SQL database from c#.net

i haev a problem in my c# program i keep getting an exception
the point of the program is to: Write a Windows form application that displays the items on order for which there is insufficient stock in inventory to process the orders.  When the button is pressed, the following information about out-of-stock items should be displayed: Item number, Item description, Quantity ordered, Quantity on hand.

i created a class invalid that stores the data values nessisary

       private void button1_Click(object sender, EventArgs e)
        {
            int c = 0;
            string sConnection;
            sConnection = "Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=ComputerStore.mdb";

            OleDbConnection dbConn;
            dbConn = new OleDbConnection(sConnection);
            dbConn.Open();



            string s1;
            invalid item;

            s1 = "SELECT Orders.itemID, Sum(Orders.quantity) AS totQuantity ";
            s1 = s1 + "FROM Orders ";
            s1 = s1 + "GROUP BY Orders.itemID ";
            s1 = s1 + "ORDER BY Orders.itemID;";

            OleDbCommand Query1;
            Query1 = new OleDbCommand();
            Query1.CommandText = s1;
            Query1.Connection = dbConn;
            string s2;

            s2 = "SELECT Inventory.itemID, Query1.totQuantity, Inventory.description, Inventory.quantity";
            s2 = s2 + "FROM Query1 INNER JOIN Inventory ON Query1.itemID = Inventory.itemID Where Query1.totQuantity > Inventory.quantity";
            s2 = s2 + "ORDER BY Inventory.itemID;";


            OleDbCommand dbCmd;
            dbCmd = new OleDbCommand();
            dbCmd.CommandText = s2;
            dbCmd.Connection = dbConn;

            OleDbDataReader dbReader;
            dbReader = dbCmd.ExecuteReader();

            while (dbReader.Read())
            {//retrieve records 1-by-1
                c++;
                item = new invalid(c, dbReader["itemID"].ToString(),
                    dbReader["description"].ToString(),
                    dbReader["totQuantity"].ToString(),
                   dbReader["quantity"].ToString());
                this.lstBox.Items.Add(item);
            }
            dbReader.Close();
            dbConn.Close();
        }
}

any halp would be appreciated

But is it Touring complete?

yes?

are you going to tell us what the exception is?

>>4
I believe it is so, as C# is similar to C++, a Touring-complete extension to C.

>>4
Ducks are Touring complete. They move across a (theoretically) infinite river in either direction. They have memory. In each step, they can catch fish, take a dump, or quack.

unsafe class ぬるぽ{
 static int Main(){
  int i=0;
  int *p=(int *)i;
  return *p;
 }
}

>>9
improved version
unsafe class ぬるぽ{
 static int Main(){
  return *(int *)0;
 }
}

^Testing