Like in mathematics, can we somehow define variables which are only valid inside a specific interval? For instance defining a variable like this: f E <5, 10> / 7 Read: f is element in the interval between 5 and 10, except 7.
View 4 RepliesI am calling this function when a button is CLICKED and received the error; The name "The" is not permitted in this context. Valid expression are constants, constants expression, and (in some contexts) variables. Column names are not permitted. Unclosed quotation mark after the character string 'True)'.
The function is as follows;
Private Sub Save()
Dim conn As SqlConnection = GetDbConnection()
Dim query As String
Dim cmd As New SqlCommand
Last year (2010) I came across a FANTASTIC command that allowed me to take a string of variables with a common delimiter and break it all back out into separate variables (possibly an array) with one statement.
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As long as the delimiter was a unique specifiable character, this one-statement command could break it out into elements. my memory and point me in the right direction.
I have code, shown below, that works all except for 1 thing: The variables being passed byRef get passed, but once modified in the else section of the "if me.invokerequired" code of RecordData, the variables are never updated in the calling function. To reiterate, the calling function does not receive the updated data that is in the variables custid and amt.When debugging, I see the data change in the else section of "if me.invokerequired", but once it returns from the callback the data is missing.[code]
View 15 RepliesI define some global variables of a class as follows:
Private Class MyClass
Private var1 as Decimal
Private list1 as List(Of string)[code].....
But I found that after this form is closed, all above variables, var1, list1, list2 still exist in memory. I thought they should be collected by gc since the form is already disposed as I confirmed.
Add: I have monitored half an hour after the form is closed. But these variables are not collected by gc. I have an automatic update procedure on the form which uses above variables.Since the above variables still hold values, the automatic update procedure is always called which causes exception. (One quick fix is to check if form.isDisposed in update procedure. But I do not think this is elegeant. Besides, these variables occupy memory.)
I want to connect my vbform having two textboxes with a button.Each textbox will display some value from connected database in a loop (with interval of 5 sec for each value) on pressing button once.
View 10 RepliesI Have a lot of numerical interval, never overlayed and not necessarly contigous, like this: 1-10, 11-56,90-134. how can I determine if a given interval, for example 45-90 is completely external to the other intervals?
View 3 RepliesI would like to know how to set the interval of QueryPerformanceCounter, and create subroutine with the tick event, that particular code is executed in the specified interval.I can do this in the Timer control, for example:
[code]...
But I want a more accurate timer.I read that QueryPerformanceCounter is more accurate but did not understand how to set the interval parameter and create a routine to perform a particular code.
Does the memory used in declaring variables are reclaimed by the OS when these variables go out of scope?Does the memory used be released by setting thier value to nothing? if not, then how can I force the garbage collector to run or excecute at a certain/desired time..How about in Windows Forms..How can we make sure that the memory used in initializing and showing forms be released if those forms were closed?
View 13 RepliesQuestion 1: What is the difference between "Background Worker" and "Worker Pool" as indicated within the MSDN samples provided.
Question 2: I noticed while using, AddressOf _Function_, variables cannot be passed; what would be an efficient solution to this?
Question 3: While using multithreading is it required to invoke before setting variables, or only form properties?
Question 4: While using System.Net.Sockets is it safe/efficient to use Application.DoEvents while waiting for new data; or would be using a Do While loop be fine without DoEvents since the action would be multithreaded? Note: there can be up to 2000-3000 sockets in use at a time.
I'm new in .NET programming.I have a class Form1 that includes Button1_Click event.Button1_Click creates a multiple Text Boxies at run time)Here is the class:
Public Class Form1
Dim shiftDown As Integer
Dim counter As Integer
[code].....
I would like to run a code every 1 minute ,15 minute etc Is there any better way than following put in the timer control with time interval 1 sec. A c# solution is also ok.
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I have this datetimepicker in my application. The user can select the time they want. I used a custom one and this is the code I used:
Code:
TimeFrom_dtp.CustomFormat = "HH:mm"
TimeTo_dtp.CustomFormat = "HH:mm"
I also have an array; a combobox and a variable called: TimeInterval. here is the code I use:
Code:
Dim ReadingFrequency(7) As Double
Dim TimeInterval As Integer
Private Sub CustomizeGraph_frm_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
[code]....
What I want is to change how much the datetimepicker increments, when you click the arrows, depending on the value that is entered in the combobox. For example, if the user has 2 hours in the combobox, the datetimepicker will increment by two hours and won't let the user change the minutes. If the user selects 15 minutes, the minutes will increment by 15 on the datetimepicker.
