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  • Why .NET does not allow cross-thread operations?

    - by RHaguiuda
    This question is not about what is a cross-thread operation, and how to avoid it, but why internal mechanics of .NET framework does not allow a cross-thread operation. I can`t understand why a SerialPort DataReceived event cannot update a simple text box on my form and why using delegates this is possible?

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  • Second Thread Holding Up Entire Program in C# Windows Form Application

    - by Brandon
    In my windows form application, I'm trying to test the user's ability to access a remote machine's shared folder. The way I'm doing this (and I'm sure that there are better ways...but I don't know of them) is to check for the existence of a specific directory on the remote machine (I'm doing this because of firewall/other security restrictions that I'm confronted with in my organization). If the user has rights to access the shared folder, then it returns in no time at all, but if they don't, it hangs forever. To solve this, I threw the check into another thread and wait only 1000 milliseconds before determining that the share can't be hit by the user. However, when I do this, it still hangs as if it was never run in the same thread. What is making it hang and how do I fix it? I would think that the fact that it is in a separate thread would allow me to just let the thread finish on it's own in the background. Here is my code: bool canHitInstallPath = false; Thread thread = new Thread(new ThreadStart(() => { canHitInstallPath = Directory.Exists(compInfo.InstallPath); })); thread.Start(); thread.Join(1000); if (canHitInstallPath == false) { throw new Exception("Cannot hit folder: " + compInfo.InstallPath); }

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  • two UserControls, one page, need to notify each other of updates

    - by jeriley
    I've got a user control thats used twice on the same page, each have the ability to be updated (a dropdown list gets a new item) and I'm not sure what might be the best way to handle this. One concern - this is an older system (~4+ years, datasets, .net2) and it is amazingly brittle. I did manage to have it run on 3.5 with no problems, but I've had a few run-ins with the javascript validation (~300 lines per page) throwing up all over the place when I change/add/modify controls in the parent.

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  • Using a WinForm as a Windows Installer Custom Action

    - by Serexx
    Hello - I am working on in installer project that needs to gather some info and act on it during the install (mainly online key retreival and registration). The Setup Project UserInterface templates seem inflexible and poorly documented so I am looking at opening a WinForm as a Custom Action. I know this is possible because I see reference to it in many places but this is my first Windows Installer experience and so far it is mired in googled contradictions, partial or outdated information and guesswork... erg.... Does anyone have (even a pointer to) a clear concise description of how one gets this done in a VS 2008 WinForm project... Many thanks for inputs

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  • Form.ShowDialog() does not show form.

    - by clawson
    I've come across a situation where I try to run a simple line of code in a method Dim res As DialogResult = frmOptions.ShowDialog() but nothing happens. The dialog box will not appear. If I run this method from another location in the code it executes fine (i.e. displays the form in dialog mode and code executes fine thereafter). Hence, it may be the way in which I arrive at this code that is causing my problem, but I cannot see to find what is wrong. When I pause the debugger the line of code is highlighted in green but I can't see to step over it or into it. Any idea what may cause this to happen, or what I should be looking for that might be causing the problem?? Thanks for the help!

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  • Dynamically showing fields to a Dev Express Grid view on windows form

    - by Bhaskar
    In one of windows application in C# , I am using Dev Express Grid view control to bind some data and display it to user. I have custom business objects with properties defined for this purpose.Then I simple set the DataSource of the grid to the list of my custom business objects. A while ago , there came a requirement which means that the columns to be displayed on to the grid will be dynamic. This means I cannot know at design time which fields I will need to display. I was thinking of abandoning setting the DataSource and populating the grid manually by code. But I think this will cause many of the grid's features not to work properly, for example , grouping the data by drag n drop of fields to the header area etc. Is there any way to tell a grid at runtime to skip certain fields from a list of BO's when databinding to the grid ?

