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  • DataGridView formatting

    - by Vadim
    I have a DGV with columns "code" and "name". Depends of lenght of a code I want to add tabulation to the "name" cells, to show structure of a data. Like that in this picture: How is it better to do? I think there is a better way then just loop for all rows and add spaces in front of names, right?

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  • How to check if a thread is busy in C#?

    - by Sam
    I have a Windows Forms UI running on a thread, Thread1. I have another thread, Thread2, that gets tons of data via external events that needs to update the Windows UI. (It actually updates multiple UI threads.) I have a third thread, Thread3, that I use as a buffer thread between Thread1 and Thread2 so that Thread2 can continue to update other threads (via the same method). My buffer thread, Thread3, looks like this: public class ThreadBuffer { public ThreadBuffer(frmUI form, CustomArgs e) { form.Invoke((MethodInvoker)delegate { form.UpdateUI(e); }); } } What I would like to do is for my ThreadBuffer to check whether my form is currently busy doing previous updates. If it is, I'd like for it to wait until it frees up and then invoke the UpdateUI(e). I was thinking about either: a) //PseudoCode while(form==busy) { // Do nothing; } form.Invoke((MethodInvoker)delegate { form.UpdateUI(e); }); How would I check the form==busy? Also, I am not sure that this is a good approach. b) Create an event in form1 that will notify the ThreadBuffer that it is ready to process. // psuedocode List<CustomArgs> elist = new List<CustomArgs>(); public ThreadBuffer(frmUI form, CustomArgs e) { from.OnFreedUp += from_OnFreedUp(); elist.Add(e); } private form_OnFreedUp() { if (elist.count == 0) return; form.Invoke((MethodInvoker)delegate { form.UpdateUI(elist[0]); }); elist.Remove(elist[0]); } In this case, how would I write an event that will notify that the form is free? and c) an other ideas?

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  • Panel in Windows Forms Application not clearing

    - by SwiftStriker00
    I'm working on my project: [Beer Pong Management System][1], a Windows Forms application. I am currently trying to add a whole tournament mode to it. In a nutshell, I've created a TabControl, with the first tab page with the settings and setup and the second page the brackets. There is a feature for each of the match-ups, that once there is a winner is decided, a yellow cancel button will appear in order to revert the tournament. However my issue is when i click the button the next match-up does not get removed in the series is going. See below: Image Here(not high enough rep to insert image) I have tried to set the MatchUp to null, I've tried dispose(), close(). even Parent.Controls.Remove(). Even after I switch tabs which is supposed to clear all, they still sit there when i come back. I have a feeling I might be loosing a reference or something because I can't even push new teams into them, they just sit there with their buttons. Does anyone have any tips or know of any known issues that might be causing this? Thanks. [1] _http://www.cs.rit.edu/~rmb1201/pages/code.shtml

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  • What is the difference between Invoking and BeginInvoking a MessageBox?

    - by mafutrct
    In a form, compare BeginInvoke (new Action (() => { MessageBox.Show ()); })); with Invoke (new Action (() => { MessageBox.Show ()); })); What is the difference, and when should I use one over the other? How is the behavior affected by the message pump of the MessageBox? I did some testing and found that both methods block the UI. The only difference is that Invoke is actually called instantly while BeginInvoke takes a (very short) time until the code is run. This is to be expected.

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  • How to customize file dialog in wpf

    - by ManjuAnoop
    In Windows7 I am using a customized Open File Dialog( WPF application). My Open File dialog is derived from Microsoft.Win32.CommonDialog. The dialog have old look, how to change this to new look (windows7 file dialog look(Explorer style)). Code portion: private const int OFN_ENABLESIZING = 0x00800000; private const int OFN_EXPLORER = 0x00080000; private const int OFN_ENABLEHOOK = 0x00000020; protected override bool RunDialog(IntPtr hwndOwner) { OPENFILENAME_I.WndProc proc = new OPENFILENAME_I.WndProc(this.HookProc); OPENFILENAME_I ofn = new OPENFILENAME_I(); this._charBuffer = CharBuffer.CreateBuffer(0x2000); if (this._fileNames != null) { this._charBuffer.PutString(this._fileNames[0]); } ofn.lStructSize = Marshal.SizeOf(typeof(OPENFILENAME_I)); ofn.hwndOwner = hwndOwner; ofn.hInstance = IntPtr.Zero; ofn.lpstrFilter = MakeFilterString(this._filter, this.DereferenceLinks); ofn.nFilterIndex = this._filterIndex; ofn.lpstrFile = this._charBuffer.AllocCoTaskMem(); ofn.nMaxFile = this._charBuffer.Length; ofn.lpstrInitialDir = this._initialDirectory; ofn.lpstrTitle = this._title; ofn.Flags = OFN_EXPLORER | OFN_ENABLESIZING | OFN_ENABLEHOOK; ofn.lpfnHook = proc; ofn.FlagsEx = 0x1000000 ; NativeMethods.GetOpenFileName(ofn); // } [SecurityCritical, SuppressUnmanagedCodeSecurity, DllImport("comdlg32.dll", CharSet = CharSet.Unicode, SetLastError = true)] internal static extern bool GetOpenFileName([In, Out] OPENFILENAME_I ofn);

