SQL For Loop Not Working

Ive got a gridview of options that the user can select. It displays all the networks that the user is in. When the user clicks "submit" button my code (below) does a loop for every gridview row in the gridview.It finds the checkbox, and the label (the name of the network) if the checkbox is not checked it does nothing (or is supposed to) if it is checked it is meant to add a network link to my database, when the check box is checked the item is entered into the database fine but when the user unchecks the checkbox is still enters it. Any ideas whats going wrong? thanks si!

            foreach (GridViewRow row in GridView1.Rows)
            {
                CheckBox chk = row.Cells[0].FindControl("CheckBox1") as CheckBox;
                Label lbl = row.Cells[0].FindControl("Label7") as Label;
                if (chk.Checked == false)
                {
                    //do nothing cos they arent going in that network.

                }
                else if(chk.Checked == true)
                {   //do something cos its going in the selected network....
                    //get the network id
                    SqlCommand TypeCommand2 = new SqlCommand("SELECT NetworkID FROM Networks WHERE Name = '" + lbl.Text + "'", Connection);
                    Reader = TypeCommand2.ExecuteReader();
                    Reader.Read();
                    networkid = (int)Reader.GetValue(0);
                    Reader.Close();
                    SqlCommand AddNetworks = new SqlCommand("INSERT INTO Networks (ItemID, NetworkID) VALUES ('" + ItemID + "','" + networkid + "')", Connection);
                    AddNetworks.ExecuteNonQuery();

                }
            }