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  • WebBrowser control not navigating to links to "file://" protocol URIs

    - by Nick Butler
    I am setting the DocumentText property to an HTML string that contains links like: <a href="file:///D:/dir/file.html">NewPage</a> The links are shown properly in the WebBrowser, but nothing happens when I click them. The Navigating, Navigated and DocumentComplete events do not fire - nothing seems to happen at all. AllowNavigation is true and other links using HTTP are working. Any ideas please? Nick

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  • How can I reorder columns in a DataGridView?

    - by Luiscencio
    so I fill my DGV with some data and set some columns invisible: var part = inventory.espiromex_product.Where(p => p.descriptionsmall == cmbMainP.Text).First().partnumberp; dtgAssy.DataSource = inventory.espiromex_productsub.Where(p => p.partnumberp == part); dtgAssy.Columns["idproductsub"].Visible = false; dtgAssy.Columns["partnumberp"].Visible = false; dtgAssy.Columns["partnumbersubp"].Visible = true; dtgAssy.Columns["quantity"].Visible = true; dtgAssy.Columns["comments"].Visible = true; dtgAssy.Columns["assemblyno"].Visible = false; dtgAssy.Columns["assemblynodesc"].Visible = false; dtgAssy.Columns["uomid"].Visible = true; dtgAssy.Columns["subassemblylevelnumber"].Visible = false; dtgAssy.Columns["scrappercent"].Visible = true; this is just fine but columns are sorted Alphabetically, How can I reorder columns programmatically? note that inventory is an Entitie and I am using Linq to Entities.

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  • How to check whether the form has any ShowDialog() forms open?

    - by kornelijepetak
    I have a form MainForm with several properties/methods that are accessed from another thread. At some point I might open a form AuxForm with ShowDialog() and then while that modal form is open, the other thread still modifies the MainForm's properties. This is all desired. In one of the methods accessed from another thread I need to execute some code, but only if the modal AuxForm is not open. Is there any way to check this (by using .NET WF Form properties) or I need to use a flag variable? NOTE: None of these properties/methods modify the controls (so no Invoke is required).

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  • Customising the .NET PrintPreviewDialog?

    - by Gary Willoughby
    Currently i'm using the PrintPreviewDialog to open a window to preview the printed pages before they are sent to a printer. The problem is though that it first appears very small, at the top left of the screen and the buttons are too small. Is there anyway i can set a starting size for this dialog or start position or even make the little buttons a little bigger? Or do i need to implement my own?

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  • C# NotifyIcon behaviour on Windows 7 with MouseClick, MouseDoubleClick events

    - by binball
    Hi, I have strange behaviour with my app after run it on Windows 7. It's connected with NotifyIcon while app is minimized. What should happens: 1) Click once on icon with mouse left button then Balloon with some text should appears 2) Double click on icon will show again app window On Windows 7 MouseDoubleClick is also fired but window is not showing. I don't know why. The same code works good on Windows XP. private void notifyIcon_MouseClick(object sender, MouseEventArgs e) { if (e.Button == MouseButtons.Left) { this.NotifyIconShowBalloonWithData(); } } private void notifyIcon_MouseDoubleClick(object sender, MouseEventArgs e) { this.Show(); WindowState = FormWindowState.Normal; notifyIcon.Visible = false; } What did I wrong? :) Thanks in advance for your answer.

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  • Create list-of-controls in Windows.Forms

    - by leiflundgren
    I have decided that I would like to have a list with "complex context", i.e. of custom-controls. (The goal is something looking like a buddy list, with photos, status-icons, text, "start-chat-button".) But I like it to behave as a list: scrollbars, possibility to select multiple items etc. When I have been looking at ListView and ListBox I only see that I can add text and an icon, but not arbitrary controls. I'm I missing how this is done? Or should I use something else then ListView/ListBox?

