Gridview does not show SQL Server database records - asp.net

Question

I'm designing a web system for my fyp.
I use SqlDependency to get table change info from cache.
I used SqlDataAdapter, dataSet and gridview, but it doesn't show any result on screen.
Can you tell me where the problem is in my code?
protected void refresh_Click(object sender, EventArgs e)
{
if (Cache["shipOrders"] == null)
{
gvshipOrders.DataSource = Cache["shipOrders"];
gvshipOrders.DataBind();
lblOrderNotification.Text = "last order recived at " + DateTime.Now.ToString();
}
else
{
string xconnectionString = ConfigurationManager.ConnectionStrings["LGDB"].ToString();
SqlConnection sqlCon = new SqlConnection(xconnectionString);
SqlDataAdapter da = new SqlDataAdapter("viewOrders", sqlCon);
DataSet ds = new DataSet();
da.Fill(ds);
SqlCacheDependency XsqlcacheDependecy = new SqlCacheDependency("secaloTest1", "customerShipOrder");
//caching shipOrders table data
/*
Cache.Insert("shipOrders", ds, null, DateTime.Now.AddSeconds(60), Cache.NoSlidingExpiration, CacheItemPriority.Default, null);
another overloaded method is used */
Cache.Insert("shipOrders", ds, XsqlcacheDependecy);
gvshipOrders.DataSource = ds;
gvshipOrders.DataBind();
lblOrderNotification.Text = "orders retrived from database at " + DateTime.Now.ToString();
}
}

Answer 1

I've found the problem,
public partial class OrderProccessing : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (Session["email"] == null)
{
Response.Redirect("Default.aspx");
}
else
{
string value = Session["email"].ToString();
Classes.AddAddress addcuid = new Classes.AddAddress(value);
txtstaffname.Text = addcuid.addStaffName().ToString();
txtstaffID.Text = addcuid.fetchStaffID().ToString();
}
}
protected void refresh_Click(object sender, EventArgs e)
{
if (Cache["shipOrders"] != null)
{
myGrid.DataSource = Cache["ShipOrders"];
myGrid.DataBind();
lblOrderNotification.Text = "last order recived at " + DateTime.Now.ToString();
}
else
{
string xconnectionString = ConfigurationManager.ConnectionStrings["LGDB"].ToString();
SqlConnection sqlCon = new SqlConnection(xconnectionString);
SqlDataAdapter da = new SqlDataAdapter("viewOrders", sqlCon);
da.SelectCommand.CommandType = CommandType.StoredProcedure;
DataSet ds = new DataSet();
da.Fill(ds);
SqlCacheDependency XsqlcacheDependecy = new SqlCacheDependency("secaloTest1", "customerShipOrder");
//caching shipOrders table data
/*
Cache.Insert("shipOrders", ds, null, DateTime.Now.AddSeconds(60), Cache.NoSlidingExpiration, CacheItemPriority.Default, null);
another overloaded method is used */
Cache.Insert("shipOrders", ds, XsqlcacheDependecy);
myGrid.DataSource = ds;
myGrid.DataBind();
lblOrderNotification.Text = "orders retrived from database at " + DateTime.Now.ToString();
}
}
}