[InvalidCastException: Conversion from type 'DBNull' to type 'String' is not valid.]
Microsoft.VisualBasic.CompilerServices.Conversions.ToString(Object Value) +1113
ASP.bookview_aspx.__DataBinding__control9(Object sender, EventArgs e) in C:\HostingSpaces\ketabcity.com\httpdocs\bookview.aspx:106
System.Web.UI.Control.OnDataBinding(EventArgs e) +100
System.Web.UI.Control.DataBind(Boolean raiseOnDataBinding) +178
System.Web.UI.Control.DataBindChildren() +248
System.Web.UI.Control.DataBind(Boolean raiseOnDataBinding) +195
System.Web.UI.Control.DataBindChildren() +248
System.Web.UI.Control.DataBind(Boolean raiseOnDataBinding) +195
System.Web.UI.WebControls.DataList.CreateItem(Int32 itemIndex, ListItemType itemType, Boolean dataBind, Object dataItem) +175
System.Web.UI.WebControls.DataList.CreateControlHierarchy(Boolean useDataSource) +885
System.Web.UI.WebControls.BaseDataList.OnDataBinding(EventArgs e) +89
System.Web.UI.WebControls.BaseDataList.EnsureDataBound() +86
System.Web.UI.Control.EnsureChildControls() +107
System.Web.UI.Control.PreRenderRecursiveInternal() +58
System.Web.UI.Control.PreRenderRecursiveInternal() +227
System.Web.UI.Control.PreRenderRecursiveInternal() +227
System.Web.UI.Control.PreRenderRecursiveInternal() +227
System.Web.UI.Control.PreRenderRecursiveInternal() +227
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3671
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