Hi, let's suppose I have a class A { int x; ... public static bool operator == (A a1 , A a2) { return (a1.x==a2.x); } } But, outside the class, I have a problem when I try to test a probably not initialized class. For instance, think about this code: public void myFunc() { ...more >>

I have a question about how one of these methods is called. The call theNote.Write(); uses the Write() method in the Document class, and not the Write() from the Note class. Why is this? theNote is a Note type, isn't it? So shouldn't it call the method from the derived class? Or does it have...more >>

I'm trying to figure out how I can get the minumum height required for a textbox containing a string in a given font with a set width and also the converse, the minimum required width of a textbox with a set height. I want a textbox that is resized to fit the text inside with either the hei...more >>

I have been reading alot about local system hooks, and am able to inject a c# built system hook into a thread outside of my app but unsuccessfully, the program crashes(ie: notepad keyboard hook for testing). I assume that you cannot inject a c# built dll into an app other than your own appdomain...more >>

Hi I am "playing" with some simple aspects of C# with Visual Studio. All I would like to know right now is how do I get the Console.Write method to write its output in the Visual Studio debug/output pane? At the moment my application creates a "command" window and writes output there (all b...more >>

Hi, Is there a way to create an event handler on variable and watch for a specified value to occour? Let's say i want a method executed when value of x = 10 and x=15 Thanks ...more >>

I've been out of programming for awhile, so need a bit of info. Are .INI files still the way to save application settings?...more >>

Hello all. The Microsoft documentation for the .NET SDK has the following description for the "StartPosition" property of a Form: public FormStartPosition StartPosition {get; set;} I'm confused about the "FormStartPosition" type. I understand that the StartPosition property is used to ...more >>

I'm building a simple "breakout" style video-game, and I want keyboard control of the paddle. What I need is for an event handler to respond whenever a key is pressed, regardless of what the focus is set to. So far, the best I've been able to accomplish is to create a button and have that b...more >>

Now this is a classic. The impersonation fails for CASE I but doesn't fail for CASE II or III. Case I: Client Side Code ----------------- System.Net.NetworkCredential credential = new System.Net.NetworkCredential("myUserName", "myPassword", "myDomain"); ServiceA a = new ServiceA(); a.Cre...more >>

Hi all, I have a windows form which contains several text boxes. I would like these text boxes to DataBind to records in an Access.mdb. I have connected to the Access.mdb using ADO.Net. When I click on a navigation button, it doesn't matter which navigation button, the text boxes are not ...more >>

How do I send escape codes to the printer I used to be able to do Printer.Print chr$(27) & chr$(71) & "20" and get it to send. Of course this was vb but there should be some method of talking to a printer. thanks, jc ...more >>

Does anyone know where I can find good information on formatting the XML comments in C#? I want to add line breaks, color, spacing, etc.. but I can't find this documented anywhere in MSDN. I am using NDoc to build a help file from the developer studio generated XML file. -- Bill ...more >>

(Type your message here) -------------------------------- From: Zephyr . hey, i got trouble getting integers out of a plain text file. i dont want to use binary files, just plain text files so they can be hand-edited more easily. now, for all i know (still a rookie) there's StreamReade...more >>

Does anyone know why the dataset blows up when it is reading a column that is defined at DateTime and there are null values or empty strings? ...more >>

Basicly im trying to determine when a new line has been appended to the textbox of another application. Using spy++ I see that the msg (wm_user + 97) is being sent, which is the EM_SETTEXTEX msg(combination of wm_settext and em_replacesel). Below are a few lines of code of what im trying to acco...more >>

Hi there, I'm wondering is there any way i can gracefully handly the System.IO.FileNotFound exception. Let me explain my situation. I've got a window forms app. I've exception handlers for AppDomain.CurrentDomain.UnhandledException and for Application.ThreadException and and a try...more >>

hi , i am using c#. how to creat a data grid with using event handler programming. With Regards JJ...more >>

hi, How to get the assembly version from system. regards JJ...more >>

Hi everyone, I want to encrypt and decrypt a message. I'm using RSA encryption/decryption with PRIVATEKEYBLOB, no hash, and everything works fine, ie I can see my plaintext. I notices that cryptEncrypt in cryptoAPI never returns the same ciphertext, can anyone explain me why ? Thanks a lot, ...more >>

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object. Source Error: here is my code: HttpCookie cookie = Request.Cookies["forumuser"]; if(cookie != null) { string sUserId = cookie.Values["Name"].ToString(...more >>

