Hi I don't even know if this is possible, but I'm trying to open external programs as children in my MDI form. The basic purpose is so I could open notepad, calculator, and other apps in one program that I could minimize and would manage all the programs as children. Is this possible in wi...more >>

I need to find a way to run an external exe (using the process class I assume) and hide. When the process is closed I want my application to reappear. For example, press a button on form1, run notepad and hide form1. Close notepad and form1 reappears. Any ideas? Thanks. ...more >>

I'm currently doing a course in C# programming fundamentals. Please will you check and comment on the following assignment: Assignment: Create a simple calculator prgram that illistrates good OOP practice. I have written the following console program that I hope answers this question (and ...more >>

Suppose a COM object creates a .NET object (call it 'A') through a Com- Callable Wrapper. Can the COM object then pass a .NET reference to 'A' to a different .NET object (call it 'B')? The goal is for 'B' to be able to use 'A' like any other .NET object. This is a much simpler way to a...more >>

Hello Im getting an error when I try to convert like this: string[] arrDSN; objDSN.GetDataSourceList(arrDSN) And the error: Argument '1': cannot convert from 'string[]' to 'ref System.Array' Kind regards ...more >>

How to customize PrintPreviewDialog, such that, addition of a new button, change the functionality of existing button should be possible programatically. Sample code will help a lot. Moreover, what happens before the document gets displayed in PrintPreviewDialog, i.e. whether entire document gets co...more >>

Hello, If I compiled a DLL in C# (csc /t:library mylib.cs); How can I use some Class that loacates in the mylib.dll in another C# program ???? Eric -- ========================== If you know what you are doing, it is not called RESEARCH! ========================== ...more >>

Hey anyone seen this before ? I followed examples from microsoft and added a notifyicon to my windows service project and i can't get the icon to show up. Here is a checklist of what i have tried so far: 1) Tried to make the icon 16x16 2) Made sure the icon was embedded into the exe. 3) Ma...more >>

Hi,=20 How do I dynamically add linkbuttons and wire them to same event? I am = able to add linkbuttons but they do not fire the event. Does anybody = have a working sample? Many thanks, Linda...more >>

Hello: I have a C# app that I'm trying to build. I have three projects in the solution, the first of which stores the base object definitions (base form, base textbox, base commandbutton, etc), the second project holds an intermediate class level (subclassed from the base class stuff), and a...more >>

What's the most efficient way to get the number of occurences of a certain string in another string..for instance i'm using the following code right now... private int CharacterCounter(String text,String Character) { int count = 0; for (int i = 0; i < text.Length; i++) { if(text....more >>

I have three buttons in the toolbar; Bold, Italic, and Underline. When Bold and Italic are pressed, I want the selection font to be Bold and Italic. I chose this code, but it doesn't work My Code if(buttonbold.Pushed == true & buttonitalic.Pushed == true & buttonunderline.Pushed == false {new...more >>

I have been developing a suite of assemblies over the past couple of weeks, and this afternoon somethign started misbehaving. If I do not run the IDE and compiler the code from the command line, the compilation seems to work properly almost all of the time. More on this later. If I launch o...more >>

Hi, I've got the name of a control (mycontrol3) in string format string cotrolname = "mycontrol3"; how can I access to the control instead of doing this mycontrol3.Height = 100; I'd like to do some thing like this (but in the right way) cotrolname.Height = 100; thanks alex ...more >>

How to manage FindWindow() function working properly in ASP.NET application? In Windows Forms application it works fine. But in ASP.NET it returns NULL :( Probalby this is because of different context. Something like IIS is ran under other account or some services cannot interact with desktop. ...more >>

Let's say we log exceptions to the windows application event log using the Exception Management Application Block. Is there a pattern that can be used so the exception is logged only once and not everytime up through the call chain? Is there anything a caller can key off of to check to see if...more >>

I have been doing this with VB.Net for quite a while and NO problems. I tried doing the same thingwith csharp and my Visual DataAdapter bomb when I go back to the page. My code is as follows: string strCRMUpdate = ini.ReadString("CRMCredentials", "CRMUpdate", ""); string strDefaultDB =...more >>

Hello I am currently building a small application that uses an Access Database as the backend to store it's data. Currently I have only one EXE that starts the application, what I wanted to know is that there are any resources or info that any one can provide that can help me to maybe break up th...more >>

I create and start several threads, each thread executes the same method - within the method, a web service is invoked. I find that the more threads I use, the longer it takes for all of the threads to finish. The threads are asynchronous, correct? And I thought each would be able to use it's o...more >>

Greetings: It turned out that using COM objects from .NET C# isn't straight forward at all. Now, I have successfully used reflection to instantiate the object, and invoked the methods and properties through Type.InvokeMember, but... One property whose value I retrieve through : TImagingObj...more >>

Hello all, This is my situation. I'm reading an XML file with a variable number of nodes. So far, all of the code has been reasonably easy, but now I'm up against a wall trying to figure out the best way to proceed. Upon reading in a valid node, I'm wanting to add a tabpage to a tab control...more >>

