Single Form With Multiple Instances

Aug 12, 2010

I have a form which displays temperature and humidity data for a device in the field. I have multiple devices. Rather than creating a separate form for each device, obviously it is much better to have a single form that I instantiate, pass data to, and display. The devices are listed in a treeview, and when the user double-clicks the node, I create an instance of the form, pass the device's data to the instance of the form, and display the form. All of this works perfectly. However, I have a challenge: If the form for a particular device is already open, I don't want another one opened when the user double-clicks the node.

However, whenever I place logic in the program to check for the existence of the form and only allow another instance to be created if one doesn't already exist, it prevents me from creating a form instance for any other device that I may wish to view, simultaneously. So, I have a dilemma -- allow the user to display the data for multiple devices, including allowing multiple forms to be open for a single device, OR only allowing one device to be displayed at any given time.



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Apr 6, 2012

I've got two sets of lists with nearly 800 items that I need in 32 different drop down comboboxes (before you ask, that is required and it can't be simplified). Understandably, populating each of them slows down the creation of the form. This happens to be a child form that these drop downs are on and there could be more than one child form displayed. I've assembled the lists in List(Of String) objects and set each of the datasources of the comboboxes appropriately, but it still takes several seconds for them to populate and display for the first time. This is also problematic if the datasource gets updated (items removed, added, renamed) because I have to wipe out all the items and create the list again in all active instances.

[Code]...

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If I create a console application for example with a class named "Person" I can create an object variable with a ceratin name only once. For example:

Module
Module1
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[Code]....

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Mar 3, 2010

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Jul 6, 2009

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Apr 6, 2010

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[Code]...

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Aug 23, 2010

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Sep 16, 2009

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May 7, 2010

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[Code]...

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for each killfrm as form in my.application.openforms
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[code].....

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Private videoShow (byval videoName, byval videoIp)
dim videoForm as new form
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[code]......

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Sep 8, 2011

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tsslStatus1.Text = sender.ToString
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Jan 28, 2009

After making the changes or adding a record I use invoke childmethod from my toolbar to call these subs. The first table updates and adds, but the second does not. I have set all of my textboxes databindings and double checked them. I get no error, but it does not update the second table. What am I doing wrong?

Public Sub AddRecord()
'Clear out the input data fields on a new Add.
ClearInputFields()

[code].....

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Dec 13, 2011

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Just like here: Date:18-12-2011, Requirement No.001/11-12, Mines No.OP-128, In Charge Name: Karsanji Plot=0,Satta=0,Dump=6, Transporter:Ghanshyam Roadlines Destination:Madhapar Here Some Button to generate/modify records: Add,Edit,Save,Delete,Previous,Next,etc If I distribute 15 trucks for Ghanshyam Roadlines to move carting from OP-128 to Madhapar then I will have to entry 15 times into Windows Form of ERP System for creation loading slips numbers from 1 to 15. Here all my data to input 15 times into ERP is same, so why is it not possible to create multiple reports with single entry form?

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Is Running Multiple Threads Faster Then A Single Thread On A Single Core Cpu

Dec 23, 2009

Say I have a code with 3 methods that do some pretty intensive work. Would executing these methods on 3 seperate threads be faster then executing them one after the other on a single core cpu? And what if it's a dual core or HT?

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Jan 3, 2011

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Dim 2000Connection = New SqlConnection("Data Source=" & SQLServerName & _
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Dim 2005Connection = New SqlConnection("Data Source=" & SQLServerName & _
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Dim 2008Connection = New SqlConnection("Data Source=" & SQLServerName & _
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[Code] .....

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Mar 29, 2010

I have the following problem. (VB.Net 2008)I have created a class (myFirstClass). In this class there are a lot of calculations being made wich gets fired by events in that same class.Now i want that same class to be able to fire more instances of itself. However i noticed that each time i fire an event from a Sub the program waits till the event is finished before going to the next line of code. This is a problem since i want the event wich fires a new instance of the class to fire it and forget about it.

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VS 2008 X86, X64, PID, Multiple Instances?

Feb 6, 2010

My ultimate goal is to get a list of PIDs and have a user select 1 of them.For example: the process image name is program.exe. The application name varies for each instance the program.exe is run, and therefor each application name has its own PID associated with it. By application name I mean the Task name under the Applications tab of Windows Task Manager. Another issue I face is that some systems run x64, so the name is no longer program.exe but program.exe*32

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Jan 14, 2011

I have a control which consists of a couple of labels and a couple of buttons side by side.I want to add multiple instances of this control to a panel.The problem I have is with positioning/formatting.Whenever I add the control it just gets added on top of the previous one.Should I be using something other then a panel? Are there any tips ot tricks I should be aware of ?

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Aug 30, 2010

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Mar 9, 2009

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Jul 20, 2010

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Code:
Dim SetAlarms(7, 9) As String
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[Code]....

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Sep 22, 2010

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Feb 15, 2009

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dim objFixture as new clsFixture
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May 19, 2011

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[Code]...

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Jun 22, 2009

Good Day. Kinda banging my head against the wall on this one. I have a Mdi application with the start form(mdiparent) and form1(mdichild). On the start form, there is a textbox and a button. Heres how I want it to work:

1. value is entered into textbox and button is clicked

2. if form1 is open with that value, Bring it to the front if not, create a new instance of form1

If Not IsNothing(frmForm) Then 'If it is something
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[code]....

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Mar 23, 2011

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Mar 20, 2010

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Aug 15, 2011

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[Code]...

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Code:
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[Code] .....

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[Code]...

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Jun 3, 2010

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[code]....

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