how do i write this query for wmic in vb.net it keeps telling me the query is incorrect

can someone tell me what is wrong with this query in vb.net   im trying to use wmic to get file information

dim num as string = "001" ' used to test
querys = "Select * from cim_datafile where drive=''C:'' AND Path = ''\\usr\\comm\\upload\\to_central\\'' AND filename =''invoice.''" & num.ToString()

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