I have added just one product to the database and can't add it to the cart.The error recorded in the admin log says:-
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>> 06/04/2012 22:45:18
>> DESCRIPTION:
System.InvalidCastException: Conversion from type 'DBNull' to type 'Double' is not valid.
at Microsoft.VisualBasic.CompilerServices.Conversions.ToDouble(Object Value, NumberFormatInfo NumberFormat)
at BasketBLL.LoadBasketItems()
at Templates_BasketView.LoadBasket()
at Templates_BasketView.Page_Load(Object sender, EventArgs e)
at System.Web.UI.Control.LoadRecursive()
at System.Web.UI.Control.LoadRecursive()
at System.Web.UI.Control.LoadRecursive()
at System.Web.UI.Control.LoadRecursive()
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)