Performance Counter Category Name Drop Down List Is Empty?
Jan 30, 2012
I wrote a VB 2010 app on a single core processor utilizing performance counters which runs fine. However the release exe fails on my quad core, trapped by the OS on its first access to a PerfCtr. I've loaded VB Express Studio into the quad core
and when running the app in Debug I get this error "Cannot load Counter Name data because an invalid index was read from the registry." Similarly, adding a counter to the app on the quad machine results in the empty drop-downs for category and it sub fields.
where I can get an update to these registry entries?
I have this code sample from a book I'm reading which looks to be incorrect:
Imports System.Diagnostics Sub Main Dim pc As New PerformanceCounter("PerfApp", "Clicks", False) 'excepiton here pc.Increment() counterLabel.Content = pc.NextValue().ToString() End Sub
There excepion message I get is: The requested Performance Counter is not a custom counter, it has to be initialized as ReadOnly. I looked for a property to see if I can set it but couldn't find one.
In the following block of code always returns zero for the CPU usage. However, if I run it through Visual Studio in debugging mode, do a "Quick watch" on the variable "pcCPUCounter", add ".NextValue()" at the top, and tell it to reevaluate, that returns the varying percentage (eg, 5%, 71%, 16%, etc etc) as the processor utilization fluctuates.
Why would the code always print out zero, but the quick watch doesn't?
Private Sub UpdateCPUUsage(ByVal strSelectedServer As String) 'Performance items come Performance Monitor: perfmon.msc. 'The right-click on columns at bottom and select "add counter" to see list.
I don't see why this doesn't work. I have gone into the registry and removed the registry key below and still no joy. The error arises at the For Each Loop.
I am trying to create a list box that can have things added and removed from it with the use of add and delete buttons in subroutines, i have also got a limit of 20 as the maximum number of items in the list box, also i would like the list box to be able to update the number of items in it after the user adds or deletes items from it: here is my code:
Public Class Form1 Private Sub cmdAddZp_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdAddZp.Click
[Code]....
the first part is for limiting the number the user can add to the list box, the second part is the delete function and the last part is trying to count the number of items in the list.
Does anyone know if it is possible to make a drop down list control (when clicked) list its contents above the item, rather than below? Effectively, I need a drop up list rather than a drop down list...
Is it possible to reorder the elements of a drop down list (combobox) via drag and drop?For example, when the list is dropped down, I want the user to be able to drag the items up or down to reorder them. I tried this (and some google searching) but I'm wondering if its just not possible:
Private Sub cmbClassLists_MouseDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles cmbClassLists.MouseDown If cmbClassLists.DroppedDown And Not cmbClassLists.SelectedIndex = -1 Then
I have a custom class Y which includes a public property X as list(of string) which won't always have data
In my code I am trying to do the following dim x as list(of string) = Y.X if not x.count=0 then do somthing
The problem is that when Y.X has never been set, it causes an error. What would the proper way to check for Y.X be? I haven't really worked with lists too much.
I am a newbie of using a vb.net. And I am eager to know everything around. I have a problem that seems hard to find for. I would like to retrieve data from database using drop down list, and select only the fields that i want to retrieve from it.
DesignationTable From my table i like to display only two in my drop down list
I am trying to compare a calculated date with a value in a dropdown list. The value is a date.toString.This is what I have so far:
Dim sched = scheduleDateVal.toString("d" If Holidays.Items.Contains(New ListItem(sched.ToString("d"))) Then ScheduleDate.Text = scheduleDateVal.AddDays(1).toString("d") End If
Holidays is a dropdown list bound to a database so that I can add a day to a scheduledate if it happens to fall on a holiday. This works if I add a string value to sched rather than converting scheduledateval to a string.
