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• c# control location precision

  - by AC

  I need more precision then integer based locations when puttng controls on a form. It seems control.location only supports Point. Is there a work around for this? Point p = new Point(100, 200); this.Location = p;// this works of course PointF pF = new PointF(100.04f, 200.08f); this.Location = pF;// this does not work of course because Location expects a Point not PointF Is there some setting on the base form, or base control I can set to have more location precision?

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• C# - How to change window state of Form, on a different thread?

  - by Dodi300

  Hello. Does anyone know how I can chage the window state of a form, from another thread? This is the code I'm using: private void button4_Click(object sender, EventArgs e) { string pathe = label1.Text; string name = Path.GetFileName(pathe); pathe = pathe.Replace(name, ""); string runpath = label2.Text; Process process; process = new Process(); process.EnableRaisingEvents = true; process.Exited += new System.EventHandler(process_Exited); process.StartInfo.FileName = @runpath; process.StartInfo.WorkingDirectory = @pathe; process.Start(); WindowState = FormWindowState.Minimized; } private void process_Exited(object sender, EventArgs e) { this.WindowState = FormWindowState.Normal; } It's meant to run a program and minimize, then return to the normal state once the program has closed. Although I get this error "Cross-thread operation not valid: Control 'Form1' accessed from a thread other than the thread it was created on." Any idea how to get this to work? Thanks.

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• Fill Combo-box via DataSource Using Values from Various Columns

  - by peace

  Employee emp = new Employee(); comHandledBySQt.DataSource = emp.GetDataFromTable("1"); comHandledBySQt.DisplayMember = "FirstName"; The above code displays drop list of employees first names in a combo box. I want first name and last name to be displayed. How can i do it? I tried to include two columns FirstName and LastName as below but didn't work. comHandledBySQt.DisplayMember = "FirstName" + " " + "LastName"; Any help will be appreciated.

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• Consume windows form events in C++/CLI

  - by shadeMe

  How do I add an event handler method to, say a TextBox's TextChanged event ?

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• How do I detect if a System.Windows.Forms.Label with AutoEllipsis is actually displaying ellipsis?

  - by SchlaWiener

  I have a Windows Forms Application where I display some client data in a Label. I have set label.AutoEllipsis = true. If the text is longer than the label, it looks like this: Some Text Some longe... // label.Text is actually "Some longer Text" // Full text is displayed in a tooltip which is what I want. But now I want to know if the label makes use of the AutoEllipsis feature at runtime. How do I achive that?

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• How do I Data-Bind dual DateTimePicker to a single DateTime object

  - by S.C. Madsen

  Hi, I have a simple form, with two DateTimePicker-controls: One for date, and one for time. The thing is these two controls are supposed to represent a single point in time. Hence I would like to "Bind" them to a single DateTime property on my form (for simplicity). I did the following: // Start is a DateTime property on the form _StartDate.DataBindings.Add("Value", this, "Start"); _StartTime.DataBindings.Add("Value", this, "Start"); But hooking into "ValueChanged" event, yields mixed results... Sometimes I get exactly what I want, sometimes the updates of the property are "sluggish". I figured this way of splitting into two DateTimePicker's was fairly common. So how to do it? Update: There is possibly multiple questions in there: How do I bind a DateTimePicker (Format: Date) to a DateTime Property on a form? Then, how do I bind yet another DateTimePicker (Format: Time) to the same property? I'm using Visual Studio Express 2008 (.NET 3.5), and I seemingly get ValueChanged events from the DateTimePickers before the value is changed?

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• Adding controls dynamically at design time vb.net

  - by chris

  I have been developing some custom smart tags. I am using a DesignerActionMethodItem which gets me to a fired method in code. When I try to hit the controls.Add the control is added but it seems the designer is unaware of it. It is never serialized and it goes away when the form is refreshed in the designer. Any help would be greatly appreciated. I am sort of stuck and google hasn't helped me. Please don't send me anything about smart tags that has nothing to do with adding controls dynamically at design time, I have already read so many looking for this.

