I'm trying to open up an existing form from my main form. In that new form, I want to pass a value to a starting form from a button click. I'm using: Form2 f = new Form2() f.Show() but how do I reference the Form1 from the Form2? I tried using ParentForm property, but unsuccessfully. ...more >>

I have the following classes: Public Class BaseClass { ... } Public Class DerivedClass: BaseClass { ... } The following code will throw out an InvalidCastException: BaseClass base = new BaseClass(); DerivedClass derived = (DerivedClass)base; What do I need to do to make the cas...more >>

I'm writing a client/server application that uses TCP/IP to communicate. I using the TcpClient/TcpListener classes to set up the communication and these work well, but I'd like to set up some events to trap when data arrives from the server to the client and vice versa. I've used some TCP/IP com...more >>

Hi all, i'm having a problem using DllImport with Win98. It works just fine with XP & 2000 but in 98 it prompts: "Unable to find xxxxx.dll". Any ideas? error is: System.DllNotFoundException: Unable to load DLL (etc\fectfmn.dll). Peter ...more >>

I've subclassed the TreeNode class and created: NodeAbstract : TreeNode NodeFolder : NodeAbstract NodeFile : NodeAbstract The nodes have been added to a Treeview. Now, I would like to do a drag and drop between nodes inside the treeview. I reference all the nodes with the type NodeAbs...more >>

Hello all, I am new to .NET and a i am moving from Delphi (finally!) to C#. Now, i am trying to develop custom TextBox for numeric input. I have done it almost, now i need to prevent paste so someone couldnt paste letters into numeric text box. How this can be done in C#? In Delphi there was m...more >>

I am (attempting) to move an existing socket application to use raw sockets. Right now, my application is essentially a port forwarder. Upon receiving a connection, it will open a connection to an "internal" server and simply relay all information back and forth (when the client sends somethin...more >>

Hi All, I used the Hashtable.Item in VB.Net, i.e. Dim Tables As New Hashtable Tables.Item(ID) = objTable Now, I tried the same in C#, and got an error says the Hashtable has no Item property. Hashtable Tables = new Hashtable(); Tables.Item(ID) = objTable; Did I miss something or I ...more >>

Hi everyone, Small problem we are having here, just wanted to see if anyone could help out. Basically we have a user control with a textbox (that is docked to fill the whole control) that is going to be a base class for other controls. When you place this user control on a form we want to ...more >>

Hello I have write this program that retrieve all directory and subdirectory recursively of a given directory given in parameter. For each directory, the script find all user permission for the current directory and add the username, permission and directory name into MySQL. The code work...more >>

Say I have a context menu structure like: Top Level 1 Sub Level 1a Sub Level 1b TopLevel 2 Sub Level 2a Sub Level 2b SubLevel 2b-1 SubLevel 2b-2 item1 item2 . . SubLevel 2c From my application...more >>

I'm getting an error "Message queuing is not installed on this computer". This implies that I need to install MSMQ on the computer sending the message as well as the computer which is to receive the message. Right? Seems a bit of an overhead! Cheers ...more >>

I have two interfaces one inherits from the other public interface IEmployee { string FirstName{get; set;} string LastName{get; set;} } public interface IHRMSEmployee : IEmployee { string SSNum{get; set;} } PropertyInfo propInfo = typeof(IHRMSEmployee)GetProperty("Last...more >>

recently i tried to do a simple web site with server with visual studio 2003, the other a sql server 2000. when i try to run aspx pages i get: SQL Server does not exist or access denied. I'm not sure what steps to take to authorize asp.net to connect to my sql server. The app server has n...more >>

Hi! In my current Project i use MS Access as Database. I know some Databases like SQL Server, Oracle, mySQL and the DB/2 from IBM, but no more "Stand- alone" Databases. Did anyone know a Database, where i can use like MS Access (this means, without needing to install a Database like mySQL...more >>

I've created 5 threads to work in my program and I've also created a thread to monitor all 5 threads had still alive or not. Below is part of the monitor thread. bool[] threadState; threadState = new bool[num_thread]; threadState.Initialize(); do { if (threadState[] == true) exitLoop...more >>

Hi there, I had this xml file with me (not yet consider implementing xml namespaces yet). <?xml version='1.0'?> <Object> <Windows> <EID>1</EID> <EDesc>Error 1</EDesc> </Windows> <Windows> <EID>2</EID> <EDesc>Error 2</EDesc> </Windows> </Object> ...more >>

Hi, I had some beginner questions. Do we need Shift << >> or Logical AND OR XOR operator in our daily programming? I am not sure why i need to use it? I had some samples of c# codes using it. Can someone share their experiences why someone should use those operators and what type of scenari...more >>

Something you said the other day, about hiding an asynchronous Invoke of a UI control in a property, stuck with me. Can you point me to an example of this? BTW - I'm about 1/4th of the way through your website. Wow! I'm re-reading your article on Multi-threading in .NET. I was just trying to...more >>

Hi to all. I'm developing a web multi player game. The game will run on the server, and the clients will just show it. All the clients will have few events, by which they can change the game progress. I'm thinking of building the server in C#, and use IIS for communication. The client will be ...more >>

Is it possible in C# to merge two strings to access variable? (Like in JScript: document('variable'+200).style...) What I am trying to do is: I have a class Structure.cs I would like to create several Structure-s, fill their elements with data, but in a way that I can choose starting number...more >>