Hi, I have a dataset containing one table with plenty of rows (>5000). I need to convert these to fit into another set of rows in the quickest possible way. I know what fields I will be getting in, and what fields need to be converted to make the output dataset, but am tryingto find the qui...more >>

I am writing a process that is a tight loop that consumes alot of cpu. Back in my VB days I could use "DoEvents" to periodically yield control to the OS incase there were any pending events. This would keep the app from being able to effectively take over the system. What is the equivilant in C#?...more >>

I want the initial directory of my save file dialog to be the My Documents folder. I know that that can vary, so is there a class that contains these special folder? What I would like is OpenFileDialog.InitialDirectory = Class.MyDocuments...more >>

Hello gurus, I need to dynamically create event handlers for my dynamically created radio buttons in an aspx.cs page. The event should be fired when a user select the radio button. I set the "autoposback" property to true for the buttons that need to fire events when they are selecte...more >>

I have a OOP problem with the well known pattern where objects containing an object which represents a list of subobjects. Now my problem is that the ctor of a subobject indirectly calls the property in Foo which returns the BarList, since to this time the ctor of BarList did not returned yet, th...more >>

I am puzzled. I have this object that uses a thread. The thread is encapsulated by the object, the object has Start and Stop methods to enable the client to start or stop the thread. I found that the object will not be garbage collected while the thread is running. Fair enough, the document...more >>

I'm working on a C# Windows Forms application that is leaking memory. I've been using the SciTech NetMem Profiler 2 (A really great tool, BTW) to track down leaks. I've found one related to ToolTips that I've been unable to fix. We have a base form, from which we add and remove panels. When c...more >>

Hi, This question has been asked b4 on these newsgroups. I can't find a clear example. I have a byte array called signature. I'd like to store this byte array in a SQL server varbinary column and then read it back again. I have the following code snippet: Assumptions: sqlCon is a vali...more >>

The array in the debugger shows that it has [0]----value "xxxx" type string I want to get to the string. When I do Array.GetValue(i).ToString(); I get the value However when I do String str; str = Array.GetValue(i) It tells me type object cannot be converted to string ...more >>

just installed, computer restarted, and now in c# when I write using System; using System.Drawing; using System.Windows.Forms; using System.IO; using Microsoft.DirectX; .... The type or namespace name 'DirectX' does not exist in the class or namespace 'Microsoft' (are you missi...more >>

Hi. I would like to have a blank place with points every X pixels, where it would be possible to draw/place components. A little bit like the GUI of VS. I have to be able to draw a circle or wire between components. Do you know anything that could be used for it? Thanks. ...more >>

He I have netframework installed on my system. I created a folder "test" on my C:\ drive. I have a file named "Hello.cs" saved in that directory "C:\test" . Please let me know how to compile this Hello.cs file. I am new to C#. Thanks Fayyaz ...more >>

I'm new to C#, and I want to use a trackbar for the forms opacity This is my code decimal trans = trackBar1.Value / 5000 this.Opacity = trans When I try to build it, I get this error Cannot implicitly convert type 'decimal' to 'double I tried making trans a double, but then the control doe...more >>

Hi, Does there has any easy way to check if a specified url is a valid one = (both the format should be valid but also the specified path / file is = available)? Thanks in advance! Henry...more >>

Hi friends, I am new on C#. I want learn usefull C# sources on the web. What is your favourite web pages? And how can I search newsgroup posts on the web? ...more >>

I have Type System.Object and the value is {System.Array} I see [0].......[100] in the watch window. How do I traverse such a data structure. thanks for any help....more >>

I have a library that reads web page and returns it like a string. I use "WebRequest" class to get text of page from "https://..." URI. I set credentials and proxy. Everything works fine and page can be downloaded when I use my library in console application. But... When I use my library in...more >>

I want to create about 4 forms with the same dimensions and background colours, similar to the forms one has to traverse when installing various software packages. I'm using Visual Studio and C++ (changing to C# soon) and can create separate forms, but I really just want to clone the first ...more >>

Hello, There's some confusion about the purpose and difference between these handy classes... First, both of them are holding number of key - value pairs, right? Then, I see that there may be some difference in terms of data types allowed for keys and values, perhaps? I read the followin...more >>

Hello All, While reading a C# textbook, I came across this term called "Funclet" I am just wondering what exactly is a funclet. Thanks for your help in advance. regards, Abhishek....more >>

what's tyhe difference between rebuilding a project and building a project in visual studio .Net 2003? ...more >>

Hello: I have two child forms fChild1 and fChild2, and I want to set and reactivate fChild2 over fChild1 when fChild1 is activated. I have tried with this code in frmChild1, but it doesn't work, and now I dont't have any idea about how to do it. Can anybody help me, please? Thanks in advance ...more >>

Hi, i need to know in my code where is the windows folder in c# any ideas? Thanks in advance ...more >>

Hi i need to generate a random string , can anybody give me an example of how to do it in c# thanks! ...more >>

hi i have 2 classes A1 and A2 implementing a problem with 2 different ways i also have 2 other classes X1 and X2 implementing an other problem i need classes that provide A1+X1 methods, A1+X2, A2+X1 and A2+X2: interface A class A1 implements A class A2 implements A interface X cl...more >>