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• Using Application Settings and reading defaults from app.config

  - by Peter Goras

  Hi, I need to deploy a Windows Forms application using ClickOnce deployment. (VS2008, .NET 3.5) And I need to provide a configuration file for this app that any user can modify. For this reason, I am using Application Settings instead of standard appSetttings in app.config so I can separate the the user config from app config. see http://msdn.microsoft.com/en-us/library/ms228995(VS.80).aspx Creating a Settings.settings file using VS generated a class with hard-coded default values like this: [global::System.Configuration.DefaultSettingValueAttribute("blahblah")] public string MyProperty ... WTF? I want to read the default values from the app.config! So I created my own class deriving from ApplicationSettingsBase but I cannot get this to read values from the app.config. Any ideas?

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• C# WinForm Drawing - how to clear and redraw

  - by StoneHeart

  Here is screen shot of my game. On the left is my problem, seem "old draw" still existing. On the right is what it should be. http://img682.imageshack.us/img682/1058/38995989.jpg drawing code Graphics g = e.Graphics; for (int i = 1; i < 27; i += 1) { for (int j = 0; j < 18; j += 1) { ZPoint zp = zpoints[i, j]; if (zp != null) { g.DrawImage(zp.sprite_index, new Point(zp.x, zp.y)); Image arrow; if (zp.sprite_index == spr_green_zpoint) { arrow = spr_green_arrows[zp.image_index]; } else if (zp.sprite_index == spr_red_zpoint) { arrow = spr_red_arrows[zp.image_index]; } else { arrow = spr_grey_arrows[zp.image_index]; } g.DrawImage(arrow, new Point(zp.x - 4, zp.y - 4)); } } } if (latest_p1 != -1 && latest_p2 != -1) { ZPoint zp = zpoints[latest_p1, latest_p2]; if (zp != null) { g.DrawImage(spr_focus, new Point(zp.x - 6, zp.y - 6)); } }

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• anyone research DevExpress' source code ?

  - by MemoryLeak

  I want to study the source code of DevExpress, does anyone have any information about that ? Since I really don't know how to start to read it. if you are also researching the source code of devexpress and you would share it on your blog, then could you please give me your blog link ? EDIT: once you purchase the universal version it will offer you the source for debugging, please refer to https://www.devexpress.com/ClientCenter/Order/default.aspx?group=.NET

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• .NET application for blackberry?

  - by every_answer_gets_a_point

  i have a very simple winform application in vb.net and i was wondering how do i make it work on blackberry and other PDAs?

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• Close box triggers validation for non-modal form

  - by Governor

  I have two form classes inheriting from a common base. One of the forms is called modally and the other non-modally. Validation is required on focus changes but not when the form is cancelled. When the Close Box is selected on the modal form it closes properly without any validation being triggered on it's controls. When the Close Box is selected on the non-modal form, validation events are triggered. A Cancel button with CausesValidation set false works fine in both cases. I have tried setting CausesValidation on the non-modal form to false but the problem remains. I should mention that the forms are mdi children. Any ideas? Thx.

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• MDI Child form over a graphics

  - by Poco

  How to show a MDI child form over a graphics control (created from a Panel's CreateGraphics method, for instance) in a MDI Parent control. The MDI Parent graphics control gets over the MDI Child form.

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• How to add a blank line in the log file using log4net?

  - by Jollian

  I used RollingFileAppender. And I want add a blank line to the log when my program launches. How to do that? Thanks.

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• Recommendations for a Hex Viewer Control for Windows.Forms?

  - by Fred F.

