I have a Winform running and a timer (winform) firing each 3 min to make a transmition of data..I'm ok about the UI stoping for a while, the problems is that the timer fires two times in every interval, even if I use Timer.Stop. It seems that the stop instruction is not stoping the timer asso...more >>

How can I enable/disable Main Menu Item on MDI Parent Form when a Child form is loaded? Is it possible? In one child form i the code below on the button click event. The first line of code has error. I also dunno why may be it is not possible to instantiate the parent form while it is ...more >>

I''ve got a datagrid on a windows form that I'm formatting using a custom table style. Within the code that sets the style up I have tsName.ColumnHeadersVisible=false.. but they are still displaying. Any ideas why that might be? Thanks ...more >>

Hi everybody, I have a little problem, no two. First my english is not quiet good so please try to understand what I want and help me, please ;) And second: I habe a Form. In this form is a ScrollableControl (modified, so it could raise scroll events), containing another Control painting a...more >>

Hi, in a .Net 1.1 WinForms application I have a dialog that lets the user set new network credentials. Question: How can I assign the new credentials - say nc, defined by Dim nc = New System.Net.NetworkCredential(M_User, M_Password, M_Domain) - to the running (VB.Net -) application, s...more >>

I have a windows form that contains a datagrid with columns given coloured backgrounds via the DataGridColoredTextBoxColumn class. Data is loaded, and the table style set up, during the load event of the form. At present, the form half displays, then pauses, then completes. Is there any way of...more >>

I have an app (that should really be a service, but I haven't got round to it yet) that just monitors a network folder via a filesystemwatcher for new files and then does its thing. Generally, it works fine, but it fails about once a month - which is about one every 2-3 hundred files. No error ...more >>

Has anyone done any research (or even just any ideas) on the best colour scheme to use for forms? I don't like the default grey background.... but is it the best? Thoughts? ...more >>

Hi everyone, I have what I think are 2 pretty simple questions. I know I have done it before, but can't remember how I did it. #1: I have a windows form with a textbox. The textbox is getting filled from within a function. I need to have the scroll buttons on the text box accessable at ...more >>

I would like to only fire SelectedIndexChanged if the an item is directly selected. example: I have a listbox with a few items in it. These items only half fill the listbox. If I click in the listbox, but not directly on an item (that is in the bottom half of the listbox), the bottom item is...more >>

I have a non-UI assembly that contains a Form similar to the MSN Messenger pop-up that appears when a user comes online. I have a Timer in this assembly that on regular intervals goes and looks for new information and if it finds any, displays the Form to the user right above the System Tray. ...more >>

Is there any way to preload a form in VB.NET of how can I avoid seeing when a form is loading, how it is painting all the controls it contains? I think in VB6 I could use Load(frmTest) and after it is loaded, show it. Thanks ...more >>

I have my own windows form with some contrlos to set a few parameters. I show this form by frm.ShowDialog(). How I have to proram the button which sometimes should close form but in another time, the buuton should give a messagebox (with warning message: "Some parameters are incorect") and not ...more >>

When a textbox/text area/dropdownlist is disabled, the font is grayed out. Can I change the default color of disabled control to black? I tried to override Disable/Enable property of textbox and set 'ReadyOnly' instead of diabling the control. It works for textbox only because dropdown lis...more >>

I have a Winform running and a timer (winform) firing each 3 min to make a transmition of data..I'm ok about the UI stoping for a while, the problems is that the timer fires two times in every interval, even if I use time.Stop. It seems that the stop instruction is not stoping the timer assoc...more >>

Hi guys. I am writing an aplication with C#.Net in VS.Net2003 I have a Mdi form wich has 2 child forms. How can I set one of the child forms as a topmost ?. When I set TopMost property to true it does not work. I tried every thing but nothing helps. Can anyone send me an example of code. ...more >>

Hi: I have a set of derived forms that I wish to implement an 'Execute' method to launch these forms, but I also wish to hide the 2 inbuilt ShowDialog methods so these can't be called unwittingly. I have tried: private new DialogResult ShowDialog() { } private new DialogResult ShowDial...more >>

I am working on an application created by another person. And I am confused with the default value of the dateTimePicker. One dateTimePicker always set the value to the current date/time in property window. (actually no value is set by look at the generated code) But another one had the val...more >>

I had build an installer project for my ASP.NET project. And found that several fields need to be configured, like the web.config files and etc, which requires user input. Also I need to attach my database using the installer project, anybody could suggest how I could perform similar action? ...more >>

Does Anyone know how to get the Windows user and group names? Thanks. ...more >>

I am having a strange problem with a textbox that I am dynamically adding to a form. What I am currently doing ------------------------- I have a set of questions defined in a database. Each question can have a variable number of possible responses and can be laid out differently. I have ...more >>

