Error while connecting firebird embeded 64bit version with C#

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Firebird

I am trying to use Firebird 2.5.5 64 bit embeded version with C# (Frame work 4.5). Anybody can help me on below things

1. Which .dll i have to refer for ado connection (FirebirdSql.Data.Firebird.dll or FirebirdSql.Data.Firebirdclient.dll)
2. How to resolve the error (An unhandled exception of type 'Firebirdsql.data.firebird.Fbexception) occured in FirebirdSql.data.Firebird.dll

What I have tried:

using FirebirdSql.Data.Firebird;

Connection

static string connectionString = "ServerType=1;User=SYSDBA;Password=masterkey;Dialect=3;Database=mydb.FDB";
FbConnection mConn = new FbConnection(connectionString);

Data fetching

FbDataAdapter da = new FbDataAdapter("SELECT * FROM table1", mConn);
DataTable dt = new DataTable();
da.Fill(dt);