Need to make Sum IIF query in linq vb.net -


i new linq , need query linq in vb.net data table

every column setted var char if useful query:

select sum(iif([columnnametocountvalues] in      ('value1','value2','value3')       , [employeid] '[idvalue]'       , [project] '[projectname]',1,0))      total [datatablename];

this query should return integer.

where error , question have tried? have said "this query should return integer." may output got error, isn't it? so, why not change database column data type int


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