SQL Server 2008 dbms and Visual Studio

Question

I need to add one more column in gridview as difference of Supplier_Quantity - Store_quantity and that difference should be stored in new column after the supplier_Quantity .

But, when I click on Calculate button column what should I do then ?

I tried the following query:

select 
    Product_Name, Supplier_Quantity, Store_Quantity,
    'DIFFRENCE' = Supplier_Quantity - Store_Quantity 
from 
    relatesupp

but it shows in sql only and as soon as I use it in Visual Studio it doesn't show in gridview.

Answer 1

You can place the code in the button and get the desired result in the datagridview :

string sQuery = "select     Product_Name, Supplier_Quantity, Store_Quantity, Supplier_Quantity - Store_Quantity As 'DIFFRENCE' "
 +"from     relatesupp";
SqlCommand cmd = new SqlCommand(sQuery, con); 
SqlDataReader sdr = cmd.ExecuteReader();
DataTable dt = new DataTable();          
dt.Load(sdr);
dataGridView1 .DataSource = dt;