I am designing a new Windows Forms client application (with SQL Server db on the back end) for which users will authenticate via NT authentication (network), or SQL Server authentication. Users who are granted access to the application must also be granted access to specific forms and controls...more >>

Hi, I am trying to display the processes running on my system to a listbox. but i got 'DisplayMember' is not a member of 'System.Windows.Forms.ListView'. during debug. any clues? below is the code Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handl...more >>

Hi, I have added some buttons and boxes on the VB.net form. After deleting these buttons and boxes from the form, I find that the code is still there. Does VB.net have a feature to clean up these unwanted codes? thanks ...more >>

Does anybody know how to get the blinking to stop. When I hover over the ToolStripStatusLabel sometimes it blinks and sometimes it doesn't. So the tooltips seem to behave inconsistently. The blinking is very annoying and makes the tooltip unreadable. And what does AutoToolTip property do. ...more >>

Hi, I am at the early stages of defining the technology requirements for a graphical, 2D Windows Forms application with display features along the lines of MS Visio. It has a requirement to display it's data in a number of tree or network like formations. The "workspace" will take up the...more >>

Hi, I would like to data bind two different forms with each other. I would like to have employees on the first form and orders on the second. When the selected employee changes, the orders should change two. It is easy to do on a single form where you can add a new bindsource which points t...more >>

Hi, I am at the early stages of defining the technology requirements for a graphical, 2D Windows Forms application with display features along the lines of MS Visio. It has a requirement to display it's data in a number of tree or network like formations. The "workspace" will take up th...more >>

Hi There, Hope everyone is well? Im after a sample Application where the front screen looks like the Outlook 2002 or 2003 screen, ie with the Frames etc.I would like this to be free if Poss. Anybody got any Ideas? Many Thanks Si ...more >>

I've created a project data source based on an interface that in turn derives from another interface. When in Visual Studio Data Sources view I examine the properties exposed by the data source, I see only those properties in the derived interface and none from the base interface. A data so...more >>

I have project where I need multiple forms using a common menu structure (like a web solution but with WinForms). Is there a best way to do it? I'm currently trying inherited forms, but I'm not sure that's the best way as it seems to present challenges....more >>

I have a form with labels that can be dragged and dropped onto different regions of the form either individually or in groups. I signify labels which have been selected by toggling the BorderStyle between FixedSingle and Fixed3D. Upon a single click the toggle occurs. Upon a double click I di...more >>

Maybe this is normal, but as I type in the code file, the designer tab shows the little asterisk indicating the file has changed in the designer as well. Normally this wouldn't bother me, but in my case the designer files (including the .licx and resx) are also tagged as changed and get check...more >>

I have set a datasource to a combo box. COmbo box style is drop down list. I am trying to set it's selcted index to 0 at run time bit it is throwing following error : An unhandled exception of type 'System.OutOfMemoryException' occurred in system.windows.forms.dll Additional information:...more >>

How to get the month or day of datetimepicker e.g if day 1 it show 1, i want it to be 01 Moveover, can i change the datetimepicker into three combo box, one is day, month, and year?...more >>

In a Windows Form, I have a set of detail controls bound to a table in a dataset through a BindingSource. I cannot figure out how to tell if the user has edited any data in the controls that needs to be saved to the database. The EndEdit method will force any changes to update back to th...more >>

I have a stack trace of a NullReferenceException and the only code in the stack trace is from System.Window.Forms. System.NullReferenceException: Object reference not set to an instance of an object. at System.Windows.Forms.UnsafeNativeMethods.CallWindowProc(IntPtr wndProc, IntPtr hWnd, In...more >>

Hi EveryOne, What is the best approach for data access while developing applications using Windows Forms ? Is it opening, working with and closing a new SQLconnection and SQLcommand object everytime a DB access is needed , or maintaining a single open connection/command object at the applic...more >>

Is there any performance issues using remoting. Kim ...more >>

Hi, I found .NET.1.1 quick starts for WinForm quite useful. It is being hosted at the following link: <http://samples.gotdotnet.com/quickstart/doc/default.aspx> Do we have .NET 2.0 Windows Forms quick start hosted somewhere? Thank you, Alan ...more >>

Hi, Can I have a ComboBox with multiple column list with header? We have such capability in Microsoft Access forms where we can bind a ComboBox's list to a query and show multiple column and column header. I am looking for similar feature is .NET WinForms. Any help would be appre...more >>

I have an app with two forms which are displayed at the same time. When either of these opens a modal child form both are disabled intil the modal child is closed. Is there a way to prevent this from happening? I believe I need to create two independent message threads but I have no idea how...more >>

