Incorrect syntax near the keyword 'WHEN' - sql-server

Question

Trying to create a