Hello - 2 questions: 1. I am writing a control which hosts an IE control (AxWebBrowser). As a result of IE being on my control, the control does not get events such as right click, left click, ect when clicking inside IE. What can I do here? 2. If I could determine if I am in "design mode"...more >>

how can i browse and open excel file, show it in Datagrid, then save into databse (SQLserver) (C#) ???...more >>

I have an application that gets all the assemblies in a folder structure. Once I have that list I want to test each assembly to see if it implements a interface I require. This is what I currently have using C#: Assembly a = Assembly.LoadFile( file ); Type test = a.GetType( "InterfaceTest....more >>

Hi all, Does anyone know how to do the windows forms like MSN Messenger (from login to enter the messenger) ? Thanks, ...more >>

All - I am looking for the type of control that shows when you mouse over it and then hides when the mouse out. Like the Toolbox window when you unpush the pushpin. Know where I can find it? Thanks, Brian ...more >>

I am developing a Windows application (Visual Studio .Net)in which I need to view calculated data on a given Windows Form using the Paint method. No problem with that, but how to manage printing of the Form's content when the information is too long for just one page (Letter format)? To print ...more >>

I assume .NET has some standard icons for things like open and closed folders that are used in treeview controls, but where are they? I looked at the explorer.exe resources in Visual Studio to try to capture some icons but none of the icons or bitmaps in that executable seem to match the ones ...more >>

I'd posted months without having a grasp of what the problem really is. The issue is with an Infragistics UltraWinListBar control. It's on a base form, many forms inherit from the base form. The UltraWinListBar controls on the inherited forms seem to want to use their own size information inst...more >>

I create a user control object and show its properties through a propertygrid object in my application. It is sure that there are 100 hundred of properties inherited from System.Windows.Forms.UserControl and they are all showed on the propertygrid. Is there a way i can hide all these inherited...more >>

I'm developing a windows service application using C#.NET and I need to catch the system shutdown event to run service closing process. I override the OnShutDown event but nothing happened when rebooting the system. I also need to catch the same event in the service manager (winsows form appli...more >>

I'm writing an app in vb.net 1.1 and would like to share one common imagelist amongst many forms. Is there a way to do this? Perhaps put the image list in a component and then have each form create an instance of this component. What are some recommendations for this? I know I could put it...more >>

I have what is probably a stupid question, but I have an array of controls based on a custom control I want to allow users to drag and drop from one form (similar to a toolbox) onto the primary form. The custom control has a bitmap and contains text that varies among the array of custom contr...more >>

Hi! I am writing an application that needs to provide a way for users to query a database, by filling out a form of fields and values - i.e. QBE (Query By Example). I'm playing with different ideas as to how to best provide a UI to do this. The main idea I'm working with now is to use the ....more >>

In a datagrid, I can get the cell row/col where the focus was moved to using the CurrentCellChanged event. But I need to find out what row (if any) the focus was in prior to moving - how can I do that? What I'm trying to accomplish with this is to have a button display in a cell, but only on ...more >>

Hi to all, I need to add a dropshadow to a form, how can I do it (vb .net)? I found the syle CS_DROPSHADOW but it requires me to subclass the window (I don't know how to do it). Thanks, marcos ...more >>

I still not understand, at microsoft Example itself, I see this line: Public Sub QueryDataBase() ... -->> Label1.Text = "DataSet Filled" This is not call to UI from another thread. ...more >>

I have build a WinForms app in VB.Net and compiled it into release mode. I see in the Release directory that I have an executable and several resource files. If I move my resource files to some other directory, the ..exe dissappears. When performing an install, do I need to install the exe...more >>

Hi, Anyone knows know can I combine 2 images (gif, jpg, etc) in one image, using VB6 or VB.NET code?? Thanks for your help. Richard...more >>

Hello, I have a form with a label on. The label is aligned to the right side of the form and the label's anchor is set to Bottom, Right. This means that if the label expands (due to the AutoSize property) it should expand to the left. However, this is not done and the result is that the text in t...more >>

When I use Multiple lines Textbox, it always appears with a 1 character padding on the left. How do I remove the 1 character padding? I have already tried TextBox.Text.PadLeft and tried to set some of the properties but it doesn't work at all. The textbox I am using the System.Windows.Forms...more >>

I am not quite sure if this is correct forum to post this but I'll see what response I get. I need to create an app that will connect to an FTP location in VB.NET. I have no experience in doing this hense the email. When I have connected to the ftp site, I have an app that will read throu...more >>

Calling FindForm of UserControl which resides on form returns instance of this form, but when I put this control on TabPage FindForm returns null. How can I get Form on which my usercontrol is on?...more >>

After I upload a file from a windows app to a webserver I'll get HTML message back indicating the uploading successful or having error. I'like to popup a message box to display the HTML response. Could someone tell me how to display HTML text on a message box or a windows form? Thanks, sea...more >>