Hi. I have a problem inheriting PictureBox for Compact Framework. I use my class that inherits PictureBox and then when I use my class as control, set all needed properties like Image, Size, Location the picture did not appears when I run the application. I get white screen. When I debug , I s...more >>

Hi, can someone please tell me what is the industry standard tool for developing C# class diagrams? Also, what are peoples favourite UML design tool? Thanks in advance Mark ...more >>

I have to add a property to an object that is already allive. The problem is that I'm creating MainMenu from a definition file ... enyway , there is a need to add each menu item some extra informations. I used to do that using Tag property of an objects but ManuItem doesn't have anything like t...more >>

Hi there, I've a strange problem with ado.net and an Access db. I need to create a little C# app that take the content of "ole object" field and then save it into a file. The problem is that when I do the following Byte[] byteBLOBData = new Byte[0]; byteBLOBData = (Byte[])(ds.Tables["tb...more >>

Hi to all... Thanks for the help... I want to get the value of the column of dataset into array, but I get this bug. "Cannot apply indexing with [] to an expression of type 'object'" when biuld. The code I used to populate the array is: ColumnNo = from 0 TO count of columns. AllCol...more >>

Dear Readers, I have successfully created a C# program that will load records from a view, do some processing, write them back. I want to do this in an unattended mode. I want to close the program once the processing of the 500-odd records are done. private void frmGeoCode_Load(object s...more >>

Hi, I've read "Cybertof"'s thread (04/19/04) & the article he provided in a link about accessing UI elements from a thread that did not create them. What the authors are saying makes plenty of sense. However, using the control's Invoke method handles calling it's methods, but what about access...more >>

I'm trying to copy data from a 1D array to a 2D array. The obvious thing doesn't work: int[,] twoDee = new int[2,2]; int[] oneDee = new int[2] { 1, 2 }; Array.Copy(oneDee, 2, twoDee, 2, 2); This causes a RankException. But the MSDN documentation says: When copying between multid...more >>

I have an app that allows for cross process eventing. I have a server that instantiates a shared object that external processes can remotely get a refernce to and register for events. The problem I have is when one of the clients die uncleanly without unregistering for the event. The remote ...more >>

How do I turn on Intellisense in the Command Window? It works in the code editor, and it also work's for a co-worker in the Command window for him. One strange thing, is that when I set a break point and go to the command window, I always have the > (command prompt) as the first character, whe...more >>

I am use to working with only single tables with my command object. Now I have 2 tables that need a 1 to 1 relationship. Is it possible to inner join 2 tables in my SQL statement before thowing the data into the DataSet?? I'm trying to avoid the DataRelation object. Also, all the examples I ha...more >>

Hello, in this line: object obj = false ? 0.3 : 1; why does obj end up being a boxed double {1.0} Seems strange to me...more >>

Hi everyone I`m having a problem extracting some values from an app.config file. I`m storing a collection of name value pairs in the config file, and retreiving them using a custom handler that implements IConfigurationSectionHandler. It works fine, except my data is such that I need to be ab...more >>

Hell This must be a simple question, I've a application where users is able to access different datasources. As things are at the moment, the users must supply the ini-file with a connectionstring (not very fancy at all So how do I present the users to a dropdownlist where they can select the ap...more >>

Hi, What the solution to convert this code, please ? Thank's a lot for response LPO SAFEARRAYBOUND sabIn[1]; SAFEARRAY *psaInParms= NULL; sabIn[0].cElements= 4; sabIn[0].lLbound= 0; psaInParms= ::SafeArrayCreate(VT_VARIANT, 1, sabIn); SAFEARRAYBOUND sabOut[1]; SAFEARRAY *ps...more >>

I am attempting to get the maximum value from a specific table (select max(id) from transactions) and it seems to work... that is until you do the following - select the maximu - insert a new record (meaning the id is increased - select the maximum again When done through an oledb transaction...more >>

While reading that everything in C# is an object, why is it that I can do: string temp = ""; instead of string temp = new string(""); Is this just a shortcut the compiler provides? ...more >>

What's the preferred method, or does it matter? class Foo { private MyType msg = new MyType(); Foo() {} } or class Foo { private MyType msg; Foo() { mytype = new MyType(); } ...more >>

Suppose that we have a class with two overloaded ctors defined. And in one ctor, I have written a greate deal of code. So I'd like to reuse those code in another ctor avoiding rewrite them My question is that, whether it is possible to invoke one ctor in another ctor? How to do it? Any example woul...more >>

Hi Group, How can you check if a variable is defined in C#? For example, "string s;" would declare an undefined variable. But how can I check in an "if" statement wether it's defined or not? Regards, Wessel...more >>

I need to load either a graphic or a Flash app in my C# window app. Is there a good way to tell what a file is other than by the file extension? ...more >>

I need to implement an event to notify when a property has changed. Method 1. If I use a generic PropertyChanged event from System.ComponentModel then it will be raised for every property if 1 or more properties changed events are consumed. (more overhead, less coding) i.e PropertyChanged(ob...more >>