I'm attempting to run different tasks in there own processes, waiting until each is done while keeping the UI responsive. So far it works exactly how I want it until I try to reuse some of those processes....here is a sample of the
Private WithEvents TaskOneProcess As Process
Private WithEvents TaskTwoProcess As Process
Private WithEvents TaskThreeProcess As Process
[code]....
This is a over simplification of what's going on but it gets the point across. So it works exactly as expected, a button is pressed and the sequence starts. As each task gets disposed it recalls the StartFixing statement which then calls the next one in order until they are all done. BUT when I go to do it a second time the Disposed never fires assuming since it's already disposed. How do I recreate the same named process so it can be reused and still have it fire the disposed event?
I was wondering what the best approach is for sharing a menu across all wpf windows/views. My Application doesnt really fit the navigation model, so will probably use a Ribbon control. I am leaning towards creating a user control for the menu and dropping it on each view, but have also seen Josh Smith's msdn article, where he loads user controls.
I am working in vb2008. Is there a simple way to clone the contents of a datarow in a datatable into a new datarow instance that can be added elsewhere in the table. Can I create a new instance of a datarow and set it equal to an existing datarow?
Say I have a connection to a database. After reading some stuff I want to connect to the same database. So I naturally use the first database mysqlconnection.serverstring the password and username is not included in connect1.ConnectionString. So how can I do so? Is this by design?
I am upgrading a system that has a Product Table with a Product No Field.This is a string field but most of the existing product Nos are numeric but all over the place.I want to provide a default numeric Product No when the Users are creating a new product record.All I can think of is to use the Identity Field [ProductID] and test to see if it has been used and if so keep incrementing to find the next free numerical, available No.A better solution would be to start at 1 and increment to find the first available but it looks to be several hundred records into the Table. how to find the first available number?
I have a set of controls and code behind them that I'd like to reuse on multiple forms. How can I do this? I know of reusing code via modules, but I'm not sure how I can add the same controls and their underlying code. If I achieve this, will changing data on one form affect the values of another form when they're both open? For example... Cbox1's selected item affects the choices within Cbox2, and Cbox2's selected item affects the choices within Cbox3 (and so on). So if I do something on Form1's Cbox1 and it changes Form1's Cbox2, will it NOT change Form2's Cbox2?
Not sure if this has been asked before (couldn't find an answer), but is there a way to reuse a user.config file from a previous version of the application? For example a user.config file is stored in:
C:UsersJohnnyAppDataLocalCompanyApplicationName.exe_Url_wxcnyrmstqy3oj1qwckdjq3gjqkq4fel1.0.0.0user.config After a new version is installed it gets stored in:
C:UsersJohnnyAppDataLocalCompanyApplicationName.exe_Url_wglmejvw01nagu5t1y5yl12chynjomny1.0.0.1user.config The user then has to enter all settings again, even if the new version does not save more settings. An other problem is that although the user.config file is very small, it does get messy after a while when newer versions of the application get installed. Is there a way to clean up the unused user.config files and their folders?
It's the same problem with System.Windows.Forms.Application.LocalUserAppDataPath, that I'd like to use to save other files (containing Listview data), which points to:
C:UsersJohnnyAppDataLocalCompanyApplication1.0.0.0 The Listview data and other files created by the app can't be used anymore.This can be solved by getting the user's appdata folder with Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData) and creating a new folder there with the name of the application. But this means there's one folder where the application is installed (user can choose this folder in the installer), one folder to save my own files to and one folder where VB stores the user.config file.
Can something be done about this "mess" or is this just something I have to live with?
I save the size of a form to a variable (One Size or two Integer variables--doesn't matter), and then I close the form. Before reopening the form, I set the form size to the size I saved before--which by all accounts of logic and reason should exactly the same. Except, no, it's not. On one system the form "grows" horizontally and vertically by 15 or 16 pixels. On another system the form grows only vertically 15 or 16 pixels. I'd love for someone to explain this perfectly insane, yet MS typical, behavior to me.
created a menustrip (MenuStrip1) by dragging the tool onto my form (form1.vb). And designed the headings/items etcI have now created another form (form2.vb) within the same project.I would like to use MenuStrip1 that i designed for form1.vb in my new form2.vb.
I am very familiar with modules from my time with VB and my other programming, but what is the most commonly used practice and the best way to go about this for a website application with ASP.NET? Say I have multiple pages (in multiple directories; some in the root directory, some in child directories from the root) that will call the same set of functions and subroutines, how do I go about putting this reusable code in a place where the pages and their respective classes can call the functions/subroutines?
