在sql server 2008中执行存储过程时出错

create procedure spinsert
    @username nvarchar(100),
    @password nvarchar(100),
    @email nvarchar(100)
as
Begin
    Declare @count int
    Declare @returncode int
    Select @count=count(username) from register where username=@username
    if @count>0
      Begin
        Set @returncode=-1
      End
    Else
      Begin
        Set @returncode=1
        Insert into register values(@username,@password,@email)
      End
    Return @returncode as returnvalue
End

我得到这个错误或：

I get this error:

Msg 156, Level 15, State 1, Procedure spinsert, Line 19
Incorrect syntax near the keyword 'as'.