Copy or move a directory into destination directory and merge their contents

MergeDirectories.cs

public static void MergeDirectories(string sourceDir, string destDir, bool moveMode = false, bool overwriteMode = false)
{
	if (!Directory.Exists(destDir))
	{
		Directory.CreateDirectory(destDir);
	}
	var dir = new DirectoryInfo(sourceDir);


	foreach (var file in dir.GetFiles())
	{
		var destFileName = Path.Combine(destDir, file.Name);
		if (overwriteMode && File.Exists(destFileName))
		{
			File.Delete(destFileName);
		}

		if (moveMode)
		{
			file.MoveTo(destFileName);
		}
		else {
			file.CopyTo(destFileName);
		}
	}

	foreach (var subDir in dir.GetDirectories())
	{
		var destDirName = Path.Combine(destDir, subDir.Name);
		if (Directory.Exists(destDirName))
		{
			MergeDirectory(subDir.FullName, destDirName, moveMode, overwriteMode);
			
			if (moveMode)
			{
				subDir.Delete();
			}
		}
		else
		{
			if (moveMode)
			{
				subDir.MoveTo(destDirName);
			}
			else {
				MergeDirectory(subDir.FullName, destDirName, false, overwriteMode);
			}
		}
	}
}