How To Ensure No Duplicates
Feb 20, 2010
I have a problem with ensuring no duplicates. I have an Appointments form (frmAppointments) and within it exits 4 date time pickers. The first 2 date time pickers are dedicated to creating an appointment date whilst the other 2 are for the purpose of changing an existing appointment date. When the date and time is entered into either one of the pairs (of date time pickers), the values inside get transferred to 2 corresponding textboxes. The user then clicks Save (btnSave) and the values are saved to sql.
How can I ensure no duplicates (of the date and time) can be created?
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Jun 11, 2011
Say if you had two private subs on a form, how do you ensure the first sub called has completed it task before the second is run.
[Code]...
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May 20, 2009
I am having a small 'head banging' experience working on one of our DLL products.The problem I am having is that this application is an outlook addin, and as such, does not own its own Message Pump. No problems there, I have a UI class, which starts a thread, and calls Application.Run(new fControlForm)
I use the Application.Run passing a form, rather than an ApplicationContext purely because I want this form to be in charge of displaying other forms: ie, I can use BeginInvoke to ensure that a second, and many more forms are created in the context of the thread that owns the Message Pump.
I however feel this to be quite hackish. I get a form displayed at startup (which I am sure I can hide if I needed to)My question: IS there any way to create some form of Invoke procedure in an applicationContext that uses the Message Pump thread? I have created a class which implements the ISynchronizeInvoke and can Invoke from a thread that it owns, however this is not the same as invoking from the Message Pump owner.
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Jul 11, 2010
How can I ensure that a user enters data in one text box before being allowed to move on to the next text box Example I have four text boxes the user can enter a grade in. I want to lock the other three box until the user has entered a number in text box 1. Once a valid number has been entered in text box 1, that releases or enables text box 2. Once a valid number has been entered in text box 2, that releases or enables text box 3. And once a valid number is entered in text box 3, that releases or enables text box 4.
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Feb 3, 2011
So when that code run the program don't switch.Say I want to
Open a file
Write something
Close a file
Way when I open a file, another thread want to open that same file. That means open a file get executed twice.
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Sep 30, 2011
I have a screencasting program where it takes 10 screenshots every second and saves it to a temporary directory then through ffmpeg the series of images are compiled into a video format. My problem is that due to the computers processing power or the size of each screenshot and its quality it sometimes takes longer than 100 Milliseconds to create one causing the whole video to be off balance. How can I ensure 100% that 10 Images will be stored?
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Sep 2, 2010
I've created some classes that will be used to provide data to stored procedures in my database. The varchar parameters in the stored procs have length specifications (e.g. varchar(6) and I'd like to validate the length of all string properties before passing them on to the stored procedures.
Is there a simple, declarative way to do this?
I have two conceptual ideas so far:
Attributes
public class MyDataClass
{
[MaxStringLength = 50]
[Code]....
This seems like a lot of work and will really make my currently-simple classes look pretty ugly, but I suppose it will get the job done. It will also take a lot of copying and pasting to get this right.
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Feb 10, 2010
I have a WCF service being hosted in a Windows Service (using techniques discussed here) and it works great. I'm now writing a (VB.Net) frontend app that needs to call that service, but I don't want my users having to fiddle around with the services snap-in and starting the service manually. Can I write some code to ensure the Windows Service is started, or start it if it isn't?
Edit: OF course, I can ensure the Service startup is set to automatic, but it doesn't need to be running all the time, and even then the frontend app still needs to be sure the service is running and start it if it isn't.
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Sep 8, 2009
I need to make sure that the connection to a POS printer is successful before writing data to the database and then printing a receipt. The POSprinter is normally of type BTP 2002NP but may differ. The common thing is that they are all connected via COM-port and NOT usb, so no drivers installed at all on the client. Can I send some kind of "ping" on a COM-port and check if a device is connected and turned on? Additional information, the application is developed in VB.net and Visual Studio 2008
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Sep 5, 2008
how to ensure that a process created via the diagnostics.process class goes away when my app does. My app starts two processes, one runs plink and one runs psftp. Due to reasons that I don't want to become the focus of this post it is possible that my app will shutdown in an ungraceful manner. When this happens the psftp process dissapears but the plink process remains left behind. See the code below for how I am creating these processes.
Code:
Public Sub New()
Try
p = New Diagnostics.Process
'p.StartInfo.FileName() = "plink"
[code]....
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Oct 6, 2011
Please take a look at the code below. I was told by the individual that developed itoriginally that the code only adds the rows of data the user entered. In other words,there 5 rows of textboxes. user can enter data into one row or into all 5 rows. If the user enters data into one row of textbox, that's what gets inserted into the db.I made some minor change to the code so that users can tell when a payment is made by check or cash payment.Since I made that change, whether a user enters data into one row or all 5 rows, all 5 rows get inserted into the db.How can I modify this code to ensure only rows entered get inserted?
For x = 1 To 5 Step 1
dedval = obr.FindControl("ded" & CStr(x))
chckvalflag = obr.FindControl("chck" & CStr(x))
[code].....
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Mar 10, 2011
I have the following code which is part of a PA Call system: The 'SetPTT' nd 'DisableZones' statements set controls on the form where the code is. The LAPG2Coms.SetZones command starts another project within the solution to control an external controller. What I can't understand is why it executes the LAPG2 statement before SetPTT or DisableZones. The LAPG2 statement for messages is in the PlayMessage Procedure
[Code]...
