2 database tables, 1 combo box select field to populate datagridview with selected data

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Hello,
I hve a small simple program I am working on just to get better at a few things and understand a little bit of code better. Its involving c# and SQL.
I have 2 database tables and they have a common field which is ORDERID. I have 2 controls in my C# program a combo box and a datagrid view. I have the combo box populated with all the orderids of one of the tables and I want my program to do this.
When I select a ordered in the combo box I want to populate the datagridview with all the specific orderids of the other table.
This is what I currently have and I was wondering if I can get help with this small simple task.

C#

//this populates the combo box with 1 tables order ids idk if this is the right way tho
public partial class MainWindow : Window
    {
        public static string connectionString= @"Data Source=(LocalDB)\v11.0;AttachDbFilename=|DataDirectory|\CenturionDB.mdf;Integrated Security=True";

        public MainWindow()
        {
            InitializeComponent();

            using (SqlConnection sqlcon = new SqlConnection(connectionString))
            {
                SqlCommand cmd = new SqlCommand("SELECT * FROM [dbo].[Orders]", sqlcon);
                sqlcon.Open();
                SqlDataReader reader = cmd.ExecuteReader();
                while(reader.Read())
                {
                    ddlOrders.Items.Add(reader["OrderID"].ToString());
                }
                reader.Close();
            }
        }
//my database data
INSERT INTO [dbo].[Orders](OrderID, Type, Price) VALUES(1111, 'gG', 1.1)
INSERT INTO [dbo].[Orders](OrderID, Type, Price) VALUES(2222, 'BP', 1.2)
INSERT INTO [dbo].[Orders](OrderID, Type, Price) VALUES(3333, 'gG', 1.3)


INSERT INTO [dbo].[buys]( buysID, OrdersID, item, Type) VALUES(121, 1111, 'Monitor', 'gG')
INSERT INTO [dbo].[buys]( buysID, OrdersID, item, Type) VALUES(122, 1111, 'Keyboard', 'gG')
INSERT INTO [dbo].[buys]( buysID, OrdersID, item, Type) VALUES(131, 2222, 'TV', 'BP')
INSERT INTO [dbo].[buys]( buysID, OrdersID, item, Type) VALUES(132, 2222, 'Speakers', 'BP')
INSERT INTO [dbo].[buys]( buysID, OrdersID, item, Type) VALUES(141, 3333, 'sk8', 'sk8')
INSERT INTO [dbo].[buys]( buysID, OrdersID, item, Type) VALUES(142, 3333, 'bearings', 'sk8')

Posted 7-Feb-15 3:08am

TheBigBearNow

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Kochathu Thomas Tinu · Answer 1 · 2015-02-07T04:26:00

Try this code at the click event of combobox

C#

try{
SqlCommand cmd1=new SqlCommand("Select * from buys where OrdersID="+ddlOrders.SelectedValue+"",sqlcon);
sqlcon.Open();
SqlDataReader readBuys = cmd1.ExecuteReader();
                while(readBuys.Read())
                {
datagridview1.Clear();
datagridview1.DataSource=readbuys;

}

}
catch(Exception exp)
{
}