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  • How do I obtain selected rows in a DataGridView from different pages

    - by cmrhema
    Hi, I have a windows forms DataGridView, where I have data and a checkbox for each row. I will select check box for a particular row and all the selected rows will be populated in another page. if (grdEmp.Rows.Count > 0) { var selectedEmpIDs= from DataGridViewRow coll in grdEmp.Rows where Convert.ToBoolean(coll.Cells["Select"].Value) == true select coll; if (selectedEmpIDs.Count() > 0) { foreach (DataGridViewRow row in selectedEmpIDs) { selectedEmp+= row.Cells["EmpId"].Value + ","; } } } This works good only for one page. When I navigate to another page, and click the selected rows, the previous one goes off. How do I resolve it. Thanks cmrhema Note :Sorry for the confusion, When I meant it works good for a page, I meant paging. I think I need to add more inputs, There are 10 pages in the gridview. I select the first record from each page of the gridview, one after another by clicking next page( Page next button). But only the record that was selected the last is getting displayed and others and ignored off. What could be the prblm

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  • Form.Show() is not showing it's child controls

    - by Refracted Paladin
    I have a form, frmPleaseWait, that has a MarqueeProgressBar and a Label that I want to use when the UI is loading the data in a poorly structured app we have. The problem is that frmPleaseWait.Show() shows the form but not the controls in it. It is just a white rectangle. Now frmPleaseWait.ShowDialog() shows the child controls but doesn't let the UI load it's data. What am I missing? Below is a code snippet from where I am trying this. PleaseWait = new frmPleaseWait(); PleaseWait.Show(this); // Set all available HUD values in HUD Object HUD.LastName = GetCurrentRowVal("LastName").Trim(); HUD.FirstName = GetCurrentRowVal("FirstName").Trim(); HUD.PersonId = Convert.ToInt32(GetCurrentRowVal("PersonID").Trim()); HUD.SSn = GetCurrentRowVal("SSN").Trim(); HUD.MiddleName = GetCurrentRowVal("MiddleName").Trim(); HUD.MasterID = ConnectBLL.BLL.DriInterface.CheckForDriId(HUD.PersonId).ToString(); // This loads numerous UserControls with data shellForm.FormPaint(HUD.PersonId); PleaseWait.Close();

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  • LINQ 2 SQL Insert Error

    - by Refracted Paladin
    I have the below LINQ method that I use to create the empty EmploymentPLan. After that I simply UPDATE. For some reason this works perfectly for myself but for my users they are getting the following error -- The target table 'dbo.tblEmploymentPrevocServices' of the DML statement cannot have any enabled triggers if the statement contains an OUTPUT clause without INTO clause. This application is a WinForm app that connects to a local SQL 2005 Express database. public static Guid InsertEmptyEmploymentPlan(int planID, string user) { using (var context = MatrixDataContext.Create()) { var empPlan = new tblEmploymentQuestionnaire { PlanID = planID, InsertDate = DateTime.Now, InsertUser = user, tblEmploymentJobDevelopmetService = new tblEmploymentJobDevelopmetService(), tblEmploymentPrevocService = new tblEmploymentPrevocService() }; context.tblEmploymentQuestionnaires.InsertOnSubmit(empPlan); context.SubmitChanges(); return empPlan.EmploymentQuestionnaireID; } }

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  • Pass structured data from C++ app to ASP.NET web service.

    - by Odrade
    I have Visual C++ application that needs to communicate with a ASP.NET web service. Specifically, the app needs to pass structured data (e.g. objects that contain lists of structures, etc) as a parameter to one of the service methods. The C++ application is already generating an xml document that contains this data. The document is generating using an xml library, so it should always well-formed. What is a good method for passing this data to the web service? I'm thinking about passing the document to the web service as a string parameter, then deserializing to a .NET object based on an xsd. But, I hear that passing an xml doc as a string parameter is not recommended. So, my questions: What are the pitfalls associated with sending the document as a string parameter, assuming that the document itself is always well-formed? Assuming the above is a bad idea, what are some good alternate approaches?

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  • How to make nested child forms in C#.net

    - by abu
    In my windows form application I am using 10 forms.It is fine when only a parent and single child form are used at a time. But in case of multiple use of child form I am getting problem and not able to use them as child forms.They are not working as child form. Your any effort would be helpful for me. Thanking You In Advance

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  • How to loop through the ChartColorPalette properties and add to list?

