<asp:SqlDataSource ID="sda_nw1" runat="server" ConnectionString='<%$ ConnectionStrings:NORTHWIND %> '
SelectCommand="SELECT orders.customerid, ContactName, count(OrderID) as numorders FROM...

What does your textbook say?
These are pretty classic exam questions...

Using references is like adding things to classpath in java.
Many things are there by default.

The C# equivalent of import is "using".

i.e.
using System.Data;

Like Java classpath and...

You have the close inside the read loop. Move it outside the loop.

row = GridView.SelectedRow;

SelectedRow?
Where are you trying to put that? Unless you make someone first select a row before being able to edit it, it isn't the right thing to use.

In...

Okay, can you elaborate on this?
"I cannot, however, get the GV to Edit/Delete a specific column in any row"

What do you mean by "cannot"? Do you get an error? Does it just not update anything?...

Are you using sqldatasource as you need to be doing for GridView to work properly, or are you trying this the "old" way with sqldataadapters, etc?

if(player1)
{
if (
(str11 == "1" && str12 == "1" && str13 == "1") ||
(str21 == "1" && str22 == "1" && str23 == "1") ||
(str31 == "1" && str32 == "1" && str33 == "1")
)
...

C# runs on the web server. It would be pretty dangerous for web applications to just be able to just save files on a client machine whenever they wanted.
You can either prompt the user to click a...

This is actually more complicated than you would think, since each type of control has its own attributes and whatnot.
I think this discussion covered it all pretty well....