help me how can slove this message (Syntax error in UPDATE statement.)?

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.OleDb;
namespace WindowsFormsApplication35
{
    public partial class Form3 : Form
    {
        public Form3()
        {
            InitializeComponent();
        }
        private void button1_Click(object sender, EventArgs e)
        {
            OleDbConnection cn = new OleDbConnection(@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\qq.accdb;Persist Security Info=False");
            cn.Open();
            OleDbCommand cm=new OleDbCommand("UPDATE qq SET ahmed='"+textBox1.Text+"',ali="+textBox2.Text+",NOTE='"+textBox3.Text+"' WHERE ID="+comboBox1.Text,cn);
            cm.ExecuteNonQuery();
            cn.Close();
            MessageBox.Show("done");
        }
        private void button2_Click(object sender, EventArgs e)
        {
            OleDbConnection cn = new OleDbConnection(@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\qq.accdb;Persist Security Info=False");
            OleDbDataAdapter da = new OleDbDataAdapter("select *from qq where ID=" + comboBox1.Text, cn);
            DataSet ds = new DataSet();
            da.Fill(ds, "qq");
            textBox1.DataBindings.Add("text", ds, "qq.ahmed");
            textBox2.DataBindings.Add("text", ds, "qq.ali");
           textBox3.DataBindings.Add("text", ds, "qq.NOTE");
        }
        private void Form3_Load(object sender, EventArgs e)
        {
            OleDbConnection cn = new OleDbConnection(@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\qq.accdb;Persist Security Info=False");
            OleDbDataAdapter da = new OleDbDataAdapter("select ID from qq", cn);
            DataSet ds = new DataSet();
            da.Fill(ds, "qq");
            comboBox1.DataSource = ds.Tables["qq"];
            comboBox1.DisplayMember = "ID";
        }
    }
}