I have an event which handles multiple controls. How can I tell which control caused the event? [code] I want to run validation on each control, (combo and textboxes) and if it succeeds, enable a button. I could do this for every control individually but I want to know if I can use the sender value to determine which control needs to be validated.
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it is clear that an Object handling an event has to unregister himself of that event before it ends, to avoid not been cleared from the memory by the CG - especially when it lives longer than the "Event Raiser" object. But, on the other hand, I wonder if it is possible to encounter this problem on the web server... Is it possible that the server will keep this object alive, even if the execution context (i.e. the web session) has died? Are'nt all the objects related to a session cleared with the session itself?
View 1 RepliesIn my windows application, I want to check which part of code (or routine) has caused un-handled exception event to occur from application events in its running mode (not debugging).
If this is possible then please guide me how to do this.
If any clarification regarding this is required,
I've read thru Iceplug's tutorial on control arrays and got it working. I tried to add a new event by basically copying his click event code and calling it a doubleclick event. I used the proper addhandler and assigned the correct name to my sub. I have the click event changing the background color to blue and the doubleclick event changing the background color to green. The background color does not change to green. Why?
Heres the tutorial with my new code encased in asterisks ...
Code:
Imports System
Imports System.Windows.Forms
Public Class form1
[CODE]...
How should I go about getting my mouse position over multiple controls, and such. I can't use the form_mouse move event, or any other control event nor can I use them all at the same time cause that would conflict with the actual position I need for an object.
View 10 Repliesi'm using Enumerable.Except to check if a DataTable in memory is in sync with the table in database.
The background is: this DataTable and other frequently used tables are stored in the Cache of a WebApplication. But meanwhile i'm convinced that this is not a good approach because it's a source for nasty errors that are difficult to reproduce/debug.
Therefore i've created a function that checks if database and memory are in sync, otherwise an error-log will be created. This works perfectly. If there is a row in memory that is not in database, this row will be shown below "Difference in database", the same applies in reverse. But if rows exist in both datasources(the PK idRMA) and some values differ, the log will contain this row in two versions(below "Difference in database" and "Difference in database"). It is not easy to see the differences on the first sight.
Q: Is it possible to select only the properties that caused Except to think that first sequence is not in second?
This is the the complete function(the first lines are relevant):
Public Shared Sub CheckRmaMemoryInSyncWithDB()
Dim inSyncText As String
Dim color As Drawing.Color
[Code]......
I'm trying to do a little remake of the old game Achtung! Die Kurve, which is a snake-like game, but with multiple players trying to corner eachother until one remains. Don't play it, it's way to addictive, thats why I'm doing the remake now, I want to play it with up to 8 players instead of 6.
Now here's the problem: to draw the snake, I just use the GDI+ and make it draw a 3x3 rectangle on the form background. It works fine, until you resize or minimize/maximize or something like that, which causes a complete repaint of the form. This is not a problem... but when I press ALT or TAB, the form repaints.
And even stranger: it only happens the first time I hit each button. I can make it happen twice by hitting ALT and then TAB or vice versa, after that, nothing. I really don't get it, and its driving me crazy. I dont want a game with a splash screen saying 'First hit alt, then tab to start the game. Not at the same time that makes you leave the game.'
I have a situation where I need to ignore parts of page load sub inside a isPostback = true. Basically inside the isPostBack I want something like if button1 caused postback.... do this else do this...
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
If IsPostBack = True Then
If TextBox1.Text <> String.Empty Then[code].....
I have 2 button controls. When I click one i'm trying to determine which one caused a postback in the page load.How to do determine this?
View 3 RepliesI am trying to develop a web application to populate data to three datagrids(datagrid control) using 2003 version, each datagrid has three columns and about 10,000 rows. The problem I got is it only allow load data once, whenever I changed the setting and reloaded data, the Page Can Not Be Displayed error will popout. I tried to remove one or two datagrids, it would allow popu
View 2 RepliesI opened up a project from a while ago (an app we use daily) to implement FileSystemWatcher. I thought I did my homework but apparently not.As it was, a button fired off a sub to do some work. Instead of the button firing it off I wanted a file change to fire it off. Only after implementing FileSystemWatcher, now nothing in my app works. Just about everything I try to perform is met with this error:
"Cross-thread operation not valid: Control 'TabControl' accessed from a thread other than the thread it was created on." (TabControl being from purecomponents)My best guess is, when I create the watchers I'm throwing my app into some sort of background thread? Is there a better way to start the watchers? Or do I have to now change all existing code with invokes? I get a little lost at that point.
Here's are the only changes I made to my app:
Public TabFilesToWatch As List(Of FileSystemWatcher) = New List(Of FileSystemWatcher)
Sub form load:
WatchTabs()
Private Sub WatchTabs()
For Each Tabs As TabStructure In TabsArray
[Code]...
We have some code in the textCahanged event of a textbox. We only want to fire that code if the user types into the box, not if we change the text in the box programmatically. Can I detect what caused the text to change?
