C# Network Programming Video Tutorial309

C# is a powerful programming language that can be used to create a variety of applications, including network applications. In this tutorial, we'll show you how to create a simple C# network application that can send and receive data over a network.

Prerequisites

Before you can start this tutorial, you'll need to have the following installed:* Visual Studio 2019 or later
* .NET Core 3.1 or later
* A basic understanding of C# programming

Creating a New Project

To create a new C# network application, open Visual Studio and create a new project. Select the "Console App (.NET Core)" template and click "OK".

Once the project is created, add a new reference to the namespace. To do this, right-click on the project in the Solution Explorer and select "Add" > "Reference...". In the Reference Manager dialog box, select the "Assemblies" tab and search for "". Check the box next to "" and click "OK".

Creating a Server

The first step is to create a server that will listen for incoming connections. To do this, we'll use the TcpListener class. The following code shows how to create a server:```csharp
using System;
using ;
using ;
namespace Server
{
class Program
{
static void Main(string[] args)
{
// Create a new TcpListener object.
TcpListener server = new TcpListener(, 12345);
// Start the server.
();
// Accept a new connection.
TcpClient client = ();
// Get the client's stream.
NetworkStream stream = ();
// Read data from the client.
byte[] buffer = new byte[256];
int bytesRead = (buffer, 0, );
// Write data to the client.
string data = "Hello, world!";
byte[] dataBuffer = (data);
(dataBuffer, 0, );
// Close the stream.
();
// Close the client.
();
// Stop the server.
();
}
}
}
```

In this code, we first create a new TcpListener object and specify the IP address and port that the server will listen on. We then start the server and wait for a client to connect. Once a client connects, we accept the connection and get the client's stream. We then read data from the client and write data back to the client. Finally, we close the stream and the client.

Creating a Client

The next step is to create a client that will connect to the server. To do this, we'll use the TcpClient class. The following code shows how to create a client:```csharp
using System;
using ;
using ;
namespace Client
{
class Program
{
static void Main(string[] args)
{
// Create a new TcpClient object.
TcpClient client = new TcpClient();
// Connect to the server.
("127.0.0.1", 12345);
// Get the client's stream.
NetworkStream stream = ();
// Write data to the server.
string data = "Hello, world!";
byte[] dataBuffer = (data);
(dataBuffer, 0, );
// Read data from the server.
byte[] buffer = new byte[256];
int bytesRead = (buffer, 0, );
// Print the data to the console.
string responseData = (buffer, 0, bytesRead);
(responseData);
// Close the stream.
();
// Close the client.
();
}
}
}
```

In this code, we first create a new TcpClient object and specify the IP address and port of the server that we want to connect to. We then connect to the server and get the client's stream. We then write data to the server and read data from the server. Finally, we print the data to the console, close the stream, and close the client.

Testing the Application

To test the application, run both the server and client projects. The server project should listen for incoming connections on port 12345. The client project should connect to the server on port 12345 and send and receive data.

If the application is working correctly, you should see the following output in the client console:```
Hello, world!
```

2024-11-28

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