i get this error if i write this : using System.Net.Sockets; .... .... TcpClient tcp; tcp=new TcpClient(); An unhandled exception of type 'System.Net.Sockets.SocketException' occurred in system.dll Additional information: An operation on a socket could not be performed becaus...more >>

What is wrong with this? class Example1 { public static long myClassVar; public static void Main() { { long myClassVar = 5; } myClassVar = 36; } } It will not compile.....why? I do not need a "fix" but rather am confused why thi...more >>

Hi there, I can use the method DropDownList1.Items.Add("test") to add data to the dropdownlist control. But how should I do if I want to insert the control property TEXT is "test" and the VALUE is "1". Thanks !! -- Paul ...more >>

What steps would I need to take to build a complete application from scratch? I'll be working on a payroll/HR application but, instead of just starting to program like I normally would do, I would like to be to do it correctly. What steps (in terms of designing, drawing, flowcharts, etc...) woul...more >>

I am writing a customized DataGrid control which will allow the user to only select an entire row (and not a cell inside the row). So I want to add readonly columns to the datagrid. To achieve this, instead of using a "DataGridTextBoxColumn" inside the datagrid I want the control to use a "DataG...more >>

I have an object that serializes back and forth. I would like to have some objects not serialize ..and when I read that info back into the class, have this item be null ( or something like it ). I modified a class I made by XSD.exe by adding these values ( drvltr, disknum) , but I found wh...more >>

I'm wondering why the form created in the code below stays "alive". I would have thought that because the form variable is local to the method, that garbage collection would get rid of it. Makes me wonder if there is a reference to it somewhere? // a button on one form is used to call a stat...more >>

Background: I am investigating a problem involving a windows .NET application that is being developed in C# with Visual Studio 2003. It is a multi-threaded application that uses MSMQ to communicate between the threads. The problem is that the program infrequently terminates with no indica...more >>

Hello all, This is my first c# program. And I seem to have a problem. Here is the code: FileStream myStream = new FileStream("d:\\test.txt", FileMode.Create, FileAccess.Write); BinaryWriter writer = new BinaryWriter(myStream); writer.Write("ntestestse"); writer.Close(); In my text f...more >>

I've made some controls that have namespaces and I have trouble with the "using namespace" line, it doesn't do anything. Here's what's going on: 1). I have a class like this: namespace N1.N2 { class A{}; } 2). I reference the project with N1.N2 from another project's file where I...more >>

I am having trouble adding some of my existing controls to my toolbox in VS.NET. Here's what is going on: 1). I have an existing project that is a Windows Control Library with a bunch of controls. 2). I start a new solution and create an Application 3). I add the existing project with my co...more >>

i am preparing my graduation project, it is website and i need to hep about uploading a picture from client side and insert MSSQL server database. if you can send me example code i would be glad. ...more >>

Hi, On a previous question someone recommended using the System.Security.Cryptography to fill an array with strong random bytes. It works but I can't specify the max value of course.. I solved it by subsequently removing all 'higher than max' values, but this is not efficient, nor fast. ...more >>

Hi All, What is a best way to handle an undefined value object class that returned from a function. I have a function that call the ADO.NET ExecuteScalar() function and returns the object to the calling function as follow: public object FunctionA() { object RetVal; ... some p...more >>

Hi all, I have a System.Windows.Forms.ListBox object that I am putting objects into. These objects are of custom types that I am defining. The list box displays each object by its class name -- not exactly usable :). So what I would like is to control the text that is displayed. Apparently, ov...more >>

Hello all, I'm currently writing a program in which I need a textbox control, similar to the code editor in .NET. but with line numbers and such. I can't find anything third-party that even comes close to what I want to do, so I figured I'd have to write one myself. I started first by inher...more >>

I'm looking for some kind of simple string compression code I can use. I'm not looking for SharpZipLib. Their implimentation spans several classes and is very complex. I'm just looking for something simple. A single class, preferrably. Does such a thing exist? Thanks, Chris ...more >>

I am currently implementing a scientific library in C#. The algorithms include some system dependent tuning parameters (lets say memory vs. speed parameters for example). Since, those parameters are quite numerous, it would be cumbersome for the client of the library to be forced to provide expl...more >>

Hi, I want to use a scrollbar that can receives Images( bitmap or ... ). Can I use standard scroll bar or should use another? thank. ali ...more >>

I think Microsoft purposely makes it difficult to learn their products. Two examples of this are evident in the following MS example. http://samples.gotdotnet.com/quickstart/aspplus/default.aspx?url=%2fquickstart%2fhowto%2fdoc%2fWinForms%2fWinFormsOwnerDrawListBox.aspx One: The example code do...more >>

I have built Web service that allows me to send input parameters as a complex type: public class User { public string FirstName; public string LastName } [WebMethod] public void UpdateUserDetails(User user) {string fn = user.FirstName; string ln = user.LastName} This works f...more >>

Hi, I want to manually register VsWizard.dll on my system. I tired regsvr32 "C:\Program Files\Microsoft Visual Studio .NET\Common7\IDE\VsWizard.dll", but then it reports, "C:\Program Files\Microsoft Visual Studio ..NET\Common7\IDE\VsWizard.dll" is not an executable file and no registration ...more >>

Hello, I have two text boxes accepting ints and displaying their Sum. This code works: string ans; ans = Convert.ToString(Convert.ToInt32(textBoxX.Text) + Convert.ToInt32(textBoxY.Text)); labelAnswer.Text = ans; But this code generates InvalidCastException: labelAnswer.Text = C...more >>