Not getting data from Datatable

Question

Hi All, I'm using a gridview where I can select multiple lines, I store the keynames of each line into a DataTable, but having trouble using the DataTable when it comes to activating the selected products.
Here is my code to add items to the DataTable:

 

if (Session["tblSelected"] == null)
{
DataColumn actID = new DataColumn("actID");
actID.DataType = Type.GetType("System.Int32");
tblSelected.Columns.Add(actID);
DataColumn actStatus = new DataColumn("actStatus");
actStatus.DataType = Type.GetType("System.Int32");
tblSelected.Columns.Add(actStatus);
DataColumn prodCode = new DataColumn("prodCode");
prodCode.DataType = Type.GetType("System.Int32");
tblSelected.Columns.Add(prodCode);
DataColumn[] pCol = new DataColumn[1];
pCol[0] = actID;
tblSelected.PrimaryKey = pCol;
}
else
{
tblSelected = (DataTable)Session["tblSelected"];
Session["tblSelected"] = null;
}
DataRow dRow = tblSelected.NewRow();
dRow["actID"] = activationID;
dRow["actStatus"] = activationStatus;
dRow["prodCode"] = productCode;
if (!tblSelected.Rows.Contains(activationID))
{
tblSelected.Rows.Add(dRow);
}
else
{
tblSelected.Rows.Find(activationID).Delete();
}
Session["tblSelected"] = tblSelected;

 
I have defined my DataTable on the top

 

DataTable tblSelected = new DataTable();

 
My button has the following code to look through the table:

 

foreach (DataRow row in tblSelected.Rows)
{
   // My code that activates the products....   
} 

 
Now the problem comes when I go into the foreach loop, it tels me that there are no items in tblSelected.
Anyone has any idea why after I selected a couple of rows, and confirmed they are added to the Datatable that they are not accessable from the button control?