MainForm having a few buttons, VolForm is inheriting MainForm. I can see this perfectly in the designer.VolForm itself contains a trackbar. Now have 2 forms. Form1 and Form2 both inherit VolForm. If I change the trackbar from Form1, and then show Form2, the trackbar is not having the same value. Is there any way to keep this trackbar the same in every form that inherits VolForm?
View 2 RepliesI have a base form and I inherit other forms from it. However, if i go back and change say the size of the base form, I don't see those changes take effect in my inherited forms. Does anyone know why that is? Is there a solution to this issue?So as far as design is goes, what exactly gets inherited by other forms?
View 9 Repliesthis line of the code makes the form see-through "User32Wrappers.SetLayeredWindowAttributes(Me.Handle, 0, _
255 * 0.4, User32Wrappers.LWA.Alpha)"
if i adjust 0.4 to 0.6 it will become less see-through.
i would like to know if i can control this variable through a trackbar and how!
Public Class Form1
Private _InitialStyle As Integer
Private Sub Form_Load(ByVal sender As System.Object, _
[Code]....
Can i change the Master Volume of my PC with a TrackBar in my form ?
View 13 Replieshow can i change opacity of a background image on a form with a trackbar.
View 1 Repliescreate a form with a TrackBar control so that when you Scroll the TrackBar it generates a frequency based on the value of the TrackBar. Beep() isn't really what I'm after. I was wanting it to smoothly transition through the frequencies. Basically, I want to create something that sounds something like a Theremin.
I've been looking online, and I can't seem to find anything. I don't even know how this would be accomplished. Is there a simple command to say "play this frequency until I tell you otherwise", or do I need to generate a .wav on the fly and have the system play that?
i would like to have a trackbar on my form that will correspond to the HUE of the color of the backgruond, given a range of 1 to 360, and another trackbar that will correspond to saturation of the color of the backgruond, within a range of 1 to 50.
View 1 RepliesI am having a problem with closing a form which I have inherited I have a form called frmAddForm_Simple, which contains 4 main controls (A Data Grid, A Save Button, A Close Button and a Text Box). The idea around the form is to create a form which could be used for inputting of many different types of data which are all entered in the same way (i.e. to add a new row to a database for [Status] table or [Location] table, all of which contain 2 columns in the database (an [Id] and a [value]). On the form I have a property called _FormChanged, which when the textbox text changes, sets the property to True. I then have the following code on the Close Button:-
Public Sub btnClose_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnClose.Click
If _FormChanged Then
If MessageBox.Show("Are you sure you want to close and discard any changes?", "Discard Changes",
[CODE]...
Is opened as a dialog (ShowDialog) and when I go to close the inherited form (by click on btnClose) and answer No to the above MessageBox the form closes anyway. Using the Debugged I have worked out that the following events occur in sequence (all of which runs in the Master Form mentioned above):-
1) btnClose_Click sub Routine runs
2) I answer No to the question do I want to close the form
3) The debugger steps over the Me.Close() line (as expected)
4) The debugger jumps up to the Sub Initialise (where ShowDialog was called from) and closes the form.
So at no point has the debugger even ran a line of code which reads Me.Close(), but the form closes anyway so Im fairly confused as to why the form should close.
My Master Form (frmAddForm_Simple) Code:-
Public Class frmAddForm_Simple
Private _FormChanged As Boolean = False
Private _FormLoading As Boolean = False
[CODE].............................
I am trying to create an inherited form- when I go to add it, I get the following message- "CustomerInformation --- The base class 'Object' could not be loaded. Ensure the assembly has been referenced and that all projects have been built"
View 3 RepliesI'm currently working on binding an objects properties to fields on a Form. Whilst I have managed to get it so that I can get standard objects to bind, I am having a problem figuring out how I would go about binding an inherited object.
