copy a directory in csharp in csharp

main.cs
using System.IO;

public static void CopyDirectory(string sourceDir, string destinationDir)
{
    DirectoryInfo dir = new DirectoryInfo(sourceDir);

    // If the source directory does not exist, throw an exception
    if (!dir.Exists)
    {
        throw new DirectoryNotFoundException(
            "Source directory does not exist or could not be found: " 
            + sourceDir);
    }

    // If the destination directory does not exist, create it.
    if (!Directory.Exists(destinationDir))
    {
        Directory.CreateDirectory(destinationDir);
    }

    // Get the files that are in the source directory and copy them to the destination directory
    FileInfo[] files = dir.GetFiles();
    foreach (FileInfo file in files)
    {
        string temppath = Path.Combine(destinationDir, file.Name);
        file.CopyTo(temppath, false);
    }

    // Get the subdirectories in the source directory and copy them to the destination directory
    DirectoryInfo[] dirs = dir.GetDirectories();
    foreach (DirectoryInfo subdir in dirs)
    {
        string temppath = Path.Combine(destinationDir, subdir.Name);
        CopyDirectory(subdir.FullName, temppath);
    }
}
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