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Nov 25, 2011
I need to ensure that the user can only click the button (to acknowledge the message) and not do anything else (like clicking another button). How can I do that?
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May 8, 2011
I'm trying to find out how to ensure a font is found by a project.I would expect to be able to add it (Them) to the recourses but can't find how to do that.When I get to 'Add item' I've tried 'New' and 'Existing' but can't find a template for fonts, so I'm lost (again).
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Mar 6, 2012
I have a listbox that is sorted and the data table that is bound to it is also sorted. I am trying to add a Record to this data table and ensure that it is always at the end of the list. Is there a way to do this using specific character combination?
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May 7, 2009
I need to ensure 2 calls are enlisted in a transaction
[Code]...
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Sep 24, 2009
I've written a small program that monitors the customer field in Quickbooks and query's a database to determine if there are any important notes for the selected customer. This works fine however, I either need the messagebox or a form to come to the front of all open windows on the system to inform the user that the selected customer needs to be reviewed.
How can I ensure that a form (or messages box) that opens in my program comes to the front of any and all application windows that are open?
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May 6, 2012
How can I ensure my app fully compatible with x64 Win7 platform? I have a choice of 32 or 64 bit development machines to use.
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Mar 7, 2011
I have an application that opens a Excel file into a form using AxWebBrowser.Navigate. This works fine unless there is another Excel file open before I run the application, in which both excel files are opened in the same Excel application which then causes problems.
How can I ensure the AxWebBrowser.Navigate opens a New Excel application?
Imports Microsoft.Office.Interop.Excel
Imports Microsoft.Office.Interop.Owc11
Imports System.Runtime.InteropServices
[Code]....
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Sep 7, 2011
I have an application that gathers information from a user into a Win.Form and then uses the Process.Start() to start Notepad and then using Sendkeys write the Notepad document.Sometimes this works great and sometimes the Notepad window is not started as the foreground process and the document is not written.What is the best way to ensure that the window opened by Process.Start("Notepad.exe") is the active window for the duration of the Process?
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Oct 17, 2010
How can we ensure that an NUD has a value DISPLAYED if the user deletes its contents?
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Feb 14, 2012
I have a MultiThreading issue and conceptual question using Visual Basic (but it applies to almost all languages). [code]...
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Apr 17, 2010
I have a form (formA) which contains a tabcontrol with two tab pages. Each tabpage has 6 textboxes and 3 comboboxes. In addition to the tabcontrol there is a separate combobox and textbox. The question I have, is how to best ensure that all these fields are populated with text and or numbers? From this a start button is pressed which generates another form (formB) which requires the fields from (formA). If for instance 1 or more fields is not populated, then generate a message to show the user which 'box' requires data. Only when all fields are populated will this enable the 'start' button.
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Jan 4, 2011
I have a form with a drop down combo box and a list view. The user selects a date from the combo box and then they are to select an item from the list view. I want to ensure that the user has selected a date from the combo box before processing the information from the selection in the list view.
If cboYEARMONTH.SelectedItem = Nothing Then MessageBox.Show("Please Select a Year Month")
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Sep 10, 2010
how to ensure that a form stays on-screen completely and cannot be dragged outside the bounds of the window.
This is because the user needs to be able to completely see the form without any of it being cut off.
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Jan 21, 2012
It's easy to do so in objective c but I do not know how to do so in vb.net update:I know about control.invoke. But control.invoke requires a control that may change from program to program. What would be the easier way?So yes program is winform. However I need a solution that does not depend on any specific control. If that's the case actually I do not need things to be run on main thread do I?
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May 18, 2010
I have a windows application that displays a multi-line message box to the user during the course of the program.This particular application is run on various machines running either XP, Vista, or Windows 7.When the application is run on an XP box, the formatting of the Messagebox looks great. When the program is run on a Vista or Windows 7 machine, the text in the messagebox is eschew and the formatting looks sloppy.Is there a way in Visual Studio to ensure the formatting of text in Messageboxes is consistant between XP and Vista/Win 7?
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Jan 24, 2010
1.Ihave to produce an application that enables the user to enter an integer rate of pay and an integer nr. of hours. On clicking a button the application should display rhe pay due. Amend the application:rate of pay to be entered as a real number;Employees are taxed at emergency rate of 40%. Amend to display GrossPay and NetPay.
2.Ensure that the operator cannot accidentally enter data in output areas!!!
The application is to be amended so thet the employees are paid overtime at time and a half for working more than 8 hours in any one session and all data enter by user should be checked to ensure that it is in a valid format and that the values are acceptable. [code]
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Feb 26, 2009
How can I ensure that the currently selected row ID in Parent Table automatically appears in my child form when I create a new row in the Child Form.I am using VB 2008 Express I have a Stored Procedure for the chiled table called "Files" can I do it from there:-
ALTER PROCEDURE dbo.CreateFile
(
@FileName varchar(50),
@DateCreated varchar(50),
[code]....
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Jun 2, 2009
what's the simplest way to ensure the installation of my app is installed in the startup folder/quick launch for all users , even if my app is not installed from the owner directory?
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