Hi everyone, I am developing a WinForms application and I need a Math Expression validator, not an expression evaluator. So I want to be able to say... if ((sales - tax) > 20) THEN (x * y * 0.55) without knowing at runtime what the values of sales, tax, x and y are. Is there any softwa...more >>

Hello all, since i wanted to use ssl and its seems easy to do so with this object. Im trying to login to a webserver (aol) for this example. But for some reason, im packet sniffing with ethreal and cookies are not being sent along with the header and post data. here is the code im using. C...more >>

Hi, I have code such as: Form01 f1 = new Form01(); where Form01 is a form in my project. then I have Form02 f2 = new Form02(); etc. I have 50 forms. Can I use Form f = new Form(); and then assign FormXX to f? It must be simple, but I can't find how to assign one of my 50 forms to my ...more >>

The issue: I have a grid which has a dataset as the datasource. If a user enters data in a textbox on the grid and then clicks on the close button of the form (the red X in the upper right corner), no events fire for the grid or the control that the user was typing in. The closing event o...more >>

How do I reference one of the properties of a form control within a SQL Command of a DataAdapter? Do I have to do this dynamically within code or can it be done within the CommandText property editor? ...more >>

Hello All, I would like to have the progress bar look smooth not add the little progress boxes when you change the value? how about a custom image as the progress bar? regards Jay ...more >>

I have implemented a C# class inherited from System.MarshalByRefObject and using RegisterWellKnownServiceType to allow a web app to communicate with a service on the same machine. I would like to limit remoting of this class to the same machine (i.e. I do NOT want external machines connecti...more >>

Hello Is there a C# string method or short algorithm equivalent to CString SpanExcluding? ...more >>

I'm embarking on a project that will have both a desktop application and a Pocket PC application. It seems logical to have as much code as possible sitting in a shared project, which would be referenced and utilized by both the Windows Forms application and the Mobile Device application. A...more >>

Hi there, I load an excel file from an asp.net page and try to read it into a dataset. The problem is that it tells me: Database or object is read-only It only needs to be read only. Here is the code. Could someone please advice me what I am doing wrong. Thank you Chris (FileExcel is the inpu...more >>

I'm hoping someone can provide me with an idea how to approach this problem I have. I am writing a test utility that runs multiple tests. While looping through and executing each test it is possible that one of the conditions requires the system to reboot. I want to be able to pick up my te...more >>

What is the C# equivalent of VB.NET's Exit Sub? Thanks, Brett ...more >>

In my attempt to make a macro recording program where i can then playback mouse movements i'm running into a big problem: I'm trying to simulate the movement of the mouse to a point on the screen. With my current code the mouse is only moving in the X direction and not in the Y direction (...more >>

I'm trying to remove specific lines from text files. I need to always remove lines 1 thru 8 and lines 10 and 11 from text files. Seems like a simple task, but I'm not getting it. I'm reading the file via webresponse as a stream and then trying to remove the lines before parsing it and the...more >>

This may be a dumb question. Bear with me because I'm a driver guy. Anyway, I would like to put text, and/or HTML, and/or a hyperlink into a TextBox type of object. Any clues on how to use a TextBox object or browser object to accomplish this would be very much appreciated. Thanks ...more >>

1. How does one allow the user to sort by clicking the column header of a datagrid? 2. How does one put an image (.gif file) in all the cells in a column of a datagrid?...more >>

How would I get the current username using C# in an .ASPX web-app? I tried System.Security.Principal.WindowsIdentity.GetCurrent().Name and this returns 'NT AUTHORITY\SYSTEM' I also tried System.Environment.UserName which just returns 'SYSTEM' What am I missing, or what should I do to ge...more >>

I have been trying to run this program called mysqlbinlog.exe from my main c# application using the Process class(See example below). The way that mysqlbinlog functions is to read the first file in the command line and pipe the results to the second file. This works fine when actually run from...more >>

Let's say some one makes the argument that instead of multi threading an application, they say it's better just to make multiple applications. The app does the same thing for different modules. The modules are conceptually the same. They contain mostly data but some processing to get data. ...more >>

Hi, I'm working on different projects that each is a class library which is run off of a main application. Can I change the output path of just the compiled DLL file to the path of the main applicatin for testing. I'm getting very tired of copying that file to the main directory after each ...more >>

Hi! I am using a datagrid wherein one of the columns should show an image (.gif file). Every row should show the same image. When the user clicks the image, certain data from the row is passed to another webform via Response.Redirect( ). How do I place the image in the column and what type ...more >>

Hi there, I made a custom drawn ComboBox. The DrawItem event handler is (explanation follows) <code> private void OnDrawItem ( object sender, System.Windows.Forms.DrawItemEventArgs e ) { ComboBox theCombo = (ComboBox) sender; DataRowView drv = (DataRowView) theCombo.Items[...more >>

For some reason both my VB and VC# are missing project templates the one that I really need to locate at this time is "Class Library project" For some reason I cannot get them to install of off the CD I keep getting errors and it stops. Does anyone know of a place where you can download the...more >>

I realise .NET has all these great objects, specifically strings, but is it really necessary to create a string variable (object) just to compare two string values? For example, I'm looking at an attribute of an XML string, and I wish to compare it's value to a literal string, but it has to...more >>