Hello! We developped a .NET Application, which includes some Reports. We created a Setup Projects, including the CR merge modules, specifing there our CR licence key. Now we have the problem that we need to deploy this application on computers where the users do not have the right to modif...more >>

Hello, I am using a DataGrid control to populate an all customers list. I would like the users to be able to scroll up or down the list press Enter and the customer record populate on another form. I am able to accomplish this only with the Click Event, and it only works if you Click the...more >>

C# - Windows application. Datagrid class... Data grid is populated with records. (see the code below) Select one of the entire row from the grid (selected gfrom outside left boundary). The row gets highlighted... Press CTRL C to mimic copy functionality. boom!!! unhandled exception...more >>

Yeah, reading the subject, it makes no sense...but here goes.. I made a textbox control w/ some added features...the problem is, whenever I go to use it, I forget what my custom properties do. Is there a way to put helptext into the custom properties so it appears in the bottom of the prop...more >>

Hi, I have two datagrids (on the same Windows form) that are basically two different filters of the same datatable. I've set up a table style for the first one and I'm then trying to reuse that same style for the second datagrid. That's giving the error "Cannot add a DataGridTableStyle alrea...more >>

hi Can window controls be loaded from a html page which could be hosted on a linux machine? the client m/c will be running windows pls provide me links if any thanks in advance -- Ganesan.B ...more >>

I am developing a windows application for scrolling through multi page tif documents (similar to ms word style). I am having difficulties achieving a highly smooth scrolling affect. I load the entire tif into a memory stream and access it from there. I am using a picturebox like control to vie...more >>

How to open cash drawer through receipt printer in c#?...more >>

Hi all. I'm having problems preventing the delete of datagrid rows when they are selected via keyboard selection. I have implemented the common solution of overriding of PreProcessMessage() to prevent delete when the user selects the entire row by selecting the row header. This works fine...more >>

Not sure if this is the proper group for this but... First, I am trying to figure out exactly what steps I must take on each client machine to be able to Run a .Net WinForms ap from a local Intranet mapped drive. Currently my app will only run if it is installed to a local hard drive. Not...more >>

I have a BaseForm with a tab control that has two tab pages on it. When I create a DerivedForm based on the BaseForm I am able to add pages to the form in the DerivedForm. I am also able to reorder all of the pages on the tab control in design mode, however, as soon as I compile to run, the reo...more >>

There is a small group of doing .net development in c#/VB.net. I noticed each of us is logging/ catching errors differently in our programs. In short, does anybody know of a class or object out that that will allow us to add to each project to have common logging/error handling to access through ...more >>

I am trying to load an assembly dynamically in a windows form application and bind to one of the interfaces contained in it. I can successfully load the assembly into memory and create the object which is a Form. But how do I bind to an interface the Form has implemented with out making a pr...more >>

I have an app that minimizes itself to the system tray. It's also single instance; when a second instance is started, it just activates the first one and quits. When the first instance isn't in the system tray, I can use ShowWindowAsync() via interop to bring it to the front. When it's mini...more >>

Hi All, I am testing some stuff out at the moment with the runtime generation of classes relating to schema-validated XML elements. I was hoping to get to the point that I could include the use of the DefaultValueAttribute on any property that requires it. The PropertyGrid was then to be u...more >>

I am attempting encryption. I start with a byte array of some dimension and end with a padded byte array with junk on the end. Is there a clever way to remove padding from the end of a byte array? Thanks, Fred Herring...more >>

I have an application that is capturing grayscale images from a frame grabber (about 10 frames per second). The 1024 X 768 pixels are then copied to the bitmapData section of a bitmap ( a background processing thread) and then displayed by the UI thread. The basic structure of the code is t...more >>

Does anyone have any C# code snippet for iterating thro a datagrids rows and getting the values of the rows that have been selected ...more >>

Hi, I'm looking for which event to use with regard to a DateTimePicker control. I want my event to fire when the actual contents of the control is changed... but I'm finding that all events are firing when I, for example, scroll from month to month. Presumably I'm missing something very stra...more >>

I am writing a control which extends System.Windows.Forms.TextBox and adds in the concept of EditMode vs. ReadyMode (similar to an Excel cell). So normally when focus arrives on the control, I hide the blinking cursor and change the mouse pointer from an I-beam to an arrow. When the user hit...more >>

I have adatagrid and a dataset, when i bind dataset to grid, it works fine, however when i use formatting(Tablestyle, Columnstyles), then the formatting doesnt work. The data is still binded without showing the formatting. What canI do to resolve this problem? ...more >>

i currently have a dataview bound to my datagrid and would like to add some navigation. i already have a mouseup event that highlights a row when the user clicks a cell. i am looking for a way to highlight the previous or next row depending on if the user hits the up or down arrow keys. i'v...more >>

