[InvalidCastException: Conversion from type 'DBNull' to type 'String' is not valid.]
Microsoft.VisualBasic.CompilerServices.Conversions.ToString(Object Value) +1307492
e_sirjan.Tquestion_input.Trespond() +258
e_sirjan.Tquestion_input.Page_Load(Object sender, EventArgs e) +249
System.Web.UI.Control.OnLoad(EventArgs e) +97
System.Web.UI.Control.LoadRecursive() +61
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +693
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