how to Save Timepan in sqlserver 2008 using Asp.net 3.5

Question

hello everybody,
I am getting time span paramter from our client apllication(in Asp.net 3.5 using C#).
When i am Saving this Timepan Parameter at Our Backend (Sql server 2008) Using Linq(In WCF Service) it gives following error:
 Unable to cast object of type 'System.TimeSpan' to type 'System.IConvertible'.
My Code is given below:
objsession.s_QuestionMasterTopicInsert(topic.Title, contentId,
Convert.ToDateTime(Time), topic.IsAvailable, ref strRet, ref strRetMsg);
 
// Time(is the time span type  )
//I changed Convert.ToDateTime(Time) to new DateTime(time.Ticks),

objsession.s_QuestionMasterTopicInsert(topic.Title, contentId, new DateTime(time.Ticks), topic.IsAvailable, ref strRet, ref strRetMsg);

But it gives following error:
SqlDateTime overflow. Must be between 1/1/1753 12:00:00 AM and 12/31/9999 11:59:59 PM
Is it Possible to convert  timespan to Datetime?
How should I save timespan at My backend as Datetime Field ?