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  • putting numbers in an array into arraylist

    - by arash
    i have numbers that user enter in textBox3 and i converted them to an array nums now i want to put half of them in arraylist A and half of them in arraylist B how can i do that?thanks string[] source = textBox3.Text.Split(','); int[] nums = new int[source.Length]; for (int i = 0; i < source.Length; i++) { nums[i] = Convert.ToInt32(source[i]); } ArrayList A = new ArrayList(); ArrayList B = new ArrayList();

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  • Arrow keys and changing control's focus hang the application

    - by sthay
    I have a usercontrol that contains a FlowLayoutPanel (topdown flow) with a bunch of radiobuttons. The control exposes a CheckedChanged event that fires whenever one of the radiobuttons's check changed. My form contains the usercontrol and a textbox. I subscribe the usercontrol's CheckedChanged event and depending on which radiobutton gets checked, I either disable the textbox or put a focus inside the textbox. All this works fine with mouseclick when changing the radiobutton's check state. However, this will hang indefinitely when using the arrow keys. I don't understand why the difference. The following are steps to reproduce the behavior I'm seeing: Create a usercontrol and drop a FlowLayoutPanel control and set its FlowDirection = TopDown. Then add two radiobuttons to the FlowLayoutPanel. Provide an event handler in the usercontrol public event EventHandler CheckedChanged { add { radioButton2.CheckedChanged += value; } remove { radioButton2.CheckedChanged -= value; } } Create a windows form and drop the above user control. Add a textbox and set Enabled to False. Subscribe to the usercontrol's CheckedChanged event as follows private void userControl11_CheckedChanged(object sender, EventArgs e) { textBox1.Select(); } Run. Notice that if you use the mouse to click between the radiobuttons, thing works fine; but it will crash if you use the up/down arrow keys.

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  • Quicken like Windows Forms application

    - by WinFXGuy
    Hi All, I need to build a quicken like application, where data needs to be secure. I don't see any database being used by Quicken. I could use XML, MDF or Access database, but data is not secure in the tables. What is the best option? How does Quicken handle it? My application may also have document attachments as well. The functionality of this application is similar to quicken but not an accounting/financial in functionality. Thanks a bunch!

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  • Upgrade .NET 1.1 WinForm/Service to what?

    - by Conor
    Hi Folks, We have a current WinForm/Windows Service running in .NET 1.1 out on various customer sites that is getting data from internal systems, transforming it and then calling a Web Service synchronously. This client app will no longer work in Vista or Windows 7 etc.. and its time to update!! I was looking for ideas on what I could do here, I didn't write the App and I have the Business team telling me they want the world but I need to be realistic :) Things the service must be able to do: - Handle multiple formats from internal system and transform to a schema SAP, ERP etc.. - Run silently and just work on customer sites (it does currently albeit .NET 1.1) - The Customers are unable to call our web service from their sites as they are not technical enough. - Upgrade it's self when updates occur (currently don't have this capability) Is there anything I can do here other than upgrade the service to run in .NET and add a few more transformation capabilities e..g they want the customer to be able to give us a flat file, an xml file, a csv and the service transforms it and calls the Web Service? I was hoping in this day and age we could use the Web, but automating this 100% rules it out in my eyes? I could be totally wrong!! Any help would be gratefully appreciated! Cheers. Conor

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  • Hanging Forms When I Drag And Move My Forms

    - by hosseinsinohe
    I Write a Windows Application By C Sharp. I Use a Picture in Background of my Form (MainForm) And I Use Many Picture in Buttons in This Form,And also I Use Some Panel And Label with Transparent Background Color. My Forms,Panels And Buttons has flicker. I solve this problem by a method in this thread. But Still when other Forms Start over this Form,my Forms hangs when I Drag and Move my Forms over this Form.How can I Solve this Problem to Move And Drags my Forms easily And Speed? Edit:: My Forms Load Data From Access 2007 DataBase file.I Use Datasets,DataGridViews And Other Components to Load And show Data in My Forms.

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  • Why do LINQ to Entities does not recognize certain Methods?