I have a strange problem with a website and a web service. They're both on the same server, running Windows server 2003. The website is set up as the default website for the server. I've got the same code running in several different environments, it just so happens this is the production...more >>

Okay so now I understand (surprised though) - that WebServices can indeed pass ByRef/ref parameters. All I have to do is mark an integer parameter of a WebMethod as "ref". Funnily enough, this is also supported per the SOAP Spec, and from what I understand, .NET's implementation of WebServices...more >>

Hello, When I try and start my Dot Net service on a windows 2003 sbs server I get a "System error 5"/"Access is denied" message. I can fix it by editing the properties of the service by specifying the administrator account and password but I don't won't my users to have to do that. How c...more >>

Hi There What are the best value practice exam engines for 70-316? How does this strategy sound: * First iteration - Go through Kalani's training guide + MSDN + http://www.codeclinic.com/70-316skills.htm + Any other online resources * Second Iteration - Go through the ExamCram book and ques...more >>

Consider a system that has exe and dlls, how can i ensure that only the authorized .net assembly can work with my system. For example, consider your sys got an exe, that would use dll A, B, and C; how do you ensure, other people cannot create a dll D, that has the same interface, from being in...more >>

Hi, I have a store procedure like this: CREATE PROCEDURE AAA @p1 int @p2 datetime @id int OUTPUT AS SET @id=(SELECT id FROM table1 WHERE p1=@p1 AND p2=@p2) But p1, p2, @p1 and @p2 could be NULL and this is a problem because it can happen something like this: p1=NULL...more >>

Hello, I want to know about "creating new objects without assignment to a reference" like this : ... new Employee("John","Woo"); .... Is this a good programming practice ? How does garbage collector handle this issue ?...more >>

Hi, I have an application which is using a dll written in C++. When the program go to the function below, it would raise an NullReferenceException at the line of PtrToStructure. public bool ServerCallBack(IntPtr log) { DB_T acclog = (DB_T)Marshal.PtrToStructure(log, typeof(DB_T)); } ...more >>

Hi all. I have a question about virtual and override methods. Please forgive the elementary nature! First off, let me quote Programming in the Key of C#: "Any virtual method overridden with 'override' remains a virtual method for further descendent classes." Now here's my question: Let's sa...more >>

I have a dataView and i only want to get the first x rows . Is there a way of doing this without using Foreach? Thanks JB ...more >>

Sorry for all the post on conversion from VB.NET to C#. Just can't figure some of these out. getElementsByTagName method is fine in VB but get this error in C#: Object does not contain a signature for getElementsByTagName Intellisense in both langauges is the same. [VB.NET] Private W...more >>

hi all I need a POP3 source code..I found some sourceon codeproject.com but with some exceptions. thx in advance ...more >>

Which book is recommended for C# , for beginners and advanced , in English ? Thanks in advance , Lior . ...more >>

Hi, Is there any way to check whether user has changed the data in a DataGrid? Thanks, Tee ...more >>

Hi all Is it possible to refer a control by his name programmatically? Example: I have text box and a button on a form txtName btnClick And what I want to do is: myForm.GetControl("txtName").text = "xxx" myForm.GetControl("btnClick").text = "xxx" ...more >>

Hi, Consider following app.config <configuration> <appSettings> <add key="Fields" value="Field1" /> <add key="Fields" value="Field2" /> <add key="Fields" value="Field3" /> </appSettings> </configuration> Is there any way to retrieve all three values for one key. Its ...more >>

I'm not really sure if this is the right place to ask this question, so if this is off-topic, please feel free to redirect me ;-)! Anyhow, I was searching around for a free C# (or .NET in general) profiler and I came back with quite a few hits. None really stood out in particular, so I was...more >>

Hi, I'm interested in figuring out exactly what kind of change to an assembly is binary compatible. I've browsed the doc a fair bit, but I can't find a comprehensive list of what actually constitutes binary compatibility. Could someone point me at an authoritative list? One question in part...more >>

Hi If i have a form application that creates a thread, is there a way to detect from within that thread if i have closed the form ? Now i use the forms closing event to end the thread i started, but i would like to do it automatcally so i do not have to worry about any threads that remain a...more >>

I'm fairly new to programming, that said, I know how to 'program', but my question is about design. How big and what sort of objects should be stored in Session. I'm doing an e-commerce website, and I've created an xsd based around the shopping cart, customers details and the order's tables....more >>

What is the best way to avoid string manipulations with SQL? I have edit box control where database is opened for attacks through SQL commands. Something like this: selectString = "SELECT FIRSTNAME, LASTNAME FROM xxxTable WHERE FIRSTNAME='"+txtTextBox1.Text"'"; Furthermore I would like...more >>

Hi all, I'm looking for information on running a c# application on a webpage, just like a java-applet. And the second thing i'm looking for is information on how to display 3d graphics with c#. And if there are 3d model importers available for it (like milkshape ms3d or something similar)....more >>

Hi, I want to use interfaces, but somehow it doesn't work as I want to. I have these compoents: 1. IClass A component that holds an interface for a class. 2. Class : IClass A component that holds a class that implements the IClass interface. 3. UseClass A component that wants to use C...more >>

Hi, I have a server application (MFC) which communicates through the serial port. I need to have a graphical user interface, in c#, which needs to communicate with the server. At present the user interface is a very dull MFC dialog app which communicates with the server via WM_COPYDATA. H...more >>