A query working on sql studio, but doesn't work on C# -

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i have query , results when execute on sql studio:

select teamname, count(*)    nethoz_decision   inner join nethoz_case on nethoz_decision.casedisplayidentifier = nethoz_case.casedisplayidentifier    inner join maintik on maintik.counter = nethoz_case.tikcounter   inner join teams on maintik.teamcounter = teams.counter   nethoz_decision.decisionstatuschangedate between '2015-07-23' , '2015-07-28'   group teamname

but when execute on c# sqlcommand don't result. dataset empty , don't error. thought problem might on date. converting right? 

string date1 = string.format("{0:yyyy-mm-dd}", datetimepicker1.value); string date2 = string.format("{0:yyyy-mm-dd}", datetimepicker2.value.adddays(1));

using sqlcommand , type-safe parameters

const string query = " select teamname, count(*)   nethoz_decision  inner join nethoz_case on nethoz_decision.casedisplayidentifier = nethoz_case.casedisplayidentifier   inner join maintik on maintik.counter = nethoz_case.tikcounter  inner join teams on maintik.teamcounter = teams.counter  nethoz_decision.decisionstatuschangedate between @from , @to  group teamname ";  sqlcommand command = new sqlcommand(query); command.parameters.addwithvalue("@from", datetimepicker1.value); command.parameters.addwithvalue("@to", datetimepicker2.value.adddays(1));

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