title: System.Data.OleDb.OleDbException: 'Invalid SQL statement; expected 'DELETE', 'INSERT', 'PROCEDURE', 'SELECT', or 'UPDATE'.' in my Accounting Project
body: <p>I'm making an Accounting project in C# Visual Studio 2017 and I have three forms: </p>
  
  <ol>
  <li>Login</li>
  <li>Main</li>
  <li>Product Entry</li>
  </ol>
  
  <p>1st and 2nd form work properly, but when I clicked the button of Product Entry (3rd form),
  project doesn't go to 3rd form and it shows this error:</p>
  
  <blockquote>
    <p>System.Data.OleDb.OleDbException: 'Invalid SQL statement; expected
    'DELETE', 'INSERT', 'PROCEDURE', 'SELECT', or 'UPDATE'.'</p>
  </blockquote>
  
  <p>My code is:</p>
  
  <pre><code>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;
  using System.Configuration;
  using MetroFramework;
  
  namespace MAARS_Software.Project
  {
      public partial class frmProductEntry : MetroFramework.Forms.MetroForm
      {
          OleDbConnection con = new 
  OleDbConnection(ConfigurationManager.AppSettings["con"]);
          OleDbConnection conn = new 
  OleDbConnection(@"Provider=Microsoft.ACE.OLEDB.12.0;Data 
  Source=D:\Backup\OneDrive\Documents\Visual Studio 2017\My 
  Projects\Backups\MAARS Software\DataBase.accdb;
  Jet OLEDB: Database Password = 654321");
  
      public frmProductEntry()
      {
          InitializeComponent();
      }
  
      private void frmProductEntry_Load(object sender, EventArgs e)
      {
          ViewData();
      }
  
      private void Save_btn_Click(object sender, EventArgs e)
      {
  
      }
  
      private void Update_btn_Click(object sender, EventArgs e)
      {
  
      }
  
      private void Delete_btn_Click(object sender, EventArgs e)
      {
  
      }
  
      private void Exit_btn_Click(object sender, EventArgs e)
      {
  
      }
      void ViewData()
      {
          OleDbDataAdapter da = new OleDbDataAdapter("Selct * from [Product]", 
  con);
          //DataTable dt = new DataTable();
          //da.Fill(dt);
          DataSet ds = new DataSet();
          da.Fill(ds);                //Error stop here
          dataGridView1.DataSource = ds.Tables[0];
          }
      }
  }
  </code></pre>