Tell Me Where To Write Stored Procedure I Am Using Microsoft Sql Server (Sqlclient).

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C#

and server name is ./sqlexpress

i know the program but don,t know actually where to write
actually i am creating stored procedure for checking existing data
when i write code on click of button it is giving me error of missing namespace or directive.
where to write stored procedure program

create procedure usp_QuestionAnswer
{
@question_id int=0 ,
@student_id int =0,
@answer varchar(500)=null
}
AS BEGIN
if not exists(select question_id from Answer where question_id = @question_id  and  student_id =@student_id  ) begin
   insert into Answer(question_id ,student_id,student_answer)
   values(@question_id ,@student_id,@student_answer)
 
end
 
END