I just stumbled across some code with triplets, but I'm not sure what they are used for. Why not just use ViewState instead? Can anybody enlighten me? Cheers, Mike *** Sent via Developersdex http://www.developersdex.com ***...more >>

I have a simple csharp form with a 'Go' button on it. This event launches a external exe successfully but the form color becomes white and does not repaint while that external program runs, usually about 10 seconds. I tried creating a thread in seperate class to run that process instead on r...more >>

Hi, I've got a problem with calling a unmanged function : function call in the .H file : DWORD _stdcall DoCmdRequest(long lMode, long * plTagType); my definition in C# [DllImport("3964Lib")] internal static extern int DoCmdRequest(long mode, ref long cardType); When i try to excut...more >>

I have some complex (fairly) user controls that I have created. Some of those user controls host other user controls. When I host one of these on a WinForm, I sometimes run into problems where the designer blows up with an "Object Reference Not Set to an Instance of an Object". Sometimes it e...more >>

hi, I'm wondering if anyone else has seen this. I've just built and published a web site on my developer machine, then copied the precompiled web to a staging / test machine. The code runs fine on my machine. On the staging machine I get a compile error: Compiler Error Message: CS0012: The ...more >>

Hello, Could someone please tell me the history of GUI programming for windows. In the early days, we had to write 100s of lines of code to make a simple dialog box. Then along came MFC to simplify things. And now, finally we have visual C#.NET. Is that right? Is there anything else to it? Ca...more >>

When iam including System.Management Namespace and working with it its raising an error : Invalied Namespace. Its working fine on one system and when the same application is being executed on another machine its giving above said prblm. Can i get a sol. for this prblm. ----------------------...more >>

Hi I have a windows form with 3 ListBoxes. m_listBoxUsers – this displays all users from a database. m_listBoxRoles – this displays available roles that can be assigned to users. m_listBoxUserRoles – this displays the role assigned to a selected user. When I select a user in m_listBoxU...more >>

Hi All, My client has following request. I am not sure how to do it. Dynamically from database, we are getting set of images names. Now we want to display them with next and previous buttons. I am able to pull all the information from database and put it in javascript array. Now using two f...more >>

Hi all! I'm trying to write a file transfer application using TCP, but I'm having some problem to connect the client and the server. Sniffing with Ethereal I can see the packets sent from the client: SOURCE = 130.237.15.219 DESTINATION = 130.237.15.224 PROTOCOL = TCP; INFO = 1464 > 11115 ...more >>

Hey I have dtMessages dataTable and there is columnt DateTime, how can I compare dates using DataView ? I need to compare hours more than dates. But the dates are also needed because sometimes 02:00 will be after 23:50 and sometimes before. So I initialize myTime = new DateTime.Now; and I nee...more >>

To all, I am writing a C# application; I've a DataGrid to show and edit data; then I tried to update the updated data by calling ADO_Adapter.update (ADO_DataSet, "TableName"); But it pop up a DBConcurrencyException! Anyone get ideas on how to properly use DataGrids and DataSets together ...more >>

My dotnet windows service, that is sampling data in real time, sits on 1 machine and the SQL server it talks to is likely to be sited on a different pc. The pcs are situated in an environment where there's likely to be power cuts on a regular basis and it's never guaranteed that the client ca...more >>

Is there a way to hide an inherited protected member so that it is no longer accessible nor visible from the inherited classes? The code below makes c1.foo() no longer accessible, but c2.foo is visible to c3! If instead I make c2.foo private, then c3 will access directly c1.foo Thanks, Fab...more >>

What is this error message all about? I cannot find anything about it on the net... it is giving me this error from code i have found on the net that should work but for me i get a load of these errors. If anyone could help it would be great? Thanks Gav ...more >>

Hi, I'm trying to develop a control and want to hide the base class of the control, how do i do that? I want to do something like the follow :- internal class BaseClass { } public class SubClass : BaseClass { } but i get an Inconsistent accessibility error. ...more >>

Hi I have two strings in memory, a XML document and a Schema, I would like a function that takes these two as parameters and returns an errordescription if the XML does not validate and an empty stirng if the XML does validate againsg the schema. What's the easiest way to do this? Kind ...more >>

So, I'm trying to write a web spider for some data gathering from a public database webserver. Anyway, in response to a POST, the webserver returns "200 Script Results Follow" instead of "201 CREATED". While both IE and Firefox ignore the odd header, this response kills my HttpWebRequest w...more >>

Hi, In my project I need to convert rtf to html. Is there any free component? thanks... ...more >>