Finding nth prime

[Flashbond]

Actually this was something for C++ codebank. Not the fastest but an elegant code written by me.

// This code was written by Mert Ener
#include <time.h>
#include <iostream>

private: System::Void button1_Click_1(System::Object^  sender, System::EventArgs^  e) { 
UInt64 cloc = clock();
long o,m = 1;
long k = long::Parse(textBox1->Text)-2; // The textbox you entered for the nth prime.
vector<int> p(1,2);
for( long n = 0; n <= k; n++ ) {
m += 2;
for( long l = 1;o=p[l],o*o<=m; l++ ) {
if (m % p[l] == 0) {
m += 2;
l=0;}}
p[n+1]=m;}
textBox2->Text = p[k+1].ToString(); // The textbox for the result.
MessageBox::Show("It took me " + (clock() - cloc).ToString() + " milliseconds to find your prime.");}