Basic Network Programming

A comprehensive collection of C# Windows Forms applications demonstrating fundamental network programming concepts, file I/O operations, and email handling.

📖 Overview

This repository contains practical exercises and assignments for learning basic network programming concepts using C#. The projects cover various aspects of network programming including socket programming, web servers, email handling, and file operations.

📁 Folder Structure

Basic-Network-Programming/
├── 📁 practice/
│   ├── 📁 lab1/
│   ├── 📁 lab2/
│   ├── 📁 lab3/
│   ├── 📁 lab4/
│   ├── 📁 lab5/
│   └── 📁 lab6/
├── 📁 assignment/
│   ├── 📁 assignment1/
│   └── 📁 assignment2/
│   └── 📁 assignment3/
│   └── 📁 firebase-webservices/
│   └── 📁 roadmap/
├── 📁 slides/
│   ├── 📄 Lab 01 - Introduction to C# and Windows Forms.pdf
│   ├── 📄 Lab 02 - File and Stream IO in C# - V2019.pdf
│   ├── 📄 Lab 03 - Working with Sockets in C# - 2019.pdf
│   ├── 📄 Lab 04 - Working with Web Server in C.pdf
│   ├── 📄 Lab 05 - Sending Receiving Email in C# - v2021.pdf
│   └── 📄 Lab 06 - Comprehensive Exercises.pdf
└── 📄 README.md

🗂️ Project Structure

Practice Labs (practice/)

• Lab 1: Introduction to C# and Windows Forms
• Lab 2: File and Stream I/O in C#
• Lab 3: Working with Sockets in C#
• Lab 4: Working with Web Servers in C#
• Lab 5: Sending & Receiving Email in C#
• Lab 6: Comprehensive Exercises

Documentation (slides/)

• Complete PDF guides for each lab session
• Step-by-step instructions and theoretical materials

🚀 Features

File Operations

• Read and write text files with proper encoding
• File statistics calculation (lines, words, characters)
• Excel file generation and data export
• Stream handling and file manipulation

Email Functionality

• Connect to IMAP servers (Gmail, MDaemon)
• Retrieve email lists with subject, sender, and date
• Filter emails by date range (last 3 days)
• Display email statistics (total count, recent messages)

Web Operations

• Download web page content
• View HTML source code
• Save web pages to local files

Form Controls

• Rich text editors for content display
• Data grid views for structured data
• File dialogs for file operations
• Progress indicators and status updates

🛠️ Technologies Used

• Language: C#
• Framework: .NET Windows Forms (.NET 9.0 / .NET Framework 4.x)
• Email Library: MailKit for IMAP/SMTP operations
• Excel Operations: DocumentFormat.OpenXml
• File I/O: System.IO namespace
• Network: System.Net namespace

📋 Requirements

• Visual Studio 2019 or later
• .NET Framework 4.7.2+ or .NET 6.0+
• NuGet packages:
  • MailKit (for email operations)
  • DocumentFormat.OpenXml (for Excel operations)

🔧 Setup and Installation

1. Clone the repository:

   git clone https://github.com/yourusername/Basic-Network-Programming.git

2. Open the solution files in Visual Studio

3. Restore NuGet packages:

   dotnet restore

4. Build and run the desired project

💡 Usage Examples

Email Client (Lab5_Bai4.cs)

// Connect to Gmail and retrieve emails from last 3 days
private void ReadGmailWithMailKit(string email, string password)
{
    DateTime threeDaysAgo = DateTime.Now.AddDays(-3);
    var query = SearchQuery.DeliveredAfter(threeDaysAgo);
    var results = inbox.Search(query);
    // Display results in DataGridView
}

File Operations (Lab2_Bai1.cs)

// Read file content and display
OpenFileDialog ofd = new OpenFileDialog();
ofd.ShowDialog();
StreamReader sr = new StreamReader(ofd.FileName);
string content = sr.ReadToEnd();
richTextBox1.Text = content;

File Writing (Lab2_Bai3.cs)

// Write content to file with UTF-8 encoding
SaveFileDialog sfd = new SaveFileDialog();
sfd.Filter = "Text (*.txt) | *.txt";
FileStream fs = new FileStream(sfd.FileName, FileMode.OpenOrCreate);
byte[] ct = Encoding.UTF8.GetBytes(richTextBox2.Text);
fs.Write(ct, 0, ct.Length);

🎯 Learning Objectives

• Understand Windows Forms application development
• Master file I/O operations and stream handling
• Learn socket programming fundamentals
• Implement email clients using IMAP/SMTP protocols
• Work with web servers and HTTP requests
• Handle data serialization and file formats

📚 Course Materials

Each lab includes PDF documentation with detailed instructions:

• Lab 01 - Introduction to C# and Windows Forms.pdf
• Lab 02 - File and Stream IO in C# - V2019.pdf
• Lab 03 - Working with Sockets in C# - 2019.pdf
• Lab 04 - Working with Web Server in C.pdf
• Lab 05 - Sending Receiving Email in C# - v2021.pdf
• Lab 06 - Comprehensive Exercises.pdf

🤝 Contributing

This is an educational project. Feel free to:

• Report bugs or issues
• Suggest improvements
• Add new features or examples
• Enhance documentation

📄 License

This project is for educational purposes. Please check with your institution regarding usage and distribution policies.

📞 Support

For questions or issues related to the exercises, please refer to the course materials or contact your instructor.

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Note: This repository contains coursework for Basic Network Programming. All implementations are for learning purposes and may require additional security considerations for production use.