Hi, I'm using an Excel-file generated by a third-party application as input to my C# app. The problem occurs in one of the worksheets in that Excel-file, where there is a single column and no column name, so that the data starts in the second row. I'm connecting to the Excel-file as an...more >>

whats the difference between || and | (OR) && and &(AND)? ...more >>

Hi, I just bought this book from Apress (John Kanalakis) I'm trying to put together a .Net project for chapter 2. However, I got stucked with the DataAccess project. Does anyone already had a chance to put it together? Thanks, José ...more >>

Hello I have the following: Dim myBitmap As New Bitmap(600, 500) Q: How to convert a Bitmap to a Buffer() of Bytes Thanks for your help ...more >>

I have an application that need to launch acrobat reader. But before I open acrobat reader, I want to check there is any existing acrobat reader opening and kill them first. What can I do? Can anyone kindly sugguest some idea? Thanks *** Sent via Developersdex http://www.developersdex.com...more >>

Greetings - I have a very simple program: ===================================== using System; class Class1 { static void Main(string[] args) { object o = 0; // o is now System.Int32 type try { uint n = (uint)o; // generates invalid cast exception } catch( E...more >>

Hi, Currently I'm attempting to use the functionality of the FolderBrowserDialog class in my application so that a user can browser and select directories however the class is not being recognized. I have installed .NET framework version 1.1 and I attempt to reference the object using t...more >>

At Vb6, we can do the following, and then call typing SendUsingMethod, it will pop up SendUsingPickup and SendUsingPort option Public Enum eEDMSMailSendUsing SendUsingPickup = 1 SendUsingPort = 2 End Enum Public Sub SendUsingMethod(ByVal eSendUsingMethod As eEDMSMailSendUsing) ......more >>

Hello How can I check if a string is empty? Thanks ...more >>

Hi, Could anyone help me with this error. I received this error "Invalid Parameter" with this code fragment. private void GetPicEmp(long IDNo) { byte[] b = TCSys.GetPicEmp(IDNo); if(b.Length > 0) { MemoryStream stream = new MemoryStream(b,true); stream.Write(b, 0, b.Length); ...more >>

I've an application I've been working on for some time which has a Windows Forms User interface, a set of 'business object' classes and interacts with a SQL Server database and some Legacy COM Objects. All was working well until I added some Logging code. The Logging code raises an Event fro...more >>

I want to know what's the equivalent of COM dll at .NET platform? I want to build a .NET component and will be reused by other .NET application. [-> Add Reference -> .NET] Any links/sample code to teach this? Thanks! ...more >>

Hi, Am extremely sorry, but I couldn't find a right group for this one. I have a C# program which uses the Messaging component and I try to insert a message into a public queue in my machine when I get a message saying "The Quese is not registered in the DS". I see that it is the ADS it is rep...more >>

Hi all, If there is an exception inside the finally part of the try block, then the original exception will be lost. Other than making sure the finally code does not throw any exceptions and/or putting a try-catch (and ignore exceptions) block around the code in finally, is there any better ...more >>

Does anyone know how to do a "Clear Screen" (i.e. cls) with a C# Console Application?...more >>

I am working with SharePoint 2003. I am using an existing webpart as a child control (server control). I need to access/manipulate the HTML that the control outputs prior to rendering it to the the page. The control outputs a list in a one-column table format. I need to access the contents o...more >>

How can i asign permissions for an existing group to a particular folder only (so that no one else besides the group account member could read, write or delete the files contained in the selected folder) programatically with c# or by command line using a .bat ?? regards Marcelo López Infoc...more >>

I don't understand the difference between these three things... Can someone clarify? ...more >>

In my code, class A instanciates classes B and C. I would like class B to connect an event handler to a method in class A, and for class C to disconnect that event handler. I think I've done too much thinking, and now I'm even more confused as to how to accomplish this as when I started. ...more >>

How can I do this in one line foreach((string answer in myansList) && (string qKey in qKeyList)) { //do something } Thanks ...more >>

hello how I can use messagebox as windows application in web application . Thanks ...more >>

Hi, Very simple question (I hope...)- Can I create a C# application that will run *without* having to deploy the .Net framework on the chosen machine? Despite excessive Googling of the web and Usenet, I can't get a definitive answer to this; it seems reasonably clear that it isn't possible u...more >>

I have an interface called IStatus. I have 2 classes, PurchaseOrder and Invoice. They each have an accessor named Status that return an object of type IStatus. I have 4 classes that implement IStatus... InvoiceNote, InvoiceStatus, PurchaseOrderStatus and PurchaseOrderNote. Here's the proble...more >>

