Check Box Events : CheckedChanged And CheckStateChanged?
Sep 25, 2010
I can't understand one thing : whenever I write the code for the Changed event of a check box , I simply double click on it and add the lines I wish. However,sometimes the event that is created is the CheckedChanged while for others , the CheckStateChanged .Moreover , the 1st ByVal variable is different :
Quote:
Private Sub MyCheckBoxAAA_CheckStateChanged(ByVal eventSender As System.Object, ByVal eventArgs As System.EventArgs) Handles MyCheckBoxAAA.CheckStateChanged[code]......
Why is this happening ? Also , some times , the sender is not declared as System.Object but as Object .The only thing I have mentioned is that the first seems to happen on lonely controls while the second seems to happen on controls that are part of a control array
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May 2, 2009
I've got a series of textboxes that are bound to a dataset. I've got them disabled and will be hiding them. Then I have a series of check boxes related to each textbox. The user clicks the check box and I change the value of the databound textbox. Nice and easy way to bind check boxes to DB fields. Any way to create these relationships at runtime - basically creating the events that I'm hardcoding right here.
Private Sub IntprtLead_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) _
Handles IntprtLead.TextChanged _
, IntprtCheck.TextChanged _
, IntprtCons.TextChanged _
, IntprtSimul.TextChanged
Dim strValue As String = TryCast(sender, TextBox).Text
[Code] .....
I know I can loop through the controls on the form and find these "named" objects easily enough. Is it possible to have more "generic" event code and then create the handles relationships at runtime?
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Mar 27, 2010
I want my panels to be visible when the radio button is check and when its unchecked it would hide.
Setup:
5 panels
5 radio button
radio button1 shows panel1 if checked Each radio button is set to show each panel and hide each one if its checked or not. Ex:
Private Sub RadioButton1_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles RadioButton1.CheckedChanged
If RadioButton1.Checked = True Then
Panel1.Visible = True
[code].....
When my form loads it shows panel1 because radiobutton one is check. But when i select another radio button panel one doesnt hide. Also when i did it to the other panels such as 2,3,4,5 it does hide and show when the checked state has changed.
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Oct 27, 2009
I would like MyProcess() to fire when I click on any of several checkboxes. I could do it like this. [code]I have alot of checkboxes, and anyway, this method isn't very scalable.Is there any other way for a form (or panel maybe) to detect mouse events on child controls kind of like the way the KeyPreview property of a form allows it to detect key events of it's child controls?
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Mar 9, 2010
with vb.net exp08 + access03
i want to check if the user not triggering any events in the application for => 30 min then i want the application to log off
how to do it ?
i am using two timers for the purpose to elapse the time but it is hard to call the function for every control + event
hence i am looking for a universal code which detects any kind of event and activate / deavtivate my timers
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Oct 13, 2009
I have a series of radio buttons in a Group Box on my main form. When I run the program, the first step is Sub New and the InitializeComponent() procedure.
It then immediately goes to the first radio button CheckedChanged event. This even currently contains some programming to access information from a database table. However, the program hasn't even gone through the process of opening the database and logging in. This doesn't happen until after my frmMain.Load event. However, this happens after the CheckedChanged event for some reason. So now that I have included the data requirement, I am getting errors because the reader is opening before the connection opens. I know I can set up a Try....Catch....End Try to avoid a user error, but ...I thought the form would have to load before anything about the controls happens and then since I haven't clicked anything, I am not sure why the event is triggering.
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Jan 19, 2010
I added: import microsoft.office.interop.excel and I suddenly got this error:" 'checkedchanged'is not an event of 'microsoft.office.interop.excel.checkbox'"
for each cb2 as checkbox in thechecks
addhandler cb2.checkedchanged,addressof checkpress
next
it erroreed on the cb2.checkedchanged part and this code has worked before. however once I add the import it errors. what namespace am I supposed to put it under?
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Oct 13, 2011
I have been trying to implement the jQuery weekcalendar using .net. What I can't seem to figure out is why weekcalendar states events.events is undefined after I make an ajax call to a webmethod I created which returns JSON. Below is the relevant code:
[Code]...
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Aug 2, 2009
I want to make Keybord events and mouse events for learning and educational Purpose.
1. In Form any object like A "picture box" move by Arrow keys .
2. Picture Box Contain many Picture i want change Picture With next and Previos By Arrow keys.
3. I contain Voice of alphabet in Mp3.When i Press any button in textbox then its work.
4. Mouse Pointer Change My Own.
5. I click any Object or any thing By mouse its noice clicking sound like Tik Tik Tik.... Question No 3 is very hard to do . but not im possible
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Dec 31, 2010
I created a control that has picture box control docked within it. This control allows me to "animate" the image by swapping them out by setting the interval to swap them at. I want to use this control kind of like an animated icon within a application, but because the picture box is docked, the control I created won't respond to the events, MouseHover specifically. [Code]
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Aug 5, 2011
I don't know how to use these events and get the appropriate values out of these events ....here is some code that I have copied from a website...
[code]
Private Function MouseHookProc(ByVal nCode As Integer, ByVal wParam As Integer, ByRef lParam As MSLLHOOKSTRUCT) As Integer
Try
If nCode >= 0 Then
Select Case wParam
[code]....
