QTP Database conenction and parameterization of the values

[siri]

I have created a DSN as you said .

Code:

Conn.Open("DSN=devmitg,username=xxx,password=yyy")
It is showing me the error like the dsn name is too large
The above is the connection string i am using
Conn.Open("DSN=devmitg")

the same error i posted TNS could not resolve the service _name