Maybe you forgot to add an assembly reference?

Don’t know what the problem is here. I’ve been following the instructions here, but Unity complains about the code:

import System;
import System.Data;
import System.Data.SqlClient;

var IPAddress : String;
var SchemaName: String;
var Username: String;
var Password: String;

function Start () {
	var dbcon : IDbConnection;
	var connectionString : String =
	IPAddress + "," + SchemaName + "," + Username + "," +Password;
	dbcon = new SqlConnection(connectionString);
	dbcon.Open();
}

I do have MySql.Data.dll and System.Data.dll in my assets under Assets\DLL\

Do the DLLs need to be in a specific place? Or am I just using DDLs incorrectly altogether?

Please change line #3 from

import System.``Data``.``SqlClient;

to

import System.Data``.**My**``SqlClient;

Guess Unity had a hickup when importing those DLLs. All is in working order.

That doesn’t exist in the System.Data namespace…