I have a datatable that I use to display running processes. These running processes are spawned as different threads. I use the readerwriterlock class to ensure that when I write to the datatable, I obtain a write lock. The datagrid is set to have a datasource of the datatable. The problem is...more >>

Hi I have a webservice that retrieves data from a database, this is then returned to the calling client application built in windows forms within a dataset, however upon attempting to create tablestyles to format any of the columns within the datagrid, the exception "Can-not parent objects ...more >>

I am working on a control where I have several exposed properties during Design-Time. When I set the values of the properties they are immediately applied to the variables, and the control updates. Unfortunately, as soon as the control loses focus, and if focus is returned again (or the applic...more >>

We have a dialog containing a treeview on the left displaying groups and a grid on the right, displaying data records belonging to the group. We are using Shift-F2 to view the full details of the record displayed in the grid. We have turned on KeyPreview so that if focus is on the treeview,...more >>

Hi, How do I strike-out some text in a certain cell(line through text)? This would be in C# and a windows form. Thanks....more >>

I read this article: HOW TO: Populate Datagrid on Background Thread with Data Binding by Using Visual http://support.microsoft.com/kb/318604/ I try it, I call from new thread to binding DS to control . And I find out: This code throws exception: DataGrid1.DataSource = Ds DataGrid...more >>

hello! Pls tell me how to set Background image for Toolbar (without setting background for main form). Usually when I set the backgound img for main form, the toolbart automatically setted by this Img, but I don't want the Main form to be setted! Thannks for all helps! ...more >>

This chunk of code are causing me grief. It puts the correct Text Display in a ComboBox on a form depending on what is in the ImgFocus Property of a Custom Control. But it is calling the GET() portion of a property that is undesired. Any Idead? Dim index As Integer index = cmbSoftFocus....more >>

Hi, how can I create an instance (object) of a class (form) if I only know the classname (VB.NET 1.0)? I need to do this in a complex app where jobs consist of parts. Each part's data is saved in a separate database table. For the parts, the form's class name is saved in a data table, so that...more >>

hi I have a drop-down list (combobox) bound to a dataset, on a windows form, I want the displayed strings in the list to be sorted. so I have set ds.defaultview.sort="field name" however this does not work. Can somebody throw some light on this behaviour? warm regards ...more >>

Hi, I have a control on a form. A richtextbox. During user activity I do a richtextbox.append("here is the text") statement. How do I get the richtextbox to scroll automatically so the most recently appended line of text is shown without the user having to manually scroll down. This wou...more >>

Hello I have a windows form that I would like to float on top of another form so I set the TopMost property as follows: m_F_WorkHistory.TopMost = True But when I try to inertact with the calling form, the m_F_WorkHistory form disappears. The form is to be used to help fill out the ...more >>

Hi, I have a number of buttons on a form. I do not want any button to be selected by default. Seems like .Net selects the button which has the lowest tabindex ordinal by default. Any way around this? THx....more >>

I have created a large MDI app that just stops working at random times, often when focus leaves the app, then comes back, but it can happen anytime. The Main form is still there and everything, when it is in this state, but the main form's title bar and the mdi child form's titile bar are grayed ...more >>

Dear All, I frequently get a NullReferenceException in my application. The workflow in this case is that it happens only the first time when I drop-down a combo box and select a value...how do I track this error and find what is null in the messageloop...will adding IMessageFilter and using ...more >>

I have a form that contains a wrapper class for a TcpConnection that is to be used as an MDI Child form. Sometimes, when this form is closed from the main form, it will throw a System.NullReferenceException in the default Dispose override method (provided by the form designer). protected o...more >>

Dear all, I have a question on C# Winform on the Setup Project. The question is, I want to change the default path of the destination folder for the setup project instead of 'DefaultLocation' -> [ProgramFilesFolder]\[ProductName]. Change to, for example, "C:\MyDocument\ProductName", can i...more >>

Hi everyone, I need your expertise. VB 6 allowed you to place a place holder on a toolbar and then place another control like a text box on the place holder. VB .Net does not have placeholders but I need to have that functionality. Can anyone help please!!! Your assistance is highly...more >>

Hi All, I need to create reports which may take long time. I want to give the customer "Cancel" button with progress bar at building data. I tried to use System.Threading.ThreadPool.QueueUserWorkItem, but application freezes after creating report. Please help! Thanks in advance. Davi...more >>

Hi, folks. I've been searching the 'net for a while, and I'm not finding what I want, so I thought I'd ask for some help here. Perhaps I'm looking at this wrong. I'm developing an application, and the goal is to get an Outlook-style app. So I've been searching through Outlook, seeing everyth...more >>

