Function not returning any rows

Question

If I run this code with a standard SQL statement it will return (1) row - which is correct. But when I try to use a function it is not returning any records. Could someone point what I'm doing wrong?
Also, if a use BindByName if get Oracle error: ORA-06550: line 1, column 50: PLS-00103: Encountered the symbol ">". If I comment out BindByName I will not get this error . Thanks!
C# code:
string domainuser = 'brockj';
string ConnectString = ConfigurationSettings.AppSettings["ConnectString"];
OracleConnection dbconn = new OracleConnection(ConnectString);
OracleCommand cmd = new OracleCommand("access_admin",dbconn);
cmd.CommandType = CommandType.StoredProcedure;
//cmd.BindByName = true;
OracleParameter p_username = new OracleParameter();
OracleParameter p_retval = new OracleParameter();
p_username.OracleDbType = OracleDbType.Varchar2;
p_retval.OracleDbType = OracleDbType.Int16;
p_username.Direction = ParameterDirection.Input;
p_retval.Direction = ParameterDirection.ReturnValue;
p_username.Value = domainuser;
cmd.Parameters.Add(p_username);
cmd.Parameters.Add(p_retval);
dbconn.Open();
cmd.ExecuteScalar();
lblResponse.Text = p_retval.Value.ToString(); -- prints '0', should print '3'
********FUNCTION************
Function access_admin
p_username IN varchar2
RETURN number
IS
l_accesscode users.access_admin%TYPE; -- number(1)
cursor c1 IS
     SELECT access_admin
     FROM users
     WHERE username = p_username
     AND active=1
     AND rownum=1;
BEGIN
open c1;
fetch c1 into l_accesscode;
if c1%NOTFOUND then
     l_accesscode := 0;
end if;
close c1;
RETURN l_accesscode;
END access_admin;

Answer 1

Turn the function call into a standard SQL statement:
SELECT access_admin FROM dual;
Here's how you use BindByName:
adapter = new OracleDataAdapter();
adapter.SelectCommand = new OracleCommand("SELECT * FROM emp WHERE sal >= :SAL OR empno = :EMPNO", conn);
adapter.SelectCommand.BindByName = true;
adapter.SelectCommand.Parameters.Add(new OracleParameter("EMPNO", OracleDbType.Int32, 0));
adapter.SelectCommand.Parameters["EMPNO"].Value = 7788;
adapter.SelectCommand.Parameters.Add(new OracleParameter("SAL", OracleDbType.Int32, 0));
adapter.SelectCommand.Parameters["SAL"].Value = 2000;
-- Tom