    - by John M
    I am using the Microsoft Chart Controls for .NET 3.5 (C#) and have a chart in a winform. My hope is to allow the user to change the color palette based on their preference. How do I iterate through the color properties of the ChartColorPalette and add them to a combobox list? I know it should be something like: for each(something in ChartColorPalette) { combobox.items.add(something.ToString); }

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  • How to show controls hierarchy in Winform designer

    - by Cédric V
    Hi, One of our client has an old winform application that contains forms with a lot of controls on them. Some of those controls have a deep hierarchy and that make it to hard to select them in the designer. I would need to understand this hierarchy to make modification and correct some bugs, is there a tools, plugin or something to be able to clearly see this hierarchy ? Something like in the aspx source when you have a breadcrumb of where you are in the HTML hierarchy (HTML Body div etc ...) or something more visual maybe ? Any ideas ? PS : we use Visual Studio 2008, .NET 2.0

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  • Creating a form on non-gui thread

    - by luntain
    You can't access gui controls from a thread they were not created on, at least so says the message of an exception that is sometimes raised when you do it. Recently I was puzzled by seeing that forms created on background threads work just fine. My mental model was that all actions initiated by UI input is handled on the GUI thread. Clicking on a button on such a form should raise the dreaded exception (the form and all its controls were created on a background thread not the gui thread), but it doesn't. Something is wrong with my map. (*) well to be honest I have seen one problem where opening the standard open file dialog was blocking everything

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  • C# - Keep track of open child forms

    - by Nate Shoffner
    I currently have a parent control (Form1) and a child control (Form2). Form1 contains a listview that stores a list of of file data (each file is a separate item). Form2 contains only a textbox. Upon clicking on one of these listviewitems in Form1, Form2 is opened up and accesses the file's data and loads it into the textbox in Form2 in plain text format. The issue I'm having is, I would like to be able to detect, upon clicking of a listviewitem, whether that file is already opened in said child form and if so, to activate it (bring it to the front) and if it is not already opened, open it. I'm not sure what the best method of doing this would be since this can involve many child forms being open at once. This is not an MDI application. Any ideas on how this could be accomplished are appreciated and samples even more so. Thank you.

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  • Getting values from another winform and passing it to current!

    - by klm9971
    Hello: I have 2 windows forms. The 1st one who gets active during start of the program has a button in which another 2nd windows form appears which has text field in which user type their name and HIT okay. Now in the 1st form I have a variable name: nameproccessed which takes the name from the second form. But the problem is my button which is in the 1st form has more functions besides taking name, how can I stop the flow of the compiler to take first the name from the second form and then process the rest execution of the function??? Here is the snippet of my code: //1st form //Class1 public string _nameProcessed = ""; private void btnGetSomething_Click(object sender, EventArgs e) { showdial(); //some more functionalities in this function!!! } private void showdial() { InputName inm = new InputName(); inm.Show(); } //2nd form //Class2 public string name; private void btnEnterName_Click(object sender, EventArgs e) { name = tbxName.Text; Class1 ict = new Class1(); ict._nameProcessed = name; this.Close(); } Now I want to take the 'name' from the second form put it on the _nameprocessed in the 1st form and then execute the rest of the function. How can I do that? Any help!

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  • Current state of Erlang web development? Frameworks, Template languages

    - by pommonico
    Django is to Python as Rails is to Ruby. What is the current front-runner for Erlang? Recent Erlang web activity has resulted in many new frameworks but they are all still moving targets. ErlyWeb is very far along but now seems to be dead. If you were to invest significant capital into a new web product (i.e. not a hobby, you use your own money and you use other's investment in you with expectation of payback), would you choose Erlang as a web platform? If so, what framework and technologies would you choose?

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  • MonthCalendar control selection range with EnableVisualStyles?

    - by warren_s
    I'm using the MonthCalendar control and want to programmatically select a date range. When I do so the control doesn't paint properly if Application.EnableVisualStyles() has been called. This is a known issue according to MSDN. Using the MonthCalendar with visual styles enabled will cause a selection range for the MonthCalendar control to not paint correctly (from: http://msdn.microsoft.com/en-us/library/system.windows.forms.monthcalendar.aspx) Is there really no fix for this other than not calling EnableVisualStyles? This seems to make that particular control entirely useless for a range of applications and a rather glaring oversight from my perspective.

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  • DataGridView that always has one row selected

    - by Dan Neely
    I'm using a DGV to show a list of images with text captions as a picklist. Their must always be a one and only one selection made in the list. I can't find a way to prevent the user from clearing the selection with a control-click on the selected row. Is there a property in the designer I'm missing that could do this? If I have to override the behavior in the mouse click events are there other ways the user could clear the current selection that need covered as well? Is there a third approach I could take that's less cumbersome than my second idea?

