C# fill a listbox during the form load event from a Microsoft Access database

private void WStoreSystem_Load(object sender, EventArgs e)
        {
          //////////////////////////////////////////////////////////////////////

            string str = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=D:\\WStoreSystem\\WStoreSystem\\WStoreSystem\\bin\\Debug\\StoreSys.mdb";
            OleDbConnection con = new OleDbConnection(str);
            var dss = new DataSet();
            var adapter = new OleDbDataAdapter("SELECT ProName FROM Products", con);
            con.Open();
            adapter.Fill(dss);
            DataTable dt;
            dt = dss.Tables[0];

            Dictionary<string, string> ProName = new Dictionary<string, string>();



the error is :
Column 'ProductID' does not belong to table Table.
            foreach (DataRow row in dss.Tables[0].Rows)
            {
                ProName.Add(row["ProductID"].ToString(), row["ProName"].ToString()); //Product name is the    key.
            }

            listBox1.DataSource = ProName;
            listBox1.DisplayMember = "Key";
            listBox1.ValueMember = "Key";
            
            con.Close();

         /////////////////////////////////////////////////////////////////////
           
            ProductsClass prod = new ProductsClass();
    
           
            DataSet ds = prod.get();
            
            DGV1.DataSource = ds.Tables[0];
            DGV1.Columns[0].AutoSizeMode = DataGridViewAutoSizeColumnMode.AllCells;
            DGV1.Columns[1].AutoSizeMode = DataGridViewAutoSizeColumnMode.Fill;
            
           
            this.ControlBox = false;