View 12 RepliesI've created my own ascx control with button inside it. Now I'm using this control inside other control. (In my case it is a webpart). What I would like to do is program button.click logic from my custom control inside webpart
View 4 RepliesThe code is listed below which hopefully illustrates what I'm trying to do:[code]....
View 12 Repliesi want to know what are the methods in order for me to extract the information that is stored in the exception. i also would like to know how do i extract the code line that caused the exception to occur.
View 6 RepliesI recently installed Visual Studio 2010 which caused the same error, every time i try to start the program i get this message. i am using windows 7 professional 64bit i only have one user account, and i am the computer administartor. every other program works fine but visual studio programs.
View 2 RepliesHow do capture which button caused the postback on a web form with multiple controls using asp.net
View 3 Replieshow do I handle the errors that may appear from the user of my program. For example, I have an triangle area program in wich I ask the user of the program to insert the length of the base and height of the triangle in a textbox. But what if he inserts a letter or something else, like a sign....my program will crash...
I know that one method would be to use On Error GoTo but I don't know how. If maybe you can direct me to some link or you could explain how do I handle errors, I would be grateful. Maybe you can even show me other ways to avoid errors from the user input.
This is my small program so far:
Private Sub Button1_Click(ByVal sender As Object, ByVal e As EventArgs)
Handles Button1.Click
Dim , Height, ARIA As Integer
[Code]....
I've got a small app which I use to start a 3rd party application. When run from a shortcut the VB app starts the 3rd party app to and when loaded it displays its own file/folder interface, the VB app the closes itself. However, if you open a file in explorer associated with the 3rd party app, the 3rd party application loads and opens the file itself and not the file/open interface.
Uh OK, so what's the problem??The issue is I have changed the file extension associated with the 3rd party app to now use my VB app. I can successfully open files with the app from explorer if there are no spaces in the file or folder path however if there are, the 3rd party app opens and displays a File not found error message and gives the path up to the point where the space then follows.The relevant snippets of code from the app relating to the issue is below, specifically Dim Arguments variable where I am not quite sure how my string cocantenation should be to deal with the value of the variable 'Filename' which may or may not contain spaces.
[code]...
I am writing below code for validating compulsary field account no. in form.User's requirement is set focus back on field when error comes :
If txtAccountNo = "" Then
MessageBox.Show("Account no filed can't be left empty")
txtAccountNo.SetFocus
Exit Sub
End If
It's working properly. But suppose user don't want to fill form and exiting from application.Message box keep on appearing till user enters account no.
ok so i have a PANEL control under a WINDOWS MEDIA PLAYER control. Both are same size.
The panel has a click event which shows a message saying "HI"
when the panel is behind the wmp control the message is not shown when i click on it.
so the question is is there a way round it, cos currently it only works if the panel is on top of the wmp control
how can i call a VB function - deleteevent() in usercontrol.ascx.vb from a javascript function in clickhandler(e) in usercontrol.ascx. The call should cause a postback because I need the usercontrol to display the changes.I am currently trying to do it by using a linkbutton with style display:none, and calling its click event from the javascript function. But i dunno how to call the click event.
View 2 RepliesIs there a way to show the line number of the line of code that caused an exception within a Try...Catch block?
View 5 RepliesI'm deserializing an object and in certain cases it works fine, however in others it fails. The exception is essentially meaningless to me, but there has to be a way to figure out where exactly it failed so i redirect my debugging.
[Code]...
I am trying to do something like:I have a cicle (For Each) which goes trough some items (existing N items)So, for each item read i have to create a control (a Label in this case) which must have the Click, MouseEnter and MouseLeave events . Each event will use/edit properties of the created control Creating those labels is easy but adding the event handler to the control i have no clue how to do it ... Believe me when I say I've spent a lot of time thinking about this .
View 3 Replieswhich control have no event in.net
View 2 RepliesI have a menu item in a program that I'm working on called "mnuFileSave" The Click event goes through several "housekeeping" functions and calls the correct "Save" function.
Another menu item performs a function and depending on the results may want to call the "mnuFileSave".
I have tried RaiseEvents mnuFileSave.Click and get the error "mnuFileSave' is not an event of 'The_Entertainment_Collection.frmCollectionBook'
I have tried Call mnuFileSave.Click an get the error "Public Event Click(sender As Object, e As System.EventArgs)' is an event, and cannot be called directly. Use a 'RaiseEvent' statement to raise an event."
i already finish this module but while doing 2nd module i notice that my 1st module doesnt work anymore, then i checked my code, i double click the control at design time and thats it instead it brings me to my actual code of that control, it brings me to another event, like this, this is where my original codes are placed:
Code: Private Sub lblSupplier_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)
End Sub then, after the poblem occurs, the control created another event like this:
Code:Private Sub lblSupplier_Click_1(ByVal sender As System.Object, ByVal e As System.EventArgs)
End Sub notice the difference, they are the same click event but the other one has an "_1" at the end of click.
I'm looking to create a custom date picker with code examples from several sources.
Is the code to display/hide an ASP.NET control when a user clicks a button usually done with JavaScript or ASP.NET code? By display/hide, I mean within the page not a popup window.
[code]how to detect if what button did i clicked? i just want to disable the button i clicked or change it properties..
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