  I need ability to display content in Hex View, like this from WinHex Offset 0 1 2 3 4 5 6 7 8 9 A B C D E F 00000000 EF BB BF 0D 0A 4D 69 63 72 6F 73 6F 66 74 20 56 ..Microsoft V 00000010 69 73 75 61 6C 20 53 74 75 64 69 6F 20 53 6F 6C isual Studio Sol 00000020 75 74 69 6F 6E 20 46 69 6C 65 2C 20 46 6F 72 6D ution File, Form 00000030 61 74 20 56 65 72 73 69 6F 6E 20 31 30 2E 30 30 at Version 10.00 00000040 0D 0A 23 20 56 69 73 75 61 6C 20 53 74 75 64 69 ..# Visual Studi 00000050 6F 20 32 30 30 38 0D 0A 50 72 6F 6A 65 63 74 28 o 2008..Project( 00000060 22 7B 46 31 38 34 42 30 38 46 2D 43 38 31 43 2D "{F184B08F-C81C- 00000070 34 35 46 36 2D 41 35 37 46 2D 35 41 42 44 39 39 45F6-A57F-5ABD99 Please recommend a control. Thank you.

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• When I try to show an image on linklabel click, I get an error

  - by JB

  When I try to show an image on linklabel click, I get an error: unrecognized escape sequence. Code: public void linkLabel1_LinkClicked(object sender, System.Windows.Forms.LinkLabelLinkClickedEventArgs e) { System.Diagnostics.Process.Start( "mspaint~C:\Users\Joshua Banks\Desktop\Downtown_atlanta_night.jpg"); }

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• Control init lag at startup

  - by blez

  I get a small lag at the controls I'm using when I start up my app. Can I show the main form after the controls are drawned?

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• How to make a floating (tooltip) control in Windows.Forms?

  - by Daren Thomas

  The Scene: A (smallish) Form hosting a UserControl. The Plot: Whenever UserControl raises a hover event, display some (graphical) information in a tool tip fashion. When the user moves the mouse, fade them away again. Notes: I'd like to display more than one "tooltip", with each tooltip being a UserControl displaying information in a graphical manner. Not just text in a yellow box! Also, I'm using the Windows.Forms library.

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• What points to be used for Drawing Hexagonal Shaped Button

  - by Durga

  Using below code I am able to draw arrow shaped button(shown below) ,but I want to draw hexagone(shown below as result image) ,so that I can use png image of size 175x154 as button image ,What Points I need to use to draw this ? and i need to to draw 6 such buttons ,how do i achieve this ? private void Parent_Load(object sender, EventArgs e) { // Define the points in the polygonal path. Point[] pts = { new Point( 20, 60), new Point(140, 60), new Point(140, 20), new Point(220, 100), new Point(140, 180), new Point(140, 140), new Point( 20, 140) }; // Make the GraphicsPath. GraphicsPath polygon_path = new GraphicsPath(FillMode.Winding); polygon_path.AddPolygon(pts); // Convert the GraphicsPath into a Region. Region polygon_region = new Region(polygon_path); // Constrain the button to the region. btnExam.Region = polygon_region; // Make the button big enough to hold the whole region. btnExam.SetBounds( btnExam.Location.X, btnExam.Location.Y, pts[3].X + 5, pts[4].Y + 5); }

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• Is there a way to get different sizes of the Windows system icons in .NET?

  - by Andrew Watt

  In particular I'd like to be able to get the small (16 x 16) icons at runtime. I tried this: new Icon(SystemIcons.Error, SystemInformation.SmallIconSize) Which supposedly "attempts to find a version of the icon that matches the requested size", but it's still giving me a 32 x 32 icon. I also tried: Size iconSize = SystemInformation.SmallIconSize; Bitmap bitmap = new Bitmap(iconSize.Width, iconSize.Height); using (Graphics g = Graphics.FromImage(bitmap)) { g.DrawIcon(SystemIcons.Error, new Rectangle(Point.Empty, iconSize)); } But that just scales the 32 x 32 icon down into an ugly 16 x 16. I've considered just pulling icons out of the VS Image Library, but I really want them to vary dynamically with the OS (XP icons on XP, Vista icons on Vista, etc.). I'm willing to P/Invoke if that's what it takes.