Hi, In vb.bet we have Application object that gives us information about application name and path (like Application.ProductName). How can i have Application object functionality in C# ? Thanks, Ali ...more >>

Hello, When using the format program in a command prompt in Windows you get something similar to this: Insert new disk for drive A: and press ENTER when ready... The type of the file system is FAT. Verifying 1.44M 3 percent completed. How can I print out an updating percentage like th...more >>

I have a DataGrid which is bound to a DataSet. Is there any way to take a single cell and change it's font? Or if this isn't possible, could you place a .bmp into the cell? Thanks! Steve...more >>

In my application the fowing call: workSocket.BeginSend(byteData, 0, byteData.Length,0, new AsyncCallback(SendMesCallBack), null); Takes between 156250 and 312500 Ticks . And when like 20 calls are made at a time, they really sum up to something that I did not exspect att all. Why does I ex...more >>

I am trying to programmatically clear the forms and passwords in internet explorer. I am well aware of how to do this (via the UI) in Internet Options and I've already accomplished programmatically clearing the cache and the cookies with the wininet API. Are there any API's that allow me to do this?...more >>

Hi, I have a class that fires an event like this: class MyClass { .... protected override void OnEvent(SomeEventArgs sea) { if (MyEvent!=null) { MyEvent(this,sea); } } } There are several subscriber. I want to be able to notify only selected subsc...more >>

Hi, We used to have preprocessors like #define and #ifdef in C++. How can i have them in C# ? Thanks, Ali ...more >>

Dear Everybody, I want to extract a file from cab files in C#. In visual basic, I used window API-SetupIterateCabinet- to get the file. Do I have to use same way as VB? Thanks, Jongmin ...more >>

Hello, i've a outer function, which takes a params-array as a parameter. I want to pass this array to inner function with a params-array (e. g. string.format). When i've passed an integer to the outer function, the string.format sets the string-value "System.Object[]" at the position of {0}...more >>

Hello group, Trying to get a list of groups, including nested groups, for an account. Anyone see any problem with this code? It is returing a LOT of 122 ERROR_INSUFFICIENT_BUFFER errors. ArrayList alGroups = new ArrayList(); int bufferSize = 1024; int groupLength = bufferSize; ...more >>

I'm doing a CSharp example of a DLL. It has two classes: // Add two numbers using System; namespace MyMethods { public class AddClass { public static long Add(long i, long j) { return(i+j); } } } // Multiply two numbers using System; namespace MyMethods { pub...more >>

Hi, I developed an application on my workstation which is a P4 2.4G. Now that my application is almost finished, I find out that this app will be used on the road by technicians using laptops(gota love inter-office communication). This causes a *major* problem because my app is very UI intens...more >>

Hi I wonder if someone can help with this, because there's something I'm not understanding right. I've got a List Array of PictureBoxes. If I call PictureBoxListArray.Clear(), and then MainForm.Invalidate(), the picture boxes remain visible on the form. I'm not sure why! What's the ...more >>

I have a WindowsForms.DataGrid that I am using to display a datatable. The datagrid is composed of TextBoxColumns. I would like to make the DataGrid have the following behavior. When a user selects a row in the datagrid that row is highlighted and selected regardless of the column. ...more >>

Elo, or other "non server" data base. 4ex. dBase Do U know how to do it??? I've MsVS.NET, i'm tring create OLE Db connection, and recive info that: Invalid property value: ..Net does not support ODBC driver Reg. Darek ...more >>

Hi fellows, According to the C# language specification (10.5.3), Every virtual method has a "most derived implementation" determined by a 3-step rule. If I invoke the virtual method from a normal variable, everything is ok. However if I call it inside a non-virtual method from the base class, t...more >>

Hi, I am looking for a Task Scheduler with source code that has the following features: - Must perform all of the same functions as the Windows Task Scheduler - Must be able to run COM Objects - Must be able to send email and log to the Windows Event Log - A web interface would be a real n...more >>

HELLO, HOW CAN I LOAD A PAGE WHEN I CLÝCK A BUTTON ÝN WEB APPLÝCATÝON C# THANKS ...more >>

I keep hearing this term thrown around. What does it mean in the context of code? Can someone provide a definition and example using concrete code? Thanks....more >>

In order to block using the ALT butto, I use tb.KeyPress += etc and a function containing if(e.KeyChar == (char)56) e.Handled is true; No syntax errors, however, this isn't working. Please comment. Thank you, Patrick. ...more >>

When I was learning Java I found a book that explained Java the syntax and other information about Java, BUT while is was explaining everything about java it also had examples. At the end the examples actually created an actual working program. Is there a book like that for C#, that explains C#, ...more >>

