How do you measure the number of open database connections

Question

I am trying to determine if I have a database connection leak. So I need to see the number of open connections. I have some simple test code that creates a leak:

protected void Page_Load(object sender, EventArgs e)
{
  for(int i = 0; i < 100; i++)
  {
    SqlConnection sql = new SqlConnection(@"Data Source=.\SQLExpress;UID=sa;PWD=fjg^%kls;Initial Catalog=ABC");
    sql.Open();
  }

}

Note there is no .Close and this does infact crash after being run 3 times in quick succession.

In order to measure the leak I am running the Performance monitor and measuring SQLServer: General Statistics/User Connections:

However, these seem to be zero when I run my code:

What should I change to actually see the connections?

ANSWER

I have approved an answer below. Even though it doesn't use the performance tools, its good enough for my use. Bottom line is I wanted to see how many connections remain open after opening a web page and this did the trick.

Answer 1

Have you tried running the sp_who stored proc? If there are stale open connections they should show up there.

To show just the sa users processes run:

EXEC sp_who 'sa'

Answer 2

You can try running a query against the master db like this:

SELECT SPID,
       STATUS,
       PROGRAM_NAME,
       LOGINAME=RTRIM(LOGINAME),
       HOSTNAME,
       CMD
FROM  MASTER.DBO.SYSPROCESSES
WHERE DB_NAME(DBID) = 'TEST' AND DBID != 0 

See this link for more details.