I have few reports which i need to distribute to a lot of clients and I have following requirements on the clients: - preview reports - print reports - count the number of printed pages (if the report is printed), this is absolutely necessary functionality because clients are charged by the ...more >>

I get "object reference not set to an instance of an object" exception thrown at seemingly random places in my app. This stack trace doesn't show where this ties back to my code. Can someone point me in the right direction? Also, what exactly is a Parking Window? at System.Windows.Forms...more >>

I'm trying to create a custom listbox control that can fire events before the selected item changes in the list box and let subscribers prevent the changes. I'm using SetWindowLong() to set a new message pump function to the listbox using the GWL_WNDPROC constant and a delegate to my C# message...more >>

Hi, I need help on how to check and wait if an async .... DownloadDelegate download = new DownloadDelegate(DownloadFile); IAsyncResult aResult = download.BeginInvoke(null, null); // start download asynch. aResult.AsyncWaitHandle.WaitOne(); // wait for download completes download.EndInvoke(...more >>

Can someone please tell me what event gets fired when the x in the top RH corner of a Windows Form gets clicked. I've spent about a day trying to find this information to no avail. I am trying to trap the event to allow the user to confirm that they wish to exit the application. TIA...more >>

I have a form containing a TreeView control in which I've overriden the OnResize and WndProc functions and added a PaintEventHandler. One thing I want to do is use DrawReversibleLine for 'rubberbanding' lines connecting specific nodes with other controls on the form. DrawReversibleLine expec...more >>

Hi -- I have a very simple question, the answer of which has eluded me for quite some time: How can I draw at the topmost layer of forms and controls from .NET (or from unmanaged code, that would be fine too)?? Any GDI+ drawing I've done only appears on the background of the form/control/wh...more >>

(Type your message here) Hi, I want to make user control transparent. I have made it tarnsparent using maketransparent method but while moving that control its taking background of parent control which i dont want so how can i make this?? Please help me ASAP. my email id is vrushalid@gmail.c...more >>

Hallo=2E I have two panels docked on the right of the form (p1 on the left= and p2 on the right) and I want third panel to slide from right= to left into a view between p1 and p2 (Just like Solution= Explorer window in Visual Studio ? if it is in auto hide mode= its slides to left when mous...more >>

Dear Sir or Madam: I can't for the life of me get the GiveFeedback event to fire during drag-and-drop operations. I am using VS.Net 2003 on WinXP SP2. I have attached a sample application that reproduces the problem. Anyone know what I am doing wrong? Thanks, Dave begin 666 Give...more >>

I have a parent-child datagrid working fine with three datasets connected. My question is how to make it open to the first level automatically. Right now when the form opens it just shows a blank datagrid with a plus sign. I click the plus sign and then it shows me all three levels to choose from...more >>

Hello, BACKGROUND: ============== I've created a Windows User Control that contains an Image Control (among other controls). The user control handles the picture resize event. Whenever the parent that holds my user control is resized, I resize my image so that it uses the maximum avai...more >>

Hi all, I've a a child table in a DataGrid (System.Windows.Forms). I'd like to make the cells of the foreign key column to show the user which values he can enter in that field (those contained in the parent table). I've read the following paragraph in the framework documentation: ms-h...more >>

Hi, Do you know of a component for VB .NET that allows me to create animated (flash) charts? I found some of them, but they are only for ASP .NET, instead I'd like to create some charts in VB .NET that will be shown on a large screen to public (so they need to be very eye-appealing). Thanks...more >>

Hello everybody - I'm working on a WinForms project (MSDev 2003, C#, .NET 1.1) and every now and then I get the following error message when I try to build it: "Cannot copy assembly abc to file C:\...\abc.dll'. The process cannot access the file because it is being used by another proce...more >>

Hello, I am writing an app in vb.net and bind 4 combobox controls to the same table in the same dataset. What happens is that when I change the selection in any of the 4 comboboxes, *all* off the comboboxes change to the same selection. I have in no way coded it to do this! Can someone plea...more >>

Hi. I'm looking for a way to programmatically find and access at run-time any controls that are placed on the "component tray" area on a form (such as ImageLists). The Form.Controls collection is of no use as it does not contain any controls that are not placed on the form itself. Gerr...more >>

Hi there, I've inherited a winform application written in vb.net which I have to fix up and add functionality to. I'm at a bit of a loss looking through it and was wondering if anyone had any advice or could point me towards any resources to do with refactoring/reengineering this vb.net ap...more >>

Hi everyone, I have a strange and difficult to debug situation: I have developed and deployed an IE hosted Windows Forms UserControl as part of my company's web portal, and for just about all of our clients everything has worked well. But for one client who is running XP SP2 and has the .N...more >>

I am looking for an example showing how to encrypt/decrypt a byte array in vb.net. I can examples dealing with strings but I would like to deal directly with the byte array if possible. Thanks, Fred...more >>

