Reiterate Through Large Collect 100 Items At A Time?
Jun 10, 2011
I have a routine that is supposed to grab all email addresses within a certain group. The email address list can be well over 1000 emails. When emailing it out though I can only send around 150 emails at a time. So what I i've done is executed a query and threw all the emails into a collection.
How do I now reiterate through the collection grab 100 addresses each time and call the routine to email that group?
Dim emailToGroup As String = ddlEmailTo.SelectedValue
Dim connStr As String = ConfigurationManager.ConnectionStrings("SNA_TRT").ConnectionString
[Code]....
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Jun 29, 2011
is there any real advantage to run a GC.collect after that our application has used a large quantity of memory or it is just a psychological factor?
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May 4, 2011
I have just written an app in VB 2010 with .NET 4.0 that contacts our field loggers to collect data via modem or IP. Originally it was written without threading, but now the requirements have changed and I need to collect data simultaneously from 4-6 sites at a time. I have never used threading, TPL, etc. Can anybody tell me where to begin so that I can concurrently run multiple collections?
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Aug 9, 2011
I have a large list of keyword and I want include this list in a listbox .How can I do it?
I tried by paste the list in the collection control but by this way the listbox allow only a small amount of keywords.
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Oct 28, 2010
I need to load a large txt file that is in a fixed width format. There are over 45K lines, so speed is important.I need to load one of the fields into a dropdown box and have another field (label) display the text of another field in the related line.I could import the file to an access db if needed, but would rather not as i also want the txt file to update from a link on a regular bases. So having it in a DB would be more work to process that part.[code]
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Jun 24, 2012
I ran into a problem where the listbox is taking awfully long time to show up. This is not the same in java(It took very very less time - one second max). So, is there any remedy to this??, any other form control??, or some other way?? imports System.Threading imports System.Windows.Forms
[Code]...
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Feb 8, 2011
I have 4k records in access database. And one of the field value contains ~100 lines each so and one other field has ~25 lines. So total database size reaches ~30MB and it takes lot of time 15-20 seconds to load the database in vb.net using odbc [URL]..and updating of any other small fields also takes time due to database being large
So as an alternative I used rtf file (txt files were not preserving all the newline characters). So these file are around 5-10kb only. But for 4k records and 2 fields I have now 8k files. And copying of these 8k rtf files is taking huge time for 5MB transfer it takes an hour or so.So is there any other alternative for storage of this data. So that it will be portable and easily loaded/accessed/updated from vb.net?
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Nov 23, 2010
I need to count a large amount numbers in short time.As a result the CPU jumps to 40-60% on 4-core PC.Which is extremely high.I have any idea that will lock up the thread for some time, but not actually slow or reduce the amount of files that are allowed to be counted per a giving time period.
Vb.net
Application.DoEvents()
Threading.Thread.Sleep(1000)
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Oct 31, 2011
I have 3 check boxes on a form and am trying to code them to change the font in combinations of Large Font,Bold Font, and underline font.I coded the bold font check box and large font check box but cannot get the Bold and large font to work at the same time.
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Jun 9, 2011
I want to write a program to do Markov chain, but my states are quite large. First of all I calculate all the transition probabilities and revenues for all states(1381860 total states), and store in a multidimensional array. Public RevArr(0 To 9, 0 To 750, 0 To 282) As Long
After that the iteration of markov chain should use these as inputs to calculate the steady-state probabilities. But when I try to run the main code I got this error.Exception of type 'System.OutOfMemoryException' was thrown.
The following is the declaration of second array I add just another dimension for storing all the iterations, but I get this error. Dim stateprob(IT + 1, 0 To 9, 0 To 750, 0 To 282) As single
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Dec 11, 2011
I wrote a program to download and play AVI files the files are large in size and long time wise. I have the files playing as they are being downloaded but i can't see how long the file is or seek reliably. i was reading that the AVI headers are in the last 512kb of the AVI file *why would't they put it at the start* lol so my question is is there a way to download the last 512Kb of the file i'm downloading. i have the Bytes Read and Length of the file while its downlaoding i'm just not sure where to go from there, or how to do it atleast. If i had the length in time of the Avi file i could set the trackbar to be able to seek properly. or if someone has an idea how i could get the time of the video by using fps and some math i could prob do it that way too but idk how i would tell how i can find how many kb are in the fps i'm sure it changes so think that way is't going to be reliable. how to get the last 512kb would be the best option not sure if it can be done even.
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Nov 18, 2009
I have 10 items in a listbox. (Just text) How can I display one item (text) at a time from the listbbox in a label every time a user clicks on the NEXT button. (The label will just display a new row of the listbox every time a user clicks on Next)
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Aug 22, 2010
I want to remove items from a listbox 1 at a time. I have two timers set up to remove the two types of items that are put into the list box. When there is a "Player 1 killed Button 1" following a "Player 1 killed Button 2" or vise-versa they get removed at the same time. Is there any way to prevent this?
Code:
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim XP As Integer
[Code] .....
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Jan 24, 2012
My application waits for the user to click twice to draw a rectangle on an image, and use the rectangle to create a clone and save it. Then it restarts with the next rectangle. When I work on a large image (10800x7236) after a few cycles I get an out of memory error. but I still don't understand what's going on, and I would appreciate if some expert out there clarified why it didn't work before and it works now. This is the snippet executed after the user clicks twice, and fails after 5-6 cycles:
[Code]....
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Apr 13, 2010
In c# I can initialize a List at creation time like var list = new List<String>() {"string1", "string2"};
[Code]...