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May 10, 2011
This is my problem.I have a field set up in MS Access to Boolean YES/NO, this field is populated when the user check a checkbox on a windows form. If the user check a checkbox, the value is written as checked in the data field (MS Access).The problem is when I search for the user information, I need the information from the Data base to populate(return) to the windows form. Example: If I enter a users phone number and the user data is present, the form gets populated with the information the user previously entered which was store in the database.Example: If the user selected checkbox1 and submits the form. When I search for the user info, the check box should check(populate) because the user had checked it on submit.Here is what I have done:
[code]...
I am getting the check value correctly in the database using a Boolean.Here is one of the errors I am getting. Unable to cast object of type
'System.Boolean' to type 'System.Windows.Forms.CheckBox.I am having trouble putting the codes in a code tag or block
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Dec 15, 2011
My application is like this : i have to search my data from database with some check box and text box when user select check box specific function go on and then when user enters some range of value in textbox then the result will shown in data grid view after that i can print it by selecting data
my vb.net code is as follow:
Imports System.Data
Imports System.Data.SqlClient
Public Class XtraForm1
[CODE]............
I m also pasting the demo picture.
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Apr 9, 2010
Details: I want to compare these above two table1 and 2 . The unmatched records should be save in a new table .
objectives
1 Should take input the table and fields we want to match each other.
2 Then after searching or reading the record from table and selected fields save the unmatch records in a new table
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Dec 16, 2009
is there a difference between shared events and non-shared events?
Private Shared Event EVENT_something_changed()
Private Sub SUB_handles_something_changed() Handles Me.EVENT_something_changed
End Sub
no errors with this code, but how is Me possible since the Event is shared. it seems like there's no errors between switching shared with un-shared and switching Me with Myclass, all 4 combinations seem to work, isn't that weird
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Oct 8, 2009
hi there,first of i know nothing at all and my goal is to make a app for xp to check a database and check/patch a iso and then to burn the result to dvd-dl, basically like a app called abgx360 checks the database then like xbox backup creator burns the game, i'd like to make a app to do both, i'm going to college next year in september to learn programing c+ andf a few other things, but thats a longtime away.
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Jan 17, 2010
Is there a way to check specific pixels in a picturebox to check the color? Basically what I have is a black square with some white dots, and I want to find the position's in the picture of the white dots.
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May 9, 2011
I have a Boolean that writes to a data field. The data field(column) is set to YES/NO, if the user check a checkbox, the value is written as check in the data field.The problem is when I search for the user information, I need to get to form to the state it was in when the user submitted it.
Example: If the use select checkbox1 and submits the form. When I search the form, I need to make that particular check box check.
[Code]...
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Oct 23, 2008
I use check boxes and place them on my user interface (See attachment)I have coded the code for "select all" button :
Code:
Private Sub checkedall_Click(ByVal sender As System.Object, ByVal e As_
System.EventArgs) Handles checkedall.Click
Dim chkboxes, outs As New Collection()
[code]....
I could not seems to check all the boxes. Is there something wrong with it? I am not sure how to assign array to check boxes.
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Jul 11, 2011
A couple of questions about check list boxes:
How to check/decheck all the item in the list How do you copy or delete all checked items in the list
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Jun 4, 2011
How to check a check box based on a condition at run time?
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Mar 6, 2010
How can i allow the user to only check one check box on a CheckedListBox1..I was thinking of using a timer but that might be a stupid thing to do.
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Aug 1, 2011
spell check class? How to use it to spell check textboxes in real time?
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Mar 11, 2010
Is there any code that will make possible check if the user typed a word i want in order to show him something ? something like , if the user types time , or tim or timing or the word time and transformated to show him up the time ..
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Mar 1, 2011
I'd like to be able to access the events in a C# DLL so I can display a Progress Bar as the file analysis is carried out - the DLL is written by a third party using VB.Net.
Details
C# FileAnaysis.DLL
Contains a public class FileManager which contains 2 public subs
public void ProgAnalysis(string fileName)
public void ProgAnalysis(string fileName, ProgressChangedEventHandler progressChangedEventHandler, RunWorkerCompletedEventHandler runWorkerCompletedEventHandler)
How do I access the events generated by second sub in Vb.Net?
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Jun 17, 2010
I find that I write a lot of code within my classes to keep properties in sync with each other. I've read about Events in Classes, but have not been able to wrap my head around how to make them work for what I'm looking for.For example, in this one I always want to keep myColor up to date with any change whatsoever in any or all of the Red, Green or Blue properties.
Class myColors
Private Property Red As Byte
Private Property Green As Byte
[code]....
If one or more of those changes, I want myColor to be updated. Easy enough as above, but is there a way to work with events that would automatically do this so I don't have to put myColor = Color.FromArgb(Red, Green, Blue) in every sub routine?
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Mar 14, 2012
So, I'm at the stage where I have created checkboxes through the codes.Not through the toolbox.
They are added correctly to the form when I test it.Checkboxes can be checked or unchecked correctly.
But my problem is this:I want to use events mouseclick or mousehover with those checkboxes.
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Apr 24, 2009
I don't have a lighting bolt at the top like I normally do to add events.How do I add events in .NET 1.1 for Visual basic 2002?
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Dec 22, 2010
Is it possible to get an asp.net code (preferably vb.net) to query a sql server for results, but for it to somehow wait for a response from the server when a change is found in the records without resorting to server intensive loops?For example, I want to write a query which checks the date of a record, if the date is different from last known date, only then should the query return the results.
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Feb 15, 2010
Is there a way to translate this code in VB? Most of it is easy, but I can't figure out a way to override the event handler.
public class MTObservableCollection<T> : ObservableCollection<T>
{
public MTObservableCollection()
{
[code]....
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