using UnityEngine;
using System.Collections;
using System.Data;
using FirebirdSql.Data.FirebirdClient;

public class SQLConnection : MonoBehaviour {

    public void Start () {
        string conn = @"Database=C:databaseinventory.FDB;" + "User=SYSDBA;" + "Password=masterkey;" + "Dialect=3;" + "Server=localhost";
        FbConnection dbcon = new FbConnection(conn);
    }

}

TypeLoadException: Could not load type 'FirebirdSql.Data.FirebirdClient.FbConnectionString' from assembly 'FirebirdSql.Data.FirebirdClient, Version=4.1.0.0, Culture=neutral, PublicKeyToken=3750abcc3150b00c'. (wrapper remoting-invoke-with-check) FirebirdSql.Data.FirebirdClient.FbConnection:.ctor (string) SQLConnection.Start () (at Assets/SQLConnection.cs:12)