Hi, I've a problem with setting the selectednode in a treeview. When a user clicks a node on the tree, I save the data for the previous node, and store the newnode in a variable in the Mouse up event. Then I reuild the tree, and set the SelectedNode to the newnode. I can see that the sele...more >>

I am using context menus as pull-down menus, activated by buttons. If a context menu is already open I want the corresponding button to close the menu instead. Is there an easy way to determine wether a context menu is 'open'? regards, Teis ...more >>

We are experiencing a problem when trying to run an application using no touch deployment. All works fine on our W2K workstations but failes to run when browsing from IE on a Win2K server with framework 1.1, IE 6.0.28. On the server running the application like this works: "C:\WINNT\Micros...more >>

Hello, I have a tree view that shows check boxes on its nodes. Is there a way to turn off the check boxes for some of the nodes, and not all of the nodes? I see there is a check-box property for the TreeNode object in the Win32 API, but it's not exposed in the .NET API. Thanks -- Ja...more >>

Appearantly a ContextMenu doesn't fire its Popup event when invoking a menu item with a shortcut. This kind of makes the Popup event useless for enabling or disabling menu items (if you're using shortcuts)!? Example: Suppose you have two menu items in a context menu and that they have th...more >>

I am building a Windows Form App that has a splitter in the client area, treeview on the left, and panels on the right. Different classes of tree nodes need different views. How can I cause the one I want to work on (say add or remove a control) to pop to the top of the z order in the design vie...more >>

hello if there are several child forms are opened in their mdi parent.how can i move the one of the child forms to the front end to show in the CODE?? thank you!!! ...more >>

I have a business object which has a property bound to textbox: txt.DataBindings.Add(new Binding("Text", obj, "MyProp")); Object property set method for MyProp is something like: set { if (...) throw(new ApplicationException("error message")); else _myProp = value; } The pr...more >>

A colleague of mine previously made the following post in this newsgroup, but it hasn't received any MS attention. We were reminded that we should register our nospam alias with the .Net Passport that is linked to our MSDN licenses, and it was reposted with that nospam alias, but it still hasn...more >>

Hi, I needed this for my current project and thought it might be useful to someone else. It's a simple Disposable class that preserves a RichTextBox's selection, used like this: // using (new SteadySelection(rtb)) // { // rtb.SelectAll(); // rtb.SelectionColor = Color.Red; // } B...more >>

Hi, I have a tabcontrol that has a tabpage, I want to add another tabpage on runtime, but I want the tabpage to be added to the 1st tab, anyone know how to do it? Thanks, Tee ...more >>

I am trying to create a control which is basically a PictureBox than can receive and show focus. I have created a UserControl descendant that simply contains a PictureBox control. The PictureBox control automatically sizes to whatever size is selected for the control. To show focus, I am overrid...more >>

Hi Can anyone point me to a resource for common used (or not so common) icons / button graphics?? Thanks ...more >>

I was wondering if there is a way I can add an extra header to a datagrid? I found this solution on the internet - but it seems quite old and didn't work for me. http://www.dotnet247.com/247reference/msgs/13/69744.aspx It recommends the following: Private Sub DataGrid1_PreRender(ByVal ...more >>

I have an application which uses the PropertyGrid to display highly-customised dynamic data using ICustomTypeDescriptor. I need to be able to display the properties within categories with the order of both the categories and properties being programmable. I can control the order of properti...more >>

Hi, I'm trying to 'hide' the main form of an application until all the layout work is done and all the controls have their final sizes and locations (once the form is displayed you can see the several toolbars, panels and docking sections being resized, drawn for the first time, etc, and ...more >>

Hi, I'm working on a VB app that links in to our personnel db to control holiday requests. The idea is that a user can go into the app, enter some dates that they want holiday for, with that then passed to their manager for approval. My original thinking was that the request would generate a...more >>

I monitor the KeyDown event for an edit field on my Winform. I am capturing the Enter key (in case someone presses it it needs to act like a tab). This works most of the time, but there is some sequence happening within my code in other places that makes it so that the 'Enter' key is not capt...more >>

If you pull changes from a dataset and send the changes to update method of a data adapter, when you merge the changes back to the original dataset you may end up adding duplicate rows. This happens when the PK is updated either because a row is being added and the PK is an Identity column or...more >>

Hi! I need to bring focus to ...more >>

Hi, i have vb.net windows forms applciation. i make a loop in order to do some work that consumes time, and i want the user to be able to press the stop button in the middle, problem is that no events are received while in the loop. in VB6 we had the DoEvents command that did the job. what i...more >>

I pass my label control by reference into a function in order to change = the font color. If the value in the label is a negative number, I will = change the color to red like this; lbl.Font =3D New System.Drawing.Font("Microsoft Sans Serif", 8.25!) lbl.Font =3D New System.Drawing.Font(lbl.Fon...more >>