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  • How to store data in a table locally and present it in C#

    - by joslinm
    I want to setup a table that can: Save the data on the user's machine Reference & present the data in the GUI Capable of adding rows dynamically during runtime What's the best way to go about this? DataGridView or TableLayoutPanel or...? I'm having trouble with SQL server CE, as I was going to connect it with the DataGridView, but I'm very new to this kind of work, and wondered if it was even necessary to use SQL.

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  • How to build a Main Menu screen

    - by flow overstack
    Good day (and happy New Year), I'm a beginner VB.Net programmer using VS 2008. I'm planning a new winform project whose main form should look more or less like this: MAIN MENU 1. DoSomething1 2. DoSomething2 3. DoSomething3 ... Please choose: [TextBox] The user can either choose from the Main Menu (by clicking an item) or enter the item number in the textbox. For example, if the user clicks DoSomething3 in the Main Menu (or alternatively enters 3 in the textbox), another form will be opened and hide the main form. What would be the best way to implement it? Specifically, I would like to know how I make so that choosing from the menu and entering a number in the textbox fire the same event. Any help or hints will be appreciated.

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  • How to focus a control in an MDIParent when all child windows have closed?

    - by Tim Gradwell
    I have a control in my parent mdi form which I wish to be given the focus if all mdi children have closed. I've tried hooking into the child form's FormClosed event and setting the focus from there but when I test it, my control is not left with focus when I close the mdi child. Can anyone tell me what I'm missing? In the sample below, "first focus" gets hit and does its job correctly (if I comment out the first focus line, my tree does not get focus on startup, so it must be doing its job, right?) Unfortunately, even though "second focus" gets hit, my tree does not end up with the focus when I close the child window. Sample using System; using System.Windows.Forms; namespace mdiFocus { class ParentForm : Form { public ParentForm() { IsMdiContainer = true; tree = new TreeView(); tree.Nodes.Add("SomeNode"); tree.Dock = DockStyle.Left; Controls.Add(tree); } protected override void OnShown(EventArgs e) { Form child = new Form(); child.MdiParent = this; child.Show(); child.FormClosed += new FormClosedEventHandler(child_FormClosed); tree.Focus(); // first focus works ok } void child_FormClosed(object sender, FormClosedEventArgs e) { tree.Focus(); // second focus doesn't seem to work, even though it is hit :( } TreeView tree; } static class Program { [STAThread] static void Main() { Application.Run(new ParentForm()); } } }

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  • How to Disable Alt + F4 closing form?

    - by Aros
    What is the best way to disable Alt + F4 in a c# win form to prevent the user from closing the form? I am using a form as a popup dialog to display a progress bar and I do not want the user to be able to close it. Thanks.

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  • How can i add to dataGridView1 a data to the last row/column?

    - by user3681442
    In top of form1 i did: private System.Timers.Timer _refreshTimer; private int _thisProcess; Then in the Form1 Load event: _thisProcess = Process.GetCurrentProcess().Id; InitializeRefreshTimer(); PopulateApplications(); Then the timer init method: void InitializeRefreshTimer() { _refreshTimer = new System.Timers.Timer(5000); _refreshTimer.SynchronizingObject = this; _refreshTimer.Elapsed += new System.Timers.ElapsedEventHandler(TimerToUpdate_Elapsed); _refreshTimer.Start(); } Then the timer elapsed event: void TimerToUpdate_Elapsed(object sender, System.Timers.ElapsedEventArgs e) { PopulateApplications(); } In the end the Populate method: void PopulateApplications() { dataGridView1.Rows.Clear(); foreach (Process p in Process.GetProcesses(".")) { if (p.Id != _thisProcess) { try { if (p.MainWindowTitle.Length > 0) { String status = p.Responding ? "Running" : "Not Responding"; dataGridView1.Rows.Add( p.MainWindowTitle, status); } } catch { } } } } The variable status show in the column2 but let's say i want that status will be display for each process/app in column5 ? How can i move it ? EDIT** Tried this: void PopulateApplications() { dataGridView1.Rows.Clear(); foreach (Process p in Process.GetProcesses(".")) { if (p.Id != _thisProcess) { try { if (p.MainWindowTitle.Length > 0) { var icon = Icon.ExtractAssociatedIcon(p.MainModule.FileName); Image ima = icon.ToBitmap(); img.Image = ima; img.HeaderText = "Image"; img.Name = "img"; String status = p.Responding ? "Running" : "Not Responding"; dataGridView1.Rows.Add(img, p.MainWindowTitle, status); } } catch { } } } } I moved the variable img to the top of the form. The problem is i see in each row this: DataGridViewImageColumn { Name=img, Index=-1 } And i don't see the icon it self. Why ?

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