I want to calculate the time complexity for this code ?

private int Count(string dir, string[] mask)
{
countblanklin=0;

countcommentlines = 0;
this.statusBar.Text = dir;
this.statusBar.Update();

int totalCount = 0;
string[] dirs = Directory.GetDirectories(dir);


string dirName = dir.Substring(this.startPath.Length);
foreach (string pattern in mask)
{
string[] filenames = Directory.GetFiles(dir, pattern);
foreach (string file in filenames)
{
if (!running)
return 0;

int count = CountFile(file);
if (count > 0)
{
string name = Path.GetFileName(file);
TreeNode node = new TreeNode(name + " (" + count +")");
node.ImageIndex = 1;
node.SelectedImageIndex = 1;
listBox1.Items.Add(node);
totalCount += count;

FileEntry entry = new FileEntry(name, dirName, count);
this.files.Add(entry);
}
}
}
return totalCount;
}

private int CountFile(string path)
{
int count = 0;
countblanklin=0;
countcommentlines=0;
countifs=0;
countelse=0;
StatementCoverage = 0;
Brain b = new Brain();
try
{
StreamReader reader = new StreamReader(path);
String s;
do
{
s = reader.ReadLine();
if (s != null)
{
count++;
bool a = b.IsSource(s);

if (b.CountIfs) countifs++;
if ((b._isinsideif || b._isinsideelse) && (s.Trim().StartsWith(@"}") || s.Trim().StartsWith(@"else"))) b._isinsideif = false;
if ((b._isinsideif || b._isinsideelse) && (s.Trim().StartsWith(@"}"))) b._isinsideelse = false;
if ((b._isinsideif || b._isinsideelse) && !((s.Trim().StartsWith(@"if")) || (s.Trim().StartsWith(@"else"))))
StatementCoverage++;


if (b.CountElae) countelse++;
if (b.CountMultiLineComments)
countcommentlines++;
}
} while (s != null);
reader.Close();
}
catch (IOException)
{
}

return count;
}
_____________________________________________
private void cmdCount_Click(object sender, System.EventArgs e)
{

DateTime then = DateTime.Now;
System.Diagnostics.Process.GetCurrentProcess().ProcessorAffinity = (System.IntPtr)1;
TimeSpan diff = DateTime.Now - then;
} 
String.Format("{0:00}:{1:00}:{2:00}.{3:00}", (diff.Hours), diff.Minutes, diff.Sec