Files.md

Files in CSharp

Definition: A File is a collection of data stored on a storage device, such as a hard drive or SSD. Files can be text files, binary files, images, or any other type of data. In C#, the System.IO namespace provides classes for working with files.

Read from a File:

using System.IO;
string filePath = "example.txt";
if (File.Exists(filePath))
{
	string content = File.ReadAllText(filePath);
	Console.WriteLine(content);
}
else
{
	Console.WriteLine("File does not exist.");
}

Create a File:

using System.IO;
string filePath = "newfile.txt";
File.WriteAllText(filePath, "Hello, World!");
Console.WriteLine("File created successfully.");

Write to a File:

using System.IO;
string filePath = "example.txt";
File.AppendAllText(filePath, "\nNew line added.");
Console.WriteLine("Text appended to file.");

• Write to a File without deleting existing content using streamWriter:

using System.IO;
string filePath = "example.txt";
using (StreamWriter writer = new StreamWriter(filePath, true))
{
	writer.WriteLine("Another line added.");
}
Console.WriteLine("Text appended to file using StreamWriter.");

• Write to a File adding multiple lines:

using System.IO;
string filePath = "example.txt";
using (StreamWriter writer = new StreamWriter(filePath, true))
{
	writer.WriteLine("First line.");
	writer.WriteLine("Second line.");
	writer.WriteLine("Third line.");
}
Console.WriteLine("Multiple lines added to file using StreamWriter.");

Delete a File:

using System.IO;
string filePath = "example.txt";
if (File.Exists(filePath))
{
	File.Delete(filePath);
	Console.WriteLine("File deleted successfully.");
}
else
{
	Console.WriteLine("File does not exist.");
}