    - by Luiscencio
    Why cant I do this: usuariosEntities usersDB = new usuariosEntities(); foreach (DataGridViewRow user in dgvUsuarios.Rows) { var rowtoupdate = usersDB.usuarios.Where( u => u.codigo_usuario == Convert.ToInt32(user.Cells[0].Value) ).First(); rowtoupdate.password = user.Cells[3].Value.ToString(); } usersDB.SaveChanges(); And have to do this: usuariosEntities usersDB = new usuariosEntities(); foreach (DataGridViewRow user in dgvUsuarios.Rows) { int usercode = Convert.ToInt32(user.Cells[0].Value); var rowtoupdate = usersDB.usuarios.Where(u => u.codigo_usuario == usercode).First(); rowtoupdate.password = user.Cells[3].Value.ToString(); } usersDB.SaveChanges(); I must admint it is a more readable code but why cant this be done?

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  • What causes my borderless C++/CLI app to crash when overriding WndProc?

    - by Ste
    I use a form with border NONE. I need to override WndProc for resize and move form. However, using this code, my app crashes! static const int WM_NCHITTEST = 0x0084; static const int HTCLIENT = 1; static const int HTCAPTION = 2; protected: virtual void Form1::WndProc(System::Windows::Forms::Message %m) override { switch (m.Msg) { case WM_NCHITTEST: if (m.Result == IntPtr(HTCLIENT)) { m.Result = IntPtr(HTCAPTION); } break; } Form1::WndProc(m); } virtual System::Windows::Forms::CreateParams^ get() override { System::Windows::Forms::CreateParams^ cp = __super::CreateParams; cp->Style |= 0x40000; return cp; } How can I fix my code not to crash but still allow my form to be moved and resized?

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  • How can I make the WebBrowser control navigate to a specific webpage?

    - by tee
    How can I make the code when run the code it go to samsung.com private void webBrowser1_Navigated(object sender, WebBrowserNavigatedEventArgs e) { webBrowser1.Navigate("www.samsung.com"); } Please correct it when run program it go to samsung.com using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; using mshtml; namespace webhiglight { public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void webBrowser1_Navigated(object sender, WebBrowserNavigatedEventArgs e) { webBrowser1.Navigate("www.samsung.com"); } private void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e) { if (webBrowser1.Document != null) { IHTMLDocument2 document = webBrowser1.Document.DomDocument as IHTMLDocument2; if (document != null) { IHTMLSelectionObject currentSelection = document.selection; IHTMLTxtRange range = currentSelection.createRange() as IHTMLTxtRange; if (range != null) { const String search = "ant"; if (range.findText(search, search.Length, 2)) { range.select(); } } } } } } }

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  • Cascade the MDI forms of a Splitter panel

    - by BDotA
    I am showing my MDI windows inside the main form but in one part of the splitter panel, like this: Form2 f2= new Form2(); f2.MdiParent = this; f2.Parent = this.splitContainer2.Panel2; f2.Show(); but the problem is that I cannot cascade them if I write a code like this: this.LayoutMdi(System.Windows.Forms.MdiLayout.Cascade); "this" is the parent form. the main form. Hoe can I cascade them? thanks all.

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  • Synclock a section of code while waiting for ShowDialog to return

    - by clawson
    I'm having trouble working out how to lock my application out of a section of code while it waits for a response from an external program. I've used Synclock on a section of code with the Me object in the expression. In this Synclock I call an overridden ShowDialog method of a dialog box, which has a timeout parameter, but does return the value from the underlying ShowDialog function call ,once the timer is setup. Works like this. SyncLock Me Dim frmDlgWithTimeout As New frmDlgWithTimeout ' dialog box with overridden ShowDialog ' Dim res As DialogResult = frmDlgWithTimeout.ShowDialog(10 * 1000) ' 10 sec timeout ' End SyncLock Now, external programs may raise events that bring my application to this Synclock but it doesn't prevent it from entering it, even though the ShowDialog function hasn't returned a value (and hence what I thought would keep the section of code locked). There is only one instance of the object that is used for lock in the program. Your help is greatly appreciated.

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