Problème accès base de données C# MySQL Workbench

Bonjour,

j'ai un problème quand j'essaye d'accéder a une base de données MySQL Workbench a partir de visual studio desktop(express 2015)

ca donne Une exception non gérée du type 'MySql.Data.MySqlClient.MySqlException' s'est produite dans MySql.Data.dll

Informations supplémentaires : Authentication to host 'localhost' for user 'root' using method 'mysql_native_password' failed with message: Unknown database 'dbb'

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using MySql.Data.MySqlClient;
using MySql.Web;
 
namespace hd
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
 
        private void Form1_Load(object sender, EventArgs e)
        {
        }
 
        private void button1_Click(object sender, EventArgs e)
        {
 
            if (textBox1.Text == "" || textBox2.Text == "")
            {
                MessageBox.Show("entrez Nom d’utilisateur et Mot de passe");
                return;
            }
 
            string myConnection = "Server=localhost;port=3306;Database=dbb;username=root;password=psw";
 
 
            MySqlConnection myConn = new MySqlConnection(myConnection);
 
 
            MySqlCommand cmd = new MySqlCommand("Select * Role from Agent where UserName=@UserName and Password=@Password", myConn);
 
 
            cmd.Parameters.AddWithValue("@UserName", textBox1.Text);
            cmd.Parameters.AddWithValue("@Password", textBox2.Text);
 
 
            myConn.Open();
 
            MySqlDataAdapter adapt = new MySqlDataAdapter(cmd);
            DataSet ds = new DataSet();
 
 
            adapt.Fill(ds);
 
            int count = ds.Tables[0].Rows.Count;
 

            if (count == 1)
            {
                if (ds.Tables[0].Rows[0]["Role"].ToString() == "admin")
                {
                    frmadmin fm = new frmadmin();
                    fm.Show();
                }
            }
 
            myConn.Close();
        }
    }
}

merci