For example, if I had a Client class (the parent class) and then two sub-classes called CompanyClient and IndividualClient. The CompanyClient would have an extra field company name for example.The problem I'm having is that I'm not certain how to set up the binding, as if I set up the binding against the Client class then I would be missing the Company Name property for the CompanyClient, if I set up against the CompanyClient, then it wouldn't work with the IndividualClient as it doesn't have all the fields.
I know I could get around this by having different forms for each of the different Client types, but as almost all of the properties are the same I would like to avoid this if I can.I was wondering whether anyone knows how I might be able to go about doing this
I have a an inherited form that has a panel control on it. I want to paste other controls onto this panel but the paste option is grayed out and won't let me do it. I made sure that the template form did not lock the panel. I'm stymied from making progress until I can get this resolved.
View 2 RepliesUnable to add Controls to Inherited Form I should be able to add an inherited form by simply[code]...
View 2 RepliesI'm trying to create my own control to build a custom planning on it.After trying it with loose controls I got an error but after advice on my previous post, I redraw everything.I have now the header of the control finished, the header shows the days of the month for as many months that fit in the window.Now I want to put the list of data below it, but it will be more than the windows height, so I need to have a scroll bar that will scroll the data but not the header.I would not like to design my own scrollbar and rather use the scrollbar control for it, but when I put it in, I cannot use the NEW keyword.example:
Dim sb
As
ScrollBar
with this I get the error message: 'New' cannot be used on a class that is declared 'MustInherit'.How can I get a scrollbar on my form to scroll the list only (so not the header)?
This might seem like an odd question, but is there a way to make it so that any form that is created based on another, would have some comments in the code behind of the new form?
For example, i create a form called frmONE, and i put in code like this:
Overridable Sub frmONE_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
'Make sure you call these functions, in this order:
[Code]....
Pretending I have a class that inherits off Control, how would I handle the parent form's Resize and Move events within the control? I have a painting glitch that happens when the form is resized or moved. Right now in the form I just have:
vb.net Private Sub frmMain_ResizeMove(ByVal sender As Object, ByVal e As System.EventArgs) _ Handles Me.Resize, Me.Move Me.Refresh()End Sub
But this can't be the proper way to do it, considering Refresh() invalidates all children (will be slow and flashing if the form has lots of controls). I want to basically do the above code inside the control.
Edit:This is the glitch after a resize of the parent form:
And this is what the button is supposed to look like:
Also, I experience this issue if something like a message box is dragged over top of it. How can I remedy these issues by forcing a repaint?
I want to carry out bidirectional synchronization.I have implemented the code and procedures in the walkthrough however i have nearly a hundred forms and more than 50 tables how do i go about that
View 1 RepliesI have a question regarding the synchronization in multi threading.
I have a function called send which i am calling in a for loop for every data row.
This function creates threads to send emails to different people.
Public Sub send(ByVal Conn As Data.DataRow, ByVal job As Data.DataRow)
MyThread = New Thread(AddressOf Me.start)
MyThread.Start()
End Sub
But every thread created is writing to a log file at different points of time. So, there are very high chances that 2 threads write to the same file at the same time. So, do i need to use any kind of synchronization mechanisms here ? or is it fine without them ?
I want to know how dropBox is able to synchronize the large data files without replacing or re-uploading the files again to the dropbox server
Example: an encrypted zip archive
Suppose I've a 1GB encrypted zip archive file Fully synchronized on my computer and on the dropbox servers. On my computer I added to that zip archive file a file of size about 5MB then saved the file on my computer. Dropbox is able to synchronize zip archive file without re-uploading the whole file again instead it just update it with the small change I've done. Also TrueCrypt containers works in that manner.
Beginning development with SQL Server 2008, VB - Visual Studio 2008 on an application that will deploy laptops remotely for 6 months or more. The laptops will have no network or internet connection. There is a requirement to sync DB changes via shipment of USB flash drives.
The remote app will have a subset of the home database data. Some tables need to be synced bi-directionally, some uni-directionally. When the laptop comes home, it will do one last sync, the local DB will be wiped, and it will connect to the home DB.