Hello, Many application these days have the settings form - where the left side is a tree listing all the available settings which can be edited. The right displays the relevant form when an option in the tree is selected. This is a really basic question - so apologies. But how do you stac...more >>

Hi all. I created a windows application and used No Touch Deployment to deploy it on the web server. On the web server there is a virtual folder, which points to Release folder of my application. When I run it for the first time, everything is correct. But when I change version of my applic...more >>

"Use of Ole1 services requiring DDE windows is disabled" I get this error whn I drag files out of my window with the "create link" mode (hold alt key). When I copy or move the file there are no problems. How do I prevent the error? How do I enable "Ole1 services" or how do I make my window...more >>

I want to add some checkbox, combobox into the datagridview, how to do that moreover how to add validation into datagridview?...more >>

Hi, I have a problem trying to localize an inherited form using VS2003. I have inherited a form from a non-localized base form in a third-party assembly. Since all controls in the base form is protected there's no problem changing for example the Text property of inherited Label controls in th...more >>

My app uses an MDI interface. However, one of the design requirements is that the MDI children don't actually behave like MDI forms, in that the small toolbar containing the MDI minimize/maximize/close buttons is not shown when an MDI child is opened in its parent. Also, the MDI children sho...more >>

Hi there, I have problem when i try to change current cell of DataGridView by my program. In dot net version 1.1 i'm using DataGrid and there is DataGrid.CurrentCell = new DataGridCell(1,1); But i didn't find a way how to do this with DataGridView. I just want when it's neessary to make my cure...more >>

I am using VS 2005 (C#) and I am considering using Visual Inheritance. I have heard about some problems with it, such as controls dissapearing and would like to know from people who have experience with Visual Inheritance what do they have to say about it. Any ideas, suggestions, concerns, t...more >>

.... just testing ... ...more >>

I plan to write a Windows Forms MDI application for a medical office. Users must be able to select a patient and view related information on multiple forms; with1-4 forms opened at the same time for the same patient; each form showing a different type of patient-related information. After v...more >>

I need to some how add a page to a tabcontrol. The problem is I have a single method to bring up the dialog which contains the tabcontrol and doesn't return until the dialog is closed and I don't have any events for it. The only thing I can think of is to start a thread before calling that ...more >>

After Fill method, CurrentRow.Index is 0, but I need that some other Row is CurrentRow. How? Thanks ...more >>

I'm running VS2005 Team Arch. and winfx beta 2. I have a c# project windows application so I assume this is the right this is the correct forum rather than a vista forum. I added a windows form to the project and double clicked on it. It opened the code window and added the Load event. I...more >>

Hello, Let's say I am creating a class library project. This class that I am creating will work for a windows form project and also a asp.net project. How can I store something in the "ViewState" collection in a class library project? Thanks, Mark ...more >>

Hi, Just create a label as follows. label1.Text = "labelW"; label1.TextAlign = ContentAlignment.MiddleRight; label1.Font = new Font(label1.Font, label1.Font.Bold); When this code is executed, the last letter 'W' gets cut off. OS is Windows XP, graphics driver used is intel extreme graphics ...more >>

Hi, Is there any way to have location property's X or Y greater than 32767. Thanks in advance, Regards, Swat ...more >>

Hi everybody, I have an application that minimizes to a NotifyIcon. Occationally I get this error: System.NullReferenceException: Object reference not set to an instance of an object. at System.Windows.Forms.NotifyIcon.UpdateIcon(Boolean showIconInTray) at System.Windows.Forms.Not...more >>

Sorry I didn't made it clear. I hook onto the Leave event of the panel and in there I check wheather another control will receive focus. I hope that makes sense. ...more >>

Hi, We are having different opinions how to name controls in our SmartClient application. Is there any best practice guide how to name UI controls? Should we change the default names that IDE assigns to labels and panels which we never refer to them in our code? It would be greately he...more >>

Hello, I have panel containing textboxes, I don't mind textboxes losing focus BUT I need to ensure the panel does not lose the focus until I am ready. How can I do this. Thank you in advance for your help. ...more >>

Hello, i have a custom collection implementing IList. this collection holds custom objects. my binding object is the collection. i implemented the PropertyChanged events in my custom object. example: txtMyControl.DataBindings.Add("Text", myCustomCollection, "MyPropertyName"); the probl...more >>

am using a TreeView control. I want to do some operations on the control i.e. adding/removing nodes etc. Is it possible to somehow lock the tree control so that it won't update itself after every operation, so that when all operations are done then only update once. Thanks in advance KD...more >>

