C#

private void cmdCopy_Click(object sender, System.EventArgs e)
{
	if(!Directory.Exists(txtDist.Text))
	{
		MessageBox.Show("Please enter a valid path");
		return;
	}
	DirectoryInfo dir=new DirectoryInfo(txtSrc.Text);
	CopyDirectory(txtSrc.Text,txtDist.Text+"\\"+dir.Name);
	MessageBox.Show("OK");
}

private void CopyDirectory(string src,string dist)
{
    if(!Directory.Exists(dist))
		Directory.CreateDirectory(dist);

    FileInfo file;
	DirectoryInfo dir;
	string[] strFiles;
	string[] strDirs;

	//Copy all files...
	strFiles=Directory.GetFiles(src);
	foreach (string strFile in strFiles)
	{
		file=new FileInfo(strFile);
		file.CopyTo(dist+"\\"+file.Name);
	}
    
	//Copy child directories...
	strDirs=Directory.GetDirectories(src);
	foreach (string strDir in strDirs)
	{
		dir=new DirectoryInfo(strDir);
		if(dir.FullName==dist)//check to prevent infinite loop if the distination is under the source folder..
			continue;
		CopyDirectory(dir.FullName,dist+"\\"+dir.Name);
	}
}