ฟ้อง Syntax error in UPDATE statement. หาทางแก้ไม่ได้เลย

private void insertOrUpdate()
       {
           if (txtName.Text == "")
           {
               MessageBox.Show("กรุณากรอกข้อมูลให้ครบ", "Warning");
               return;
           }
           string sql = "";
           if (txtID.Text == "")
               sql = "INSERT INTO Receipet(CustName,Tel,Dates,Time,Field,Hours) VALUES(@name,@tel,@date,@time,@field,@hours)";
           else
               sql = "UPDATE Receipet SET CustName = @name,Tel = @tel,Dates = @date,Time = @time,Field = @field,Hours = @hours " + "WHERE CustID = "
                       + txtID.Text;
           _cmd = new OleDbCommand(sql, _conn);
           _cmd.Parameters.AddWithValue("name", txtName.Text);
           _cmd.Parameters.AddWithValue("tel", txtTel.Text);
           _cmd.Parameters.AddWithValue("date", txtDate.Text);
           _cmd.Parameters.AddWithValue("time", txtTime.Text);
           _cmd.Parameters.AddWithValue("field", txtField.Text);
           _cmd.Parameters.AddWithValue("hours", txtHours.Text);
           int affectedRow = _cmd.ExecuteNonQuery();
           if (affectedRow < 1)
               MessageBox.Show("เกิดข้อผิดพลาดในการบันทึกข้อมูล", "Warning");
           else
           {
               MessageBox.Show("ข้อมูลถูกจัดเก็บแล้ว", "Result");

               string name = txtName.Text;

               readData();
               fillListBox();
               clearBindings();

               int idx = lstRec.FindStringExact(name);
               if (idx > -1)
                   lstRec.SetSelected(idx, true);
           }
       }