I am trying to embed an Office Document in a VS 2005 Windows Application which I can edit and save. The only documentation I can find uses a COM component Webbrowser control. I would like to avoid using this and use the new .NET 2.0 Webbrowser control but I can't figure out how to communicat...more >>

I'm developing a Add-On based WinForms app. The "Host" application is a basic shell of an application that loads modules that implement the actual functionality. OK, so that is out of the way. :) When the host app starts, I wanted to have an HTML "start" page displaying the different pro...more >>

I am using 2003 .NET and have a simple form that when encounters an error it will bring up the MessageBox to display the error. I want that message box to pop up over the calling form, but it always pops up in middle of my screen. My understanding of the documenation implies that this can b...more >>

Hi all - I am somewhat new to winforms and my question should be kind of basicbut I have been unable to find the solution thus far. I have a VB.net app that requires a user to login; the idea is to open the app with toolbars disabled - the user clicks on a "login button" and a login dialo...more >>

Hi, I'm using delegates successfully in a Windows Application project. As soon as I try the same code in a Class Library project, I get an error. Here is the simple code: Form1 Public Delegate Sub LabelWriter(ByVal txt As String) Public Sub WriteLabel(ByVal txt As String) ...more >>

Basically: How to do it?...more >>

Is there a way to determine whether the user is running the WindowsXP theme, or the old Grey/Silver windows one. [what I'm actually trying to do determine the background color of a text-box when it is disabled :) If anyone knows how to do that as well, it'd be super useful!] Thanks ever...more >>

Hi, In an application I need to develop a transparent window's form with opaque title bar. The transparency of the form can be achieved easily with TransparencyKey attribute but in this case the title bar, which is also a part of the form, becomes transparent too. Can anyone please give me ...more >>

Hello, I noticed very strange behavior while setting Site property of Control, and I don't know how to solve that problem. here goes the stroy: I have written my custom control - assume its type is C - and some class which implements IComponent and IContainer - that container is going to contai...more >>

I've got a DataGridView with a combo box in one of the columns. As it stands, the user has to click the dropdown button twice - once to focus the cell, and again to drop down the list. I can't find any property to change this behaviour, the EditingControlShowing event doesn't fire until they ...more >>

Hi, I am developing Windows Forms/C# application under VS 2003. Some dialogs have wrong icons. I can easily replace the icon to another one using dialog's "Icon" property, but what I really want is to remove the icon from the dialog altogether. I tried to delete the Icon property value. It w...more >>

Hello, My question is: how to add mapped disk to FullTrust zone? I think that is the reason my program doesn't start from network location. Jaro...more >>

Does anyone know a method to retrieve a reference to the datagridview column that contains given client coordinates? Essentially I am trying to implement drag and drop functionality from a listbox to a datagridview. In this case I am using an item dragged from the listbox into the datagr...more >>

I am selected the text in a textbox using SelectAll. It does select all but does not give the reverse video effect that you get if you select the text using the keyboard. Is there a trick to make this happen. many thanks Rod ...more >>

I am adding a checkbox to a datagrid in the normal way (see below), but I end up with a tri-state checkbox. I only want a bi-state one and I can not see how to arrange this. Many thanks rod ------ Dim myCol As DataGridColumnStyle myCol = New DataGridBoolColumn myDataGridStyle.Gri...more >>

Hi, I have a VB.Net solution with 5 projects, 4 of the projects are control libraries and the 5th is a forms application that displays the controls. If I open the form into the designer, the solution will fail to run (it pops up the build error warning box), but if I remove the form from t...more >>

Hello, I am creating a print document and it works well, but how do I make the print object only print pages 1, 2, 5? This is how I am currently building the print function. Private WithEvents docToPrint As New Printing.PrintDocument Private Sub Button1_Click .... ..PrintDocumentPages(i...more >>

Searching the net to get a way to draw transparent labels like in VB6 with background picture boxes i found some messages and here is a little routine wich will save some time this routine will draw all labels with transparent background... enjoy : 1) Create a PictureBox with an image, name i...more >>

Hi I have a form with a listview on it. When an item is selected it causes other controls on the form to be filled with data related to that item. If the data is dirty then i want to check that with the user using a cancel/yes/no message box before filling the detail control with the data of ...more >>

I have an application that needs to be able to run in both english & Hebrew. (Regardless of the culture set in the windows Control Panel). So I set CurrentThread.CurrentCulture & CurrentThread.CurrentUICulture to the cutlure I want at the beginning of the program. Then I found, To my suprise th...more >>