What would be the best way to run a subroutine over and over again every X seconds. I want to avoid creating an infinite while loop to do this because this sub needs to be called repeatedly while the rest of the program is still active and responding.
View 4 Repliesi just want to know How to do this kind of problem[attachment=27546:problem.jpg]i just want to save the date intervallike i will select the Start Date and End Date
View 4 RepliesHow to make the timer interval less than 1 ms ? other wise i want to make the interval of the timer 0.001 or 0.05 at most.
View 13 RepliesI am using a timer which is controlled by user through a settings form the settings form have other settings which are saved well While the Interval is not saved well it will be set with a NumericUpDown through the following code
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So, I have two timers. 1 Timer is set with an interval of 1000 (milliseconds), therefore it goes off every 1 second. For some reason, when I set the interval on the same timer to 1, it goes off 100 times every second. Shouldn't it go off 1000 times every second? What's going on?
View 4 RepliesHow can I get a timer to run one interval,one interval only, and stop? Until now I have only used timers to keep running until I say to stop. Also I need a timer that will start at the beginning of, and run until any given process is completed.Upon completion it should shut off and tell me how long the process took. Kinda like a stop watch with a Stop / Start "Trigger".
View 19 RepliesWhat exactly is that time-out interval parameter when downloading a file using vb2010?
View 4 RepliesI was wondering how do I make it so that people that use my program can change the Timer Interval. So they can set the timer.
View 3 RepliesHow can i trigger my update panel to refresh after a certain period of time.
View 3 RepliesI have asp.net chart intervel issue. I am feed data to chart like below
X1 Y1 X2 Y2
100 907 500 2395
100 745 500 2343
100 760 500 2403
Each row is a series in the chart.
In am iterating each row in code and making new serie and adding to chart
series1.Points.AddXY(dt.Rows(i)(0).ToString, dt.Rows(i)(1).ToString)
series1.Points.AddXY(dt.Rows(i)(2).ToString, dt.Rows(i)(3).ToString)
Chart is coming like it is fine. Now I want make interval like 100,200,300,400, 500 (500 is max of the graph). I tried Chart1.ChartAreas(0).AxisX.Interval = 100, It did not worked out.
I am trying to get AxisX interval for MS Chart Control in code behind. But when i try to retrieve the value, it returns zero even though it has a default value.
'Doesn't return the correct value, only returns 0
Dim XInterval As Double = mainChart.ChartAreas(0).AxisX.Interval
[code]....
How can I change the interval of a timer to tics, or change the scale of movement from pixels to twips?
View 12 RepliesI need to check my field in format ddMMyyyy(ex 12/03/1990) whether in interval of two dates that user picks from two date picker controls. Two date pickers are in custom format dd/MM. It does not matter for me if its between particular years. I need just to know if given Birthday belongs to interval taken from screen. Each datepicker gives values dd/mm/yyyy. I do not know how to check it. For example: Given date 12/03/1990 . User select two values from screen: From 01/01/1950 Upto 30/04/1949(or 1990, or 2000) Result should be True.Because 12 march is between 01 Januar and 30 April.
View 1 RepliesI need to check my field in format ddMMyyyy(ex 12/03/1990) whether in interval of two dates that user picks from two date picker controls. Two date pickers are in custom format dd/MM. It does not matter for me if its between particular years. I need just to know if given Birthday belongs to interval taken from screen. Each datepicker gives
values dd/mm/yyyy. I do not know how to check it. For example:Given date 12/03/1990 . User select two values from screen: From 01/01/1950 Upto 30/04/1949(or 1990, or 2000) Result should be True.Because 12 march is between 01 Januar and 30 April.
I am trying to add functionality to automatically click the receive button if the Form1 is loaded.Even when i did not attach it to the timer the bCheckmail.PerformClick() did not work - Ideally this application will be loaded and check mail every 15 min.
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim Code As Integer
Dim Version As Integer
[code]....
I have an animation program which allows users to import and animate images. I do this using timer events. I have a listbox which contains the image references, and a Image which displays the chosen image. Here is the
When the user clicks the "Animate" button:
vb.net
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles animate.Click
Dim cananimate As Boolean = True
[Code].....
I want to make a dialog to appear and allow the user to select a custom FPS for the animation. For instance, if they type 15, the listbox must go down 15 images in 1 second. But how do I convert FPS to a timer interval?
i want to do this with the delay of in interval with the loop of 10 times.
for n=0 to 10
label.text="0"
time delay of 1 second
label1.text="1"
end loop
But when i m using executing the loop completes it iterations and timer just show work in last iteration.