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Sep 22, 2009
I add ComboBox column at design mode and I am trying to add Items in ComboBox at run time. How to add Items to ComboBox at form load
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Dec 14, 2009
I have a table of data exported to an Excel file that contains a Date/Time Field. The entries in the table are formatted like 01/01/2009 14:00 (military time). Every line in the table contains unique information that is specific to that particular date/time information, 1800 lines of data (the reason that I dont want to hand sort this table). How can I identify the items in the table that fall after a particular time of day? More specifically, I need to identify which of the data fields have a time after 14:00 on that particular day.
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Dec 4, 2009
I have created a user control that mimics what a label does. I realize I could have inherited the label control, but I am working on understanding the process. I wish to add items to the control. normally (in the code of my project) would do:
Form1.Label1.Controls.Add(mylabel)
After creating mylabel in the code of course.
[code]....
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Jun 21, 2010
I am able to have checked menu items show the variables that I need to show, but they don't uncheck themselves unless I go back and click them. I want to have only one checkmark on a country at a time...is there any way? I've tried if...elseif , but that doesn't work....example below (If I only want Mexico checked and NOT United States, but both are checked still).
If MexicoToolStripMenuItem.CheckState = CheckState.Checked Then
UnitedStatesToolStripMenuItem.CheckState=CheckState.Unchecked...
End IF
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Mar 11, 2012
I currently have code that creates and inserts ~175,000 names into a table.
What is the quickest way to collect a random first and last name? So far I have tried, Reading from two text files where every name is one line it takes ~2:30 minutes Reading from a table with [first][last] columns takes ~4 minutes
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Feb 24, 2009
Is it possible to change the text format of a ListBox selected item at run time?
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Sep 12, 2011
I have a multi-user app which consists of a Windows form (VS2008), and a SQL Express 2008 database. I'm already detecting if the dataset has changed before the user closes the form so I can prompt them to save their changes. What I'd like to do is to capture the changes they've made, and write them to a database table so that users can track all changes made to each record on the DB.What is the best way to grab hold of the data changes before they're written back to the DB and also grab the original records?
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Nov 18, 2009
I have a SQL server table that has a list of Usernames and a list of points ranging from 1 to 10,000.I want to display the number of points in my VB.NET program from the username given. For example, if I type in "john" in the first box the program will give me a message box saying whatever amount of points "john" has. I'm not really sure about
This is the Table Structure:
Usernames Points
-----------------------------
[code].....
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Jul 27, 2011
I have a class orderItem it is a parent of Product and service class Im adding product or services in a listcollection. How can I cast service or product for retrieving orderitem?
Public MustInherit Class OrderItem
Private m_enuItemType As TypeOfItem = TypeOfItem.None
Private m_strUserID As String = ""
[Code]....
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Jun 12, 2010
I have 4 textboxs in my new form. and each of them, i want the data from the db show in the txtbox.[code]...
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Feb 5, 2009
I collect two sets of data from two different databases, This data is now in two collections. I then join/append the one collection to the other and then put it in to a list view.I really would like to order this list view by the first column without the click event.To make this even harder the First column contains Data that is DateTime and i have found that it orders the items by the day number and not the months or years or time.I have found one way but it then cause's me further agony when doing some checks upon the data within the listview later in my code. This answer is to rearrange the format to "yyyy-MM-dd HH:mm:SS" then using the listview.sorting = sortorder.
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Mar 11, 2010
i want to create an application that collect data from the rs-232.Someone have a code example with multi rs-232 in thread .I have one pc that have mapping virtual com.
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Dec 31, 2010
What I need to do is have my application check to see if the last hour that was inserted into the database table is equal to the current hour minus 1 hour when it runs. If it is not equal to the current hour -1 then it needs to go back and download the missing data automatically.
The hours go from 1 to 24 with midnight being the 24th hour as you'll see in my code. My problem is I don't know how to code what I'm trying to do.
Here is the current code:
Private Sub HourDownload()
DeleteFileHour()
If OneHour("C:abcd.pfx", "******") = True Then
[Code]....
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Feb 1, 2011
I'm using the .NET SerialPort class to communicate with gauges. Every time a button on a gauge is pressed a reading value is sent over port. The problem I have is that if the gauge button is pressed while the program is off then when the program starts it fires the data received event for that existing data. I don't want this behavior -- I only want to collect readings done after the port is opened.
port = New SerialPort("COM1", 9600, Parity.None, 8, StopBits.One)
port.Open()
port.DtrEnable = True
System.Threading.Thread.Sleep(100)
port.ReadExisting()
AddHandler port.DataReceived, AddressOf PortDataReceived
If I don't have the Thread.Sleep then the DataReceived event is fired for the previous gauge data. I'm guessing this is because the ReadExisting doesn't block and so when its called immediately after an open it just reads nothing. So if you call 'port.BytesToRead()' immediately after open its zero. If you call it 100ms after open its non-zero. I guess this makes sense -- it takes time after open to read the existing data. Another option is to call read and set the read timeout but that seems no different than Thread.Sleep except you have to catch an exception...
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Dec 10, 2009
I have a windows app (2.0 framework) that's about 860k in size, just a small db app with a couple of data entry screens and a few reports (Cystal) I noticed that when the app starts the mem usage according to task manager is ~11,000k viewing just one report jumps the mem usage to 56,000k. i thought i could reclaim some of that memory by adding some GC.COLLECT() callls, but no luck. Mem usage stays the same in task manager.
So I made an even smaller test app with two forms....Form1 has two buttons , button1 Opens Form2, and button 2 calls GC.COLLECT()
From 2 contains a datagridview and 1 button. The form load for form2 executes the fill for the dataset that populates the datagridview and the button on Form 2 closes the form.
Here's the code for each form....
CODE:
No matter what I've tried so far I cannot seem to reclaim mem that gets used.
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