c# - String not recognized a timespan -

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hope me this. yesterday code working, after did cleaning stop working , keeps on saying:

string not recognized valid timespan 

        datatable dt = new datatable();         dt = database.getschedule();         timespan amtime;         timespan pmtime;         timespan nntime;         timespan _timenow =  timespan.parse(timenow);          foreach (datarow row in dt.rows)         {             amtime = timespan.parse(row["amintake"].tostring());             pmtime = timespan.parse(row["pmintake"].tostring());             nntime = timespan.parse(row["nnintake"].tostring());              if (amtime == _timenow || pmtime == _timenow || nntime == _timenow)             {                  messagebox.show("drink medicine");             }            else             {                /*do nothing*/             }


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