MySql Connection

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C#

Please I need a help on this:
I am getting error: "Input string was not in a correct format." when I run this code snippet. Everything, I think, is ok

using MySql.Data.MySqlClient;

private void button1_Click(object sender, EventArgs e)
{
  string connString = "Server=localhost;Database=mmt_gui;Uid=root;";

            MySqlConnection myConn = new MySqlConnection(connString);

            myConn.Open();           

            DataTable myDt = myConn.GetSchema("Tables");
            dataGridView1.DataSource = myDt;
            myConn.Close();
}

The problem is with method GetShema("Tables")
Thanks in anticipation.