c# - Searching database with Linq -


i trying search data in datagrid using code sample below. have had working code looking bit different, going use async in coding , have tried sample below, have no idea how change code work correctly.

    private async task btnsearchsysprostock_click(object sender, routedeventargs e)     {         using (dataentities de = new dataentities())         {             list<ssdata> stocksearch = await (from in de.tblsysprostocks                  (a => txtsearchsysprostock.text == string.empty || a.stockcode.contains(txtsearchsysprostock.text)) //the error in line                 select new ssdata                 {                     sid = a.stockid,                     scode = a.stockcode,                     sdescription = a.stockdescription,                     sconvfactaltuom = (float)a.convfactaltuom,                     ...                 }).tolistasync();             dgsysprostock.itemssource = stocksearch;         }     }

i getting following error:

cannot convert lamba expression type 'bool' because not delegate type

can please me code using work. in advance! :)

linq where clause expects bool expression, don't need lambda here :

from in ... txtsearchsysprostock.text == string.empty ||        a.stockcode.contains(txtsearchsysprostock.text) select ...

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