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Home Forums How do you zip a folder and all its contents using built-in C# libraries? – MindStick
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1 Answers

Anubhav Sharma
Anubhav Sharma 26 May 2025
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To zip a folder and all its contents using built-in C# libraries, use the System.IO.Compression.ZipFile class, available in .NET Framework 4.5+ and .NET Core.

Example: Zip an Entire Folder

using System.IO.Compression;

public class ZipHelper
{
    public static void ZipFolder(string sourceFolderPath, string destinationZipPath)
    {
        // Overwrite if ZIP already exists
        if (File.Exists(destinationZipPath))
            File.Delete(destinationZipPath);

        ZipFile.CreateFromDirectory(sourceFolderPath, destinationZipPath, CompressionLevel.Optimal, includeBaseDirectory: true);
    }
}

Usage

string sourceFolder = @"C:\MyData\Reports";
string destinationZip = @"C:\MyData\Reports.zip";

ZipHelper.ZipFolder(sourceFolder, destinationZip);

Parameters Explained

Parameter Description
sourceFolderPath Folder to zip
destinationZipPath Destination ZIP file path
CompressionLevel.Optimal Uses best balance of compression and speed
includeBaseDirectory: true Includes the top-level folder in the archive

Notes

  1. Requires a reference to System.IO.Compression and System.IO.Compression.FileSystem.
  2. If using .NET Core or .NET 5+, just import the namespaces—no need for extra assembly references.
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