Sql server error using case -

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i have here query wrote in visual studio using sql server 2010. extension mdf think i'm using sql server. here structure of table.

occupantid int contacttypeid int contactdetail varchar(255) maincontacttype bit

here sql.

select contactdetail.*, contacttype, firstname + ' ' + lastname occupantname,              case when maincontacttype = 1 'yes' else 'no' maincontacttype             contactdetail              inner join occupant on contactdetail.occupantid=occupant.occupantid              inner join contacttype on contactdetail.contacttypeid=contacttype.contacttypeid

i'm getting error incorrect syntax near keyword as

the case-expression must end end:

case when maincontacttype = 1 'yes' else 'no' end maincontacttype

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