Collection_select

Hi,
i am using one collection select in my application,
and i am trying to set the value which i am selected,but i
unable to fixed it.It always refer to first value.Here is my
code,what is wrong in this code,
and what is the appropriate code.please help.

 <%= collection_select(:employeedetails, :EmpNo,

@emprecord,:EmpNo,:Employee_Name,{:selected=>Employee_Name},{:class =>
“abc”})%>
and in controller::
@emprecord=EmployeeDetails.find_by_sql(“select * from
EmployeeDetails”)

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