First of all, I wasn't sure whether this was VB.NET or General Developer content... It's not technically about VB.NET code, but it's not very general either since it is specifically about Visual Studio. Feel free to move it if required.A while back I realized that all of my database connection code was getting very biolerplate. had 'developed' my own method of connecting to an Access database and storing the results. Basically, for each table I create one 'Manager' class and one 'Entity' class. The Entity class represents a single record in the database and has properties for each field.
I have a form which loads another form, does a little initialization, then hides itself and shows the other form. When the user finishes with the second form, it returns back to the first.[code]..
I thought it might be a timing/speed thing (somehow the server was too fast to load or unload the form), but I put a 5 second sleep between every line of code and that didn't help at all.
i am facing a huge problem with the "Cannot access a disposed object. Object name: 'TreeView'." error.
On a windows forms of mine i use a custom windows explorer object.
And here come the code parts...
On the selected node event, i load the images found within the selected directory to the FlowLayoutPanel.
Private Sub ExpTree1_ExpTreeNodeSelected(ByVal SelPath As String, ByVal Item As ExplorerControls.CShItem) Handles ExpTree1.ExpTreeNodeSelected 'Loop until all images are loaded. LoadImagesToFlowPreviewPanel()
I have a windows form in .NET that will serve as a wizard to achieve something. This contains 3 steps: Step1, Step2, Step3.
Each step is again actually a user control. Main form contains a panel that display the current Step. When I change among steps then:
1) Dispose the current user control by calling its Dispose() method.
2) Clears the main form panel
3) Initialize the user control of next step and add it into the main panel
Now, the issue is, User control of step one contains one more user control. When I change to another step and come back to step 1, I get following error:
"Cannot access disposed object."
Because I have to first dispose the user control before actually displaying the another step. And when I come back to step 1 and tries to open the user control on step 1, it gives the aforementioned error.
Protected Overrides Sub LoadForm() MyBase.LoadForm() Try 'StartProcess might be causing an error (error msg is issue with loading config, which would be incorrect) StartProcess() [Code] .....
I can run this 100 times under the exact same conditions and it seems like 40 times it will crash with the following error: "Cannot access a disposed object. Object name: 'frmImportExport'."
It will either die on 'within StartProcess() Dim __Delegate As New _Delegate(AddressOf StartProcess) Me.Invoke(__Delegate) or Dim D As New _Delegate(AddressOf SOPERATION)
The form isn't being disposed manually anywhere that I see, and this code is being executed on formload. It's a subform that is to be displayed within a main form.
How do I re-open a form that has been disposed?I tried using GC.Collect() which did not work.I have 2 forms.The first form being the main form and the second being the secondary form. I open the secondary form with form one.Form 2 two opens and after I am done with it I close it.Now I want to open up the second form again and BAME! Error.Cannot access a disposed object.
i have a query. i created two forms a and b. if i click ok button in form a , form b should open. and i did it. but again if i click the button it says that i can open a form once it is disposed.
"Sometimes your code requires an unmanaged resource, such as a file handle, a COM wrapper, or a SQL connection. A Using block guarantees the disposal of one or more such resources when your code is finished with them. This makes them available for other code to use. Managed resources are disposed of by the .NET Framework garbage collector (GC) without any extra coding on your part. You do not need a Using block for managed resources."
So, which unmanaged resources must disposed manually and which disposed automatically of by the .NET Framework?
I have an application the contains several excel files bundled with it. I'm not opening the files and processing them within my application. These files contain a data-connection to reload all of the pivot-tables within each excel file. I have a 'link' on my form, that when clicked, it determines which file to open and calls a sub using filename and executing Process.Start(filename) for any excel file I want to open. I have no problems opening any one of the files and then exiting excel.
The problem is when I 'close' a file, but don't exit Excel; then try to open another file(clicking link on form)... it creates a new instance of Excel.
I know from experimenting that the fileopendialog form will 'reuse' an existing Excel instance, IF it does not already have a file open.
How can I do the same thing without using the fileopendialog?
I don't want the end-user to have access to the folders where these files live. That's why I have multiple 'links' on my form, one for each xls that already exists. I just want them to be able to click on a link and the xls file opens AND if they choose to merely 'close' a file and not exit... Don't create a new instance of Excel, but re-use the existing one.
I just installed VS 2010 Ultimate Beta2. installation was successful. When I perform the scenario of (File --> Open -- > New), I get that error message. Error message "Cannot access a disposed object. Object name: 'MarshalingWindowFrame'."
I seem to be getting a random abject disposed exception.Sometimes it occurs when I move from 1 form to another, sometimes it happens when a timer activates.It says the object name is "". How am I supposed to look for an object called nothing. I'm using vb express 2010 on windows 7.
Code: System.ObjectDisposedException was unhandled Message=Safe handle has been closed Source=mscorlib