Hi, I have created c# code using wsdl.exe from a wsdl file. But I want to use the functionality from c/c++ code. Is it possible to convert the c# code to COM classes or something similar which can be used from c/c++. thank you vipin...more >>

Hello all, Can anyone explain why I keep getting the following error? C:\Project\CalcServer\CalcServer.cs(4): The type or namespace name 'Http' does not exist in the class or namespace 'System.Runtime.Remoting.Channels' (are you missing an assembly reference?) I have the following usi...more >>

Issue: I have 3 threads, syncing with a ReaderWriterLock (in "real life", there will be more). Thread 1 (there could be any number of these) Gets a read lock with infinite timeout. It runs in a loop. The readlocks are requested and released very often. Thread 2 (only one, this is my dead...more >>

My company is considering using C# for a large project and it is a language I'm only just now becoming familiar with. For the most part I like it and that seems to be the most logical choice as far as future support. My question is: what are the disadvantages or limitations of using C#? So far I...more >>

I have an array list with some values. I need to loop through the arraylist and change the values. I am using the code below and I am getting an error (like you would if i looped through a hashtable). Any ideas why? index = 0; foreach (object val in arrayList) { holeList[index] = (double)...more >>

Hi I need to be able at run time to get the code line - is there a way to do this? Thanks ...more >>

Hi Is there a way to specify where the custom EventLog file will be created? Thanks ...more >>

I need to create a folder in the file system owned by an special user created by my application. The idea is that only my app will have permissions to delete and create files on that folder. My app is a redistribuitable one, so i need to create the user and give permissions to my app to that fol...more >>

All, I have a general design issue that I need some help with. I have a Windows Service that will, on occasion, be sending out email notices. These notices fall into two categories: notices when the service encounters a processing exceptions that it can't handle and notices that it gene...more >>

Could someone give me a clue why I get the following failure when I try to configure an object of this type, using the Data Adapter Configuration Wizard, using a connection to an Access database? Generated SELECT Statement: IErrorInfo.GetDescription failed with E_FAIL(0x80004005). Tha...more >>

Hi, Are there no LostFocus events for web controls? TIA Krishnan ...more >>

I want to write an app in C# that keeps track of when the foreground window in the OS changes. Is there an event that I can "susbscribe" to for this? Or am I stuck polling using the GetForegroundWindow() method? Regards...more >>

H I have developed a com+ component using c# when i am trying to add this com+ component to the Component Service in a windows 2000 advanced server machine, i am getting the following erro "one or more files do not contain components or type libraries. these files cannot be installed can anyo...more >>

H I have developed a com+ component using c# when i am trying to add this com+ component to the Component Service in a windows 2000 advanced server machine, i am getting the following erro "one or more files do not contain components or type libraries. these files cannot be installed can anyo...more >>

I need to add the ability to drag from a Windows Form and drop into a non dotNet application. For example, having a generated image in my app that I wish to drag out into explorer as a friendly way to save it. I have tried creating the object that I place into the DoDragDrop() by inheriting t...more >>

Hello, Can someone tell me what is the best way of implementing the detection of adding a row to a datagrid. I looked at using a DataView as the datasource and the ListChanged event, but that didn't seem to work like I expected. It seemed to fire only when I changed to another row in the grid, n...more >>

Hello, I am needing to pass a class object (this) by reference to a method in a different class. When I do the following code I get the error (Cannot pass '<this>' as a ref or out argument because it is read-only) .. Is there any way to make <this> not read-only? I have simplified the follow...more >>

I have two columns Question Answers Q1 Q2 Q3 Q4 Submit I have the following code to collect the answers and update them in the database but I got the error. I don't know what to do, please tell me if you can Thanks public void updateQuestion(object sender,System.Even...more >>

Hi, The following article describes how to compile CSharp code programmatically http://support.microsoft.com/default.aspx? scid=http://support.microsoft.com:80/support/kb/articles/Q3 04/6/55.asp&NoWebContent=1 When I'm trying to compile CSsharp code (See code below) which includes the "us...more >>

Hi, I am using a toolbar object that has a number of buttons that generally speaking have a corresponding menu item. What I was hoping to be able to do was to write an event handler for the menu item and assign it to the click event of the toolbar button. But I find that the toolbar buttons...more >>

I have a four-sided polygon that rotates and zooms as the user moves the mouse. Is there a way to incorporate a texture-mapped image without DirectX? The GDI+ doesn't seem to support this. -- Myk Quayce "If we can't be free, at least we can be cheap." - Frank Zappa ...more >>

I have a simple C# Winforms application that has an UnhandledException handler that writes to the log. This works fine if I throw a new exception (like"bogus") but it does not gain control on a Zero Divide exception. Is the UnhandledException handler supposed to receive control on all excepti...more >>

