ผมหัดเขืยน C# insert Data to Oracle BD มัน Error:ORA-00936: missing expression

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Data.OleDb;

namespace ProjectConn
{
    class ClassConn
    {
        public static OleDbConnection conn = null;
        public void Conn_Toay()
        {
            conn = new OleDbConnection("Provider=MSDAORA; Data Source=XE; User ID=hr; Password=hr; Unicode=True");
            conn.Open();
           
        }
    }
}

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 System.Data.OleDb;
using System.Data.OracleClient;

namespace ProjectConn
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
           
                ClassConn NewConn = new ClassConn();
                NewConn.Conn_Toay();

            OleDbCommand comm = new OleDbCommand();
            comm.Connection = ClassConn.conn;

            comm.CommandText= "insert into Testing (name) values (@name)";
            comm.Parameters.AddWithValue("@name", textBox1.Text);
            
            comm.ExecuteNonQuery();

        }
    }
}