Can connect oracle database in xamarin

Can connect oracle database in cross plateform xamarin?
 
it is showing error when open the connection(oracle connection is not openning)
 
Error
Unhandled Exception: System.DllNotFoundException: occurred

public static string constr = @"Data Source=(DESCRIPTION =
   (ADDRESS_LIST =
     (ADDRESS = (PROTOCOL = TCP)(HOST = *********)(PORT = ****))
   )
   (CONNECT_DATA =
     (SERVER = DEDICATED)
     (SERVICE_NAME = ******)
   )
 ); User ID=****;Password=****;Unicode=True";

using (OracleConnection conn = new OracleConnection(connectionstring.constr))
        {
            if (conn.State == ConnectionState.Closed)
            {
                conn.Open();
            }
            //using (OracleConnection con = new OracleConnection(connectionstring.constr))
            //{
            UsernameEntry.Text = "";

            OracleCommand cmd = new OracleCommand("SELECT * FROM tbltest", conn);
            OracleDataAdapter oda = new OracleDataAdapter(cmd);
            DataSet ds = new DataSet();
            oda.Fill(ds);
            UsernameEntry.Text = ds.Tables[0].Rows[0]["LOGINID"].ToString();
            //UsernameEntry.Text = "Hello Kuldeep";

        }