KeyNotFoundException: The given key was not present in the dictionary.

Hello
Im Trying to access to a DB created in MariaDB with HeidiSQL
this is the code:

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4. //Uso de librería para acceder a bases de datos  FSQL
5.  
6. using System.IO;
7. using Mono;
8. using System.Data;
9. using System.Data.SqlClient;
10. using System.Data.Sql;
11. using System.Data.Services;
12. using MySql.Data.MySqlClient;
13. //using System.Data.Common.DbConnection;
14. using Mono.Security;
15.  
16.  
17. public class conexion : MonoBehaviour {
18.     string dataconection="Server=localhost;Port=3306;Database=test_blackdish;Uid=root;Pwd=xxxxxxx";
19.        
20.     void Start(){
21.         Debug.Log(System.Environment.Version);
22.         MySqlM();
23.     }
24.     public void MySqlM(){
25.  
26.         MySqlConnection conn=new MySqlConnection();
27.        
28.         conn.ConnectionString=dataconection;
29.    
30.  
31.         try{
32.  
33.             conn.Open();
34.             Debug.Log("conexion establecida");
35.         }
36.         catch(MySqlException errorvar){
37.             Debug.Log("ERROR:"+errorvar);
38.  
39.         }
40.     }
41.     public void Conectar(){
42.         Debug.Log("conectar");
43.         // se crea la instancia de la conexion
44.        
45.       SqlConnection con =  new SqlConnection();
46.         //Se asigna a la variable referenciada  ConnectionStrign los parámatros de la conexion a la base de datos
47.         con.ConnectionString=dataconection;
48.         Debug.Log("con.conection!");
49.  
50.         //Se abre la comunicación con el servidor
51.        
52.         con.Open();//wait
53.         Debug.Log("con.Open();");
54.        
55.         //se verifica la conexión
56.    
57.         if(con.State == System.Data.ConnectionState.Open){
58.             Debug.Log("Conectada");
59.         }
60.         else{
61.             Debug.Log("Error");
62.         }
63.  
64.         Debug.Log("--------END");
65.     }
66. //
67.    
68. }

but it gives me this error:

Code (CSharp):

1. KeyNotFoundException: The given key was not present in the dictionary.
2. System.Collections.Generic.Dictionary`2[System.String,System.Object].get_Item (System.String key) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Collections.Generic/Dictionary.cs:150)
3. MySql.Data.MySqlClient.MySqlConnectionStringBuilder.get_Database ()
4. MySql.Data.MySqlClient.MySqlConnection.set_ConnectionString (System.String value)
5. conexion.MySqlM () (at Assets/conexion.cs:28)
6. conexion.Start () (at Assets/conexion.cs:22)
7.  

I already insert the dlls MySql.Data.dll, System.Data.dll,System.Data.OracleClient.dll,System.Data.Services.dll,System.Data.Services.Client.dll