Hi there, We have a DataSet with one datatable with three columns and multiple rows. [Each rows has a unique key] 1st Column : Unique Key 2nd Column : Value to Change 3rd Column : Value to Change Based on some conditions I want to update the values of the 2nd and 3rd column but want t...more >>

What is the ligthest (uses few resources) MS operating System in ordert to install .NET (obvious not is XP) ? ...more >>

I'm curious: has anyone ever created an alternative for Windows Forms? Maybe a more lightweight GUI library that replaces Windows Forms for the .NET Framework?...more >>

Hi, I'm struggling to find a way to make a single object databindable, i.e. show up as a possible data source in the databindings dropdown in design time. I have been able to create something that's close, by implementing ITypedList and IListSource, but what I really need is to be able to...more >>

It seems inelegant to get a UserControl with Child Controls to display a tooltip. According to the documentation you just set ToolTip.ShowAlways = true; ms-help://MS.VSCC.2003/MS.MSDNQTR.2003FEB.1033/cpref/html/frlrfSystemWindowsFormsToolTipClassShowAlwaysTopic.htm This feature is also use...more >>

Hi, Has anyone implemented a threadsafe UserControl or Form wrapper? I want to provide an easy way of calling in to a windows forms control from a worker thread without having to declare loads of delegates in the worker thread. Regards ...more >>

when the string collection editor gets invoked it opens up a dialog which has the caption "String Collection Editor", for e.g. as in the Lines property for a TextBox. Is it possible to change the caption to something else other than the default one. I know we can create our own CustomUIType ed...more >>

There's something very strange in my windows application. I created a derived class from DataGridTextBoxColumn to show pictures on a column of the datagrid control. Everything seems fine except that the paint event of the derived class is never executed (no matter where the breakpoint is put)...more >>

Hi all! I want to design a Toolbar with too this feature: - Some buttons are on the most left edge and some other buttons are on the most right edge! How to do it? Wait for your helps! Thanks! ...more >>

Greetings and salutations... I'm using the ISynchronizeInvoke interface to call events on a userinterface from a worker thread. But after i installed .net framework 1.1 sp1, one of the events (with a delegate like this: public delegate void FigureReceivedHandler(Stream figure); now thorws t...more >>

I'm trying to create a custom control that contains both a combobox and a timer. Any ideas how I can accomplish this? I do know how to create a 'one control' inheritance control, but when I add the timer, it compiles but I don't get its functionality - and it's not ticking, as I want it to. ...more >>

I have a UIManager object that sets properties on various UI objects when certain events happen in the application (my events, not standard events). Objects can register and unregister for these events. If I wish to enable a menu item (but do not want expose it as a property) from the UIManage...more >>

Hi, I have a List of objects that I would like to display in a DataGrid. The problem is I don't want to display all of the public accessors, only a few. However, the default for seems to be for the DataGrid to display everything. I am unable to assign the DataSource in the designer, I gues...more >>

I have a Winform application that is always running. If this application is to be revised I need to shut down the current version, install the new version, and the start the new version. Is there a recommended approach for the installer to request a shutdown and for the executing program t...more >>

I have a VB windows forms app that generally works fine. Just occasionally though users are getting an error message (I still haven't managed to get any of them to behave themselves and make a note of it) and then the datagrid on the form is replaced with a red cross. I've tried lots of testin...more >>

Hi, I have an outstanding issue with my control which I would like help with if anybody can help, thanks. I need to control the size of my UserControl which is embedded within Internet Explorer pages. My control is able to determine minimum and maximum sizes (based on sizes and positions...more >>

I am showing a MDI Child Form. That form has a validation by logged user. So that if an invalid user wants to open the forma message is displayed and the form is closed. But the problem that i cannot use the close() method neither on the Load nor the Activate Event. How can I solve it? ...more >>

hi there: I have a win from that set then set the FormBorderStyle property to None.My question is how to resize windows form at run time. -- Jiangyh http://bbqb.com/bbs/index.php ...more >>

my form has a main menu, a datagrid, a set of controls displaying one record of data, and a set of control buttons corresponding the menuitems in the main menu, and maybe some context menus too. my question is, user A belongs to group A, user B belongs to group B. how do i manage the versions ...more >>

Hi there - I hope someone can help with this problem.... A colleague and myself are trying to load a PictureControl (using C#) from a GIF file. We don't want to set the file in the resource properties, as the file is generated on the fly, and placingthe filename in the properties appears to em...more >>

Hello, Does anyone have any examples on how I could show the contents of the TreeView in a PrintPreview window. I've looked at the PrintPreviewDialog control but could not see how I could link the TreeView control to it. I'm assumming I've got to print the pages myself. Thanks,...more >>