How to enable database access from Java or CSharp ?

I set up an Oracle Express database on my local computer.
Now I want to connect to this databsee from a CSharp (or Java) program.
How do I have to specify the connection string?
The following does NOT work:
connectionstring = "Data Source=XE;User Id=karl;Password=mypassword";
connection = new OracleConnection(connectionstring);
connection.Open();
I am getting an error
"Invalid argument" ORA-12532 error
How do I have to specify the connection string otherwise ?
Is the sequence of the parameter Data Source, User Id and Password
important ?
How do I get a more detailed error message from Oracle ?
Do I have to enable the accessibility from outside programs
in Oracle somewhere ?

about to the error:
ORA-12532 TNS:invalid argument
Cause: An internal function received an invalid parameter. This message is not normally visible to the user.
Action: For further details, turn on tracing and re-execute the operation. If the error persists, contact Oracle Support Services.
Regards

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