I'm creating a simulation programe. In one sheet I have a group of cells (AngleConf) that have a drop down list. I would like to make some operations when I change the value of one of these cells. It always works when I insert the new value manually. But it doesn't always works when I change it by selecting the value from the list. I supose that that happens because of some option that I change while I'm working but I can't find out witch one exactly.The code that I think that its implicated:
Sub Worksheet_Change(ByVal Target As Range) If InRange(Target, Range("AngleConf")) Then Call resistance 'Actualiser le r�sultat mecanique
Dim l as IList(Of Foo) = (From dataRow As DataRow In table.Select() Where CStr(dataRow("Column1")) = "A" Select New Foo(CStr(dataRow("Column1")), _ CStr(dataRow("Column2")))).ToList()
What's happening is that if i set a break-point to the constructor of Foo and step, the constructor is hit and the parameters are loaded with the arguments. However, l has empty Foo objects (the members in every object are Nothing). What could be happening here?
I'm trying to find a dropdown-style list for images I can use in a program of mine. It's fairly simple, just needs to display a few images in a grid with tooltips for each one, and I need to be able to get whichever one was last picked. For example,[URL] without the tab bar in it. Unfortunately my monetary budget is zero which means I can't purchase any controls?
This is turn populates my dropdownlist, when a user selects a value, it is then populated to the remaining textboxes on the remaining forms with a session call...
Through this session it populates the one value, is it possible to display the selected value but also include all other dropdownlist items in case they want to change thier selection?
I cannot get the value from the drop down list and I not sure what's wrong with the declaration and the code.
Dim selectedIntake As String = intakeDropDownList.SelectedItem.Text() Dim selectedSupervisor As String = supervisorDropDownList.SelectedItem.Text() .supervisor_ID = selectedSupervisor(0), _
[Code]....
This is the error message I get :
The INSERT statement conflicted with the FOREIGN KEY constraint "FK_student_Details_lecturer_Details". The conflict occurred in database "SKTM-AAS", table "dbo.lecturer_Details", column 'supervisor_ID'. The statement has been terminated.
i have four price values in a drop down list and i need to code these values and add them to values from a checklist object i am doing very simple coding ?
Is using Public Property the best way to achieve the following.From a drop down combobox, a list of options are available. Each option in the combobox has a number of public properties that need to be associated with it.When a option is selected, the user will then have two buttons that each call a different sub, the appropriate options are passed to the sub.Each option will always have the same properties required to be passed.So I'm looking at something like this.
Public Class Parameters Public Property server As String Public Property replica As String Public Propery path As String End Class
i have two pages.1.aspx and 2.aspx i have a drop down list on the first page and a back and sumbit button on the second page..If i make a selection in the drop down list and go the second page and then go the the first page again with the back button. the drop down list doesnt show the selection that i did.i tried the use "sessions" but didnt work, also tried postback but no luck. I read something about "Enableviewstate" also no luck.[code]
I have created a drop-down list box that holds 8 numbers representing a month span (3, 6, 9, 12, 15, 18, 21, 25 months). In order to prevent users from typing just anything into the text box above the combo box, I changed it to a drop-down listbox. The other requirement that I was hoping to implement was for the user to be able to type a number, after which the selection would jump to the appropriate item (i.e. the user types in '1', and the selection jumps to 12). This partially works. It will jump to 12, for example, but immediately after the user types the '1', the Selected Index event changes. The user cannot scroll down or up after typing in a number.
the following code allows me to drag and drop the data, so i can reorder the list box. However, is there are way of seeing the line across the list box where it will be moved to?
I have multiple drop down lists on a page. They all contain list of countries. So in the background I am getting countries from database and caching them. I would like to populate those drop down lists from another thread. I am also using AJAX controls so I wanted that it all happens at the same time. And also after a user selects a country I want that towns from that country show to the user, and I want that getting towns happens also in another thread so that user can fill other controls while the list is not yet loaded.
I have read somewhere that I should give Page as a parameter to that thread and then find that drop down lists and populate them. But that is not working.
Here is a function that is called when another thread starts:
protected void GetCountries(object o) { if (Session["Countries"] == null) {