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• Access Edit Mode Values of BindingSource Control

  - by Christopher Edwards

  I have a BindingSource control (http://msdn.microsoft.com/en-us/library/system.windows.forms.bindingsource.aspx) with a datasource of a (single) Linq object. If I change any of the properties of the underlying Linq-to-Sql object then all the other changes on the bound controls on the form are lost. Does anyone now why and how I work around it? I don't want to call EndEdit because this will commit the changes to the underlying object. I think this might be because my underlying object linq-to-sql object does not implement IEditableObject so the potental new values for the object fields are sort of stored in the forms controls. Can anyone either clarify what is going on and/or suggest a work around. Thanks!

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• Strongly Typed Controls in .NET

  - by Tigraine

  I am working on a Windows Forms app for quite some time now, and I really find myself doing more typecasts in the GUI code than I ever did in my underlying business code. What I mean becomes apparent if you watch the ComboBox control that accepts some vague "object" as it's item. Then you go off and may display some DisplayMember and a ValueMember and so on. If I want to retrieve that value later I need to typecast my object back to what it was. Like with strings getting the value takes string value = (string)combobox1.SelectedItem; Since there are generics in the Framework for quite some time now, I still wonder why in the Hell not one control from the standard toolbox is generic. I also find myself using the .Tag property on ListViewItems all the time to keep the displayed domain object. But everytime I need to access that object I then need another typecast. Why cant I just create a ComboBox or ListView with items of type ListViewItem Am I missing something here or is this just another example of not perfectly well thought through controls?

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• Resize WinForm, with no border?

  - by Dodi300

  Does anyone know how I can resize a winform when it has no border. I don't want the default border that Windows has, so I changed the property "FormBorderStyle" to "None". This removed the border, although now it can't be resized. I've figured out how to move the form around, I just need to know how to resize it.

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• How to update my database when datagrid delete some rows ?

  - by monkey_boys

  i binding datasource in my datagrid when i remove some rows in datagrid my database not update how?

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• Forcing a checkbox bound to a DataSource to update when it has not been viewed yet.

  - by Scott Chamberlain

  Here is a test framework to show what I am doing: create a new project add a tabbed control on tab 1 put a button on tab 2 put a check box paste this code for its code (use default names for controls) public partial class Form1 : Form { private List<bool> boolList = new List<bool>(); BindingSource bs = new BindingSource(); public Form1() { InitializeComponent(); boolList.Add(false); bs.DataSource = boolList; checkBox1.DataBindings.Add("Checked", bs, ""); this.button1.Click += new System.EventHandler(this.button1_Click); this.checkBox1.CheckedChanged += new System.EventHandler(this.checkBox1_CheckedChanged); } bool updating = false; private void button1_Click(object sender, EventArgs e) { updating = true; boolList[0] = true; bs.ResetBindings(false); Application.DoEvents(); updating = false; } private void checkBox1_CheckedChanged(object sender, EventArgs e) { if (!updating) MessageBox.Show("CheckChanged fired outside of updating"); } } The issue is if you run the program and look at tab 2 then press the button on tab 1 the program works as expected, however if you press the button on tab 1 then look at tab 2 the event for the checkbox will not fire untill you look at tab 2. The reason for this is the controll on tab 2 is not in the "created" state, so its binding to change the checkbox from unchecked to checked does not happen until after the control has been "Created". checkbox1.CreateControl() does not do anything because according to MSDN CreateControl does not create a control handle if the control's Visible property is false. You can either call the CreateHandle method or access the Handle property to create the control's handle regardless of the control's visibility, but in this case, no window handles are created for the control's children. I tried getting the value of Handle(there is no public CreateHandle() for CheckBox) but still the same result. Any suggestions other than have the program quickly flash all of my tabs that have data-bound check boxes when it first loads? EDIT-- per Jaxidian's suggestion I created a new class public class newcheckbox : CheckBox { public new void CreateHandle() { base.CreateHandle(); } } I call CreateHandle() right after updating = true same results as before.

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