Hello, do anythink know, how I can post native Windows-Messages via .NET, how it were possible about the Windows-API with the function PostMessage(Hwnd, Message, WParam, LParam)? Or is it required to import this Windows-API function about DllImport attribute? Thanks in advance, Hubert ...more >>

newbie question. In C++ I could get a pointer to an item in a list, for example int* pInt = &myList[2]; then I could do something like: *pInt = 666; and then myList[2] would equal 666. Nice, very useful and handy. In C# I can't figure out how to accomplish this and I have not accepted ...more >>

Hi, My application writes out files to disk containing representations of shapes, with no problems. I also have an index file written out which stores the shape number and its byte offset in the main file so a specific shape can be retrieved easily. The problem I have is how to delete a...more >>

I installed .NET Framework. I've added the "C:\Winnt\Microsoft.Net\Framework\v1.0.3705" to my Include file. I've rebooted. The only way I can compile C:\Temp\HelloWorld.cs is to be in the above directory. Where I use: csc HeolloWorld.cs and it works. How/Where do I set it so I do NO...more >>

Is this public static method thread safe. //Receives a file name as a parameter //and returns the contents of that file as a string public static string FileToStr(string fileName) { FileStream fStream=null; lock(fStream) //just in case we use it for multithreading to be thread safe { ...more >>

I am making a application that has some UserControls on a tabpage, you are able to drag the UserControl around on the tabpage, you can even select multiple and drag them around also. This is all fine the problem i have is when setting the background image of the tabpage. With small background im...more >>

Hi all , What is a Wrapper Class in c#?? I am new to this OOPS plz explain it thanks in advance regards Suresh Posted Via Usenet.com Premium Usenet Newsgroup Services ---------------------------------------------------------- ** SPEED ** RETENTION ** COMPLETION ** ANONYMITY **...more >>

Hi everyone, I have a general class design question. I come from a VB5-6 background where I made applications that used an active x dll to access the database. In the VB world each class was in a seperate file and I was able to have a module that they all shared that had global variables, like...more >>

I have been trying to get access to the details of a shell link (.LNK shortcut), but no matter what I do I never get the data I need. The basic thought behind the application is to drop a file or shortcut on a form. The form will at a later point execute the program or link. I need to access both th...more >>

Hello My oleDbDataAdapter1 seems to be limited to 99 variables in SQL-statements. At least it does give an error when tying to address more than 99 Does anyboda know if that is a fixed limit or can it be increased?? Thanks for all answers in advance...more >>

I starting to use Visual Studio .NET 2003 creating C# Windows application with SQL Server and I get problem with method Fill() for which when running ends with System Error even with the most simple cases which I copied from a tutorial. everything else works right for ex Preview Data exc...more >>

I tried to create a class which basically acts like union. I have a string and an double member in my class but only one is "active" and I want the use the "implicit" keyword to get the "active" object. Here's the code: public class StringDoubleVal { string strval; double dblval; boo...more >>

Hello, I use the VS .NET 2003. Say I have a Windows form (with C# code, of course) which is connected to a database to one table. I can browse through the records, but I don't know how to accomplish a search for a specific record. I would like to have a button that by clicking it, a response ...more >>

Hi all, Does anyone know how to capture the Windows Keys (I know that they are out of the ascii key range) and how to capture and record Mouse movements? Thanks, /Jonny...more >>

Hi, We try to build dll file with XML file within it (just a XML file, not resource). We succeed to build it in IDE, but we don't know how to do it in command prompt. Can anybody explain what is the correct command? Thanks in advance, Serg Posted Via Usenet.com Premium Usenet Ne...more >>

Hello i am new to C# and am having trouble with variable access.. What I am doing is just making a timer, and within the tick event I want a variable to increase a number.. for example tick event: integervar++; end event however each time I do this, visual studio is telling me that i...more >>

If I open a form in a mdicontainer with an axwebbrowser-control that show=B4s=20 an excel-document=20 and I close the form first and then the application excel leaves open If I close the application without closing the form first=20 excel closes. Help appreciated....more >>

Hello, This is maybe a simple one: Is there any way to check, if a string can be converted to another type (like DateTime or Integer) without using try/catch? In VB, i can use IsDate or IsNumeric to do this, but how can i do it in C#? Thanks in advance, Daniel...more >>

Hello, pictureBox does not have an opacity property so anyone knows how can someone create the same effect on a picture box? Is it possible at all or what? I will then need to inheritate a component from picture box for my purpose but I don't seem to be able to find a way to do this opaci...more >>