using (MySqlConnection connection = new MySqlConnection(connectionString))
{
     foreach(DataRow row in dataTable.Rows)
     {
         string query = "INSERT INTO TableName (Column1, Column2, Column3...) VALUES (@Parameter1, @Parameter2, @Parameter3)";
          
         MySqlCommand command = new MySqlCommand(query, connection);
         command.Parameters.AddRange(new[] {new SqlParameter("@Parameter1", row["Column1"]), new SqlParameter("@Parameter2", row["Column2"]), new SqlParameter("@Parameter3", row["Column3"])  });

         connection.Open();
         command.ExecuteScalar();
         connection.Close();
     }
}