify the path manually it still won't work.
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Aug 13, 2011
the program works fine but there is the possibility of a problem because this error message did pop up.I'm gathering my data bytes in an array --
dim rcvdata(19) as byte
serialport.read (rcvdata,0,20)
serialport.close
(Then decipher the array).But Should I go further with this? Could the error be related to my serialport.read?What if there were NOT 20 bytes read into the array?I think this may be it? I should poll the array for 20 bytes before proceeding?Yes? -- (It's a given and that's standard procedure).No? -- Don't worry, they're going to be there (the read will try again if it has to?) It won't proceed without the 20 bytes?
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Aug 31, 2009
i have an app that pings all IP's on my network and then adds all alive hosts to a list, then my WMI query runs for all of them ips and gets some information. it all works fine except for when it gets to printers and switches/routers which obviously dont support WMI. Is there some way i can check if a device supports WMI and skip the query if it does not?
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Sep 21, 2009
G:DevelopmentDOT NET DevColony_4ImagesBattenhallAve_Plan.bmpand i want to find and return the value after the last '' for example in the string above i would want to return:BattenhallAve_Plan.bmp
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Oct 15, 2009
I'm connected to an access database using VB 2008.. there is information already located in the tables. But what I am looking to do, is find the "SUM" of all the data in a certain column.
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Jan 1, 2010
I'm trying to work out a bit of a memory leak and was hoping someone can assist. The below program is running fine except for one thing. 1. The memory leak. When I run the program and watch task manager, I can see the memory usage of the program starts at roughly 14 meg. Over a period of hours, that increases pretty substantially. Eg. at 6am this morning, it was at 14 meg, and by 3pm it was at 36 meg.In a nutshell this program takes an incoming stream of data which looks like this.
MSG,3,51,350,461D3B,1427,2007/02/24,10:58:35.441,2007/02/24,11:03:35.829,,33975,,,53.82440,10.19830,,,0,0,0,0
MSG,3,51,673,44CE6D,1429,2007/02/24,10:58:35.098,2007/02/24,11:03:35.829,,39000,,,53.87798,9.88422,,,0,0,0,0
MSG,3,51,350,461D3B,1427,2007/02/24,10:58:35.848,2007/02/24,11:03:36.829,,33975,,,53.82353,10.19696,,,0,0,0,0
It basically parses the stream and places items into hash tables depending on the type of data. Eg. I have a hash table for latitude, one for longitude, one for altitude, etc.The key is always the hex code eg. in the first line above the key would be 461D3B.Essentially, as the data arrives in and is parsed and placed into hash tables depending on the type of data, I also have another hash table dedicated to keeping track of timeout times for that individual piece of data. The timer event fires and if the timeout is exceeded for that piece of data then it gets removed from all the hash tables.
I believe this is working. I've done heaps of debug output to the output window ensuring that items are being added to and removed from the hash tables successfully. Eg. ensuring that the hash table record count matches what I believe the number of active records should be.I'm at a loss what could be causing this memory leak though. I'm assuming i'm not disposing of an object properly, or not initializing/declaring it properly, but I can't work out what i'm doing wrong.One thing i'll mention though. The timer event occasionally comes up with a warning about the contents having changed during the For..Next loop. I don't think this will affect things though. As long as the hash table item count matches what it should be, I don't see that being an issue.
Imports nsoftware.IPWorks
Imports System.Data.SQLite
Public Class frmMain
[code]....
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Mar 23, 2011
I am needing to locate a given set of numbers in a string, and have limited success, it is almost always finding the numbers that I want, but I need it to be more reliable.Below is a test program that I am using to test with and also 2 picures that may explain better that I can put into words.
[Code]...
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Jul 27, 2009
I have a string. I need to check what characters it contains because certain invalid characters are causing my sql query not to work. In the query I select where SupplierName is equal to the string. I need to replace the invalid characters at database and vb level. But I need to know first what the characters are.
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May 23, 2009
I got a situation where i have the first word only of a a child window and the rest of the name changes. I need to find this child window using findwindowex i think by not knowing the full name.
Searching the processes wont work since it is a child.
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Jul 8, 2009
Alright, my program requires a folder to put the save files in, and it works fine to create it when I know where the program was installed to. I want to assume that everyone will install to C:/Program Files... however, one cannot assume. Is there a way for me to find out where the program was installed to ie. D:/WorkPrograms/ProgramHere, instead of the Program files? Specifically, is there some sort of code that I can run at startup to find where the program file is, so I can keep all the save files in there?
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Mar 13, 2011
I am trying to find the position in a string of a perticular letter of the alphabet (Q), I have found a method to determine if the letter exsists in the string, but not it's position.
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Nov 7, 2010
I've been practicing how to use Loops. So I'm trying to create a program where a user enters 10 letters and I have to find which character has the smallest ASCII value.
example: If someone inputs "qwerTyuio" my output should display "T"
Now I think I got my program to get the ASCII values of a string but I can't figure out how to compare each ASCII value of each character.
Dim str, y As String
Dim x As Integer
str = txtLetter.Text
[Code]....
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Mar 4, 2010
I need a variable divider ex. i have numbers from my textboxes in the range of 20 to 60 i want a divider that will divide them in a range of 2 to 6 so if the number is the lowest 20 the divider will divide him with the lowest of his range number 2 if the number is 40 the divider will divide him with the number 4 if the number will be 45 the divider will divide 4,5 and so on a variable divider.
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