System.InvalidCastException: Cast from type 'DBNull' to type 'String' is not valid.
at Microsoft.VisualBasic.CompilerServices.StringType.FromObject(Object Value)
at ASP.listused_aspx.__DataBind__control6(Object sender, EventArgs e)
at System.Web.UI.Control.OnDataBinding(EventArgs e)
at System.Web.UI.Control.DataBind()
at System.Web.UI.Control.DataBind()
at System.Web.UI.WebControls.DataList.CreateItem(Int32 itemIndex, ListItemType itemType, Boolean dataBind, Object dataItem)
at System.Web.UI.WebControls.DataList.CreateControlHierarchy(Boolean useDataSource)
at System.Web.UI.WebControls.BaseDataList.OnDataBinding(EventArgs e)
at System.Web.UI.WebControls.BaseDataList.DataBind()
at InventoryList._BindList(String nu)
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