Being that there are some identity key columns and the remote is only a subset of the the home, I am not sure that SQL Server replication or synchronization functions can be utilized.
Should I Create SQL Server Compact DB's on the remote system when it is deployed and do a table by table compare (in code) to another compact DB created on the flash drive when a sync is needed?
I was trying to work out the best method of synchronising an update of files via vb.net. I want to automatically update some files in a few folders from an FTP site to a local drive. This would ideally be the same folder structure, but on a specified local folder. I have looked at the FTP methods in .net and am able to transfer individual files successfully, but wondered if there was an elegant method to collecting the entire folder from the FTP and it's contents to be re-created locally. I have established the reading of an XML via linq from the ftp to establish an update single and decide whether the local machine is up-to-date or not, it's just the transfer of the folders that I'm stuck on as it's different to using a IO method.
View 1 RepliesI need to develop a synchronization mechanism for 2 or more containers tha contains objects (generic classes) In each container the origin of the object can be:
1) Created New
2) Imported
3) Recovered from the bin (they have been previously deleted)
The main problem that I am facing is this one If One object has been deleted in Container A it should be Deleted in Container B as well during synchronization If one object has been DELETED in Container A (1 hour ago ) and teh same object has been DELETED and RECOVERED in Container B ( 1 hour and 1 second ago) what should i do? keeping in consideration that between the 2 computer the time is surely not identical?
I am trying to test if my synchronization mechanism is set well and so for debug purposes, inserting a deliberate deadlock as under
mtx.waitone(-1)
mtx.waitone(-1)
but when i step through the code in the debugger, it runs fine without getting stuck here. I am sure there is no other thread doing a release on the mutex mtx
I don't know if my question is sql server related or vb.net or both. so I will ask it here. Let say I have 3 sql servers with replication among them connected together by vpn. let say i have a customer C1 exist on first server S1 and his account is 1000$ which is the same on second server S2 on S1 they enter a new receipt, so the customer C1 on S1 balance became 1100$ while it still 1000$ on S2, and it need 1-2 min for the replication to finished if during this 1-2 min, S2 is entering invoice, C1 balance will show 1000$ while it is actually 1100$ (because the replication did not finished yet) My first idea is to make sql query getting the customer balance from 3 servers and compare them. How I can tell that the customer account are not the same on both servers or check if the replication is finished for that table holding the customer balance?
View 2 RepliesWhen I try to add an inherited form, I get an error:
"Value does not fall within the expected range"
(Add-->New Item-->Windows Forms-->Inherited Form), I get the "Add New Item Project Name" window. When I click the Add button, I get the error.
I'm not sure if I already saw a trackbar inside a menu strip, but there is a way to add it? Or even a numeric dropdown?
View 2 RepliesMy app deals with football, and the line of scrimmage. There is an additional line, called the line to gain, used for showing where a first down is earned. I'd like to have a trackbar with two arrow on it... one for the Line of Scrimmage, and the other for the Line to Gain.
View 6 RepliesI need to use a trackbar as a scrollbar, but the problem is that the min value is at the bottom i need it to be 0 at the top and maxvalue at the bottom..
View 11 RepliesI want to add values to trackbar as shown below in figure.If someone scroll the track bar resp value should be shown in that text box.
View 5 RepliesIm working on a Music player. I need only 2 more things in it but i cant figurate 'em out. i use a LISTBOX for the playlist. I want to add a trackbar that follows the music and i can track with it (like every music palyer). The second thing is i want the palyer to start the selected file if i duble-click on it in the playlist. [code]
View 7 Repliesknow the millisecond interval, used by the framework trackbar, between calling the ValueChanged event when moving the grip with a mouse?I've implemented my own trackbar and I'd like the behaviour to be consistent with what the user expects.I've had a look in reflector but it's one of those controls where most of the implementation is not viewable.
ETA: Actually, thinking about it, it's not as simple as that. For small changes, the TrackBar is raising the event for every change. However, if you make a large fast change with the grip, it will not raise the event for every step. Just wondering exactly how the framework does this?