Answer Questions

• jeevankumar Does using(IDisposable) induce boxing?

  If I have a value type Foo: struct Foo : IDisposable {     void Dispose() {}; }   And I place an instance of Foo in a using block: Foo bar = new Foo(); using (bar) {     ... }   My understanding is that bar.Dispose() will be called at the end of the using block. My question is, does this induce boxing Since Foo is a value type, and IDisposable is not, will the C# compiler cast bar to type IDi ...Show All

• SimonTeW A common application for recursion

  Hi, A common application for recursion is the problem of generating all possible permutations of a set of symbols. For the se consisting of symbols A,B and C there exists six permutations - namely, ABC, ACB, BAC, BCA, CBA and CAB. The set of permutations of N symbols is generated by taking each symbol in turn and prefixing it to all the permutations which result from the remaining N-1 symbols. It is therefore, possible to specify the perm ...Show All

• KillerBoy C# project always rebuild if Xml Documentation is set

  Under Visual Studio 2005 Beta 2, I noticed that the C# projets are always rebuild if the option to generate xml documentation is set (and this make all the projects that depend on the project to always rebuild aswell) . The following steps can create the problem I'm talking about: 1) Create a new "Class Library" C# project 2) Build it. It should build it (i.e. you see in the output "csc.exe ..."). 3) Build it again. It should not build it (ie. ...Show All

• Macktr cast

  how to you cast from string to object this code below is not right. Can you please help private object XMLcount( string msg, string title, string defaultresponse) { string items; items = Microsoft.VisualBasic. Interaction .InputBox(msg, title, defaultresponse, 129, 148); return object (items); } Every class and struct are of the type Object, so you never have to cast a clas ...Show All

• TrevorT determine if running in IE

  hello, Is there some way for a C# dll to determine if it's running in IE, and, if so, redirect the page This is using the v1.1 Framework. I cannot speak to being able to control IE from your control as I have zero knowledge or experience with even attempting such a thing. Worse yet I’ve been unable to find any good documentation on how to do such a thing, nor on how to have the User Control interact with ...Show All

• sjphere rtf to image

  Hi, i need to transform the contents of a richtextbox (rtf) to an image. Any suggestions will be highly appreciated Thank you Peter Ritchie wrote: You could try raising the OnPrint event, passing a Graphics object that is associated with an image. Something like (aircode, not compiled or tested) Bitmap bitmap = new Bitmap(100, 100); // change size to suite needs using(Graphics graphics = Graphics.FromIm ...Show All

• Nate Stewart Error Installing and Running C# Beta 2

  Whenever I install C# Express Beta 2, I get an error message during the install process of C# Express (An error has occurred would you like to send an error report). The installation continues just fine. When I open C# after the installation completes, I can go to file > new project, but the templates listing is empty. If I try to open an old .sln or .csproj, I get another error message and C# crashes. Here is a list of the things I've tri ...Show All

• Ralph Deleja-Hotko What's the difference between += and =+?

  Is there a difference between the valid += and the mysterious =+ They both compile, is this correct You got it backwards, += is the valid expression. =+ is the oddity. I'm just trying to figure out what the other's purpose is. n += 1 (n = n + 1) n =+ 1 ( )   Tom Meschter wrote: There is no =+ operator in C#; n =+ 1 will be understood by the compiler as n = +1. The ...Show All

• Vaiduks tlbimp.exe and DllImport

  I have a dll file that also comes with a .tlb file.   When I tried to load the dll file, I imported the dll using tlbimp tool.  The dll implemented an interface that exposes some functions... but when i tried to create an instance of the class in my dll file, it throws me : System.Runtime.InteropServices.COMException was unhandled   Message="Retrieving the COM class factory for component with CLSID {9A85C592-4736- ...Show All

• Blessy How do I multiply a number by pi

  Hey, I'm currently programming a calculator application and I have found myself stuck on multiplying a number by the mathmatical value of PI.  The number shall be inputted in to a textbox1 and the result shall be shown in textbox2.  Does anyone have a solution to this All replys are appreciated regards Liam Thanks a lot Justin that worked just fine. try System.Math.PI that should help. I am also having problems showi ...Show All

• Dayan_07 the dismatching error with "unsafe"

  i need to use the native code(unmanaged code),and i have to use void*,so i use the "unsafe" symbol then i meet the trouble c++code: SC_InitAsk sca; memset(&sca, 0, sizeof(sca)); sca.m_Head.m_nType = SC_INIT; sca.m_dwSoftware = 0x12345678; sca.m_hWnd = m_hWnd; m_Dll.SCInit(&sca, sizeof(sca) c# code: unsafe { SC_InitAsk sca = new SC_InitAsk(); sca.m_Head.m_lIndex = PublicValue.SC_INIT; sca.m_dwSoftware = 0x12345678 ...Show All

• qtvali Cannot add parameters to delegate.BeginInvoke : delegates parameters count mismatch

  Hi, I have some trouble understanding why my code doesnt work the way I want. Clicking on a button launches a call to a thread for sending mails: // the delegate to the method sending mails delegate void mailingEntry(); //button clicked: go to the mail processing.... myMailerDel = new mailingEntry(sendBCCLoop); myMailerDel.BeginInvoke(null, null); the fonction sendBCCLoop updates a progress bar while sending mails... As I first have to go back t ...Show All

• dalenewman Error Help please!

  Hello and thank you for taking the time to read this, I'am building an application for a hyperthetical club and I've come accross an error that does not make sense well sort of but I do not see the way around it. In the code below I've placed: /////////////////////// ERROR Accures Here! where it normally jumps out of the code. I have a class with setters & getters as well, but I dont think it is the problem... Ive added data to the array an ...Show All

• pato135 Access to private variables with object of same type.

  I've been working with C# for sometime and this may have been asked and answered many times but I am unable to find the answer anywhere. I've never done this before in code till just today and realized something didn't make sense. Why can I access private variables of same object types but different objects inside the class definition The following explains what I am referring to. using System; namespace ObjectTest { public c ...Show All

• perri Detection of thread executing

  I have read up some on utilizing threads, being a newbie to programming in C# and converted a major function in my application to execute in a background thread (to stop the display from freezing up if I switched to another application). The threading worked perfectly and it even terminates itself after completion. The only complication I have is that I cannot update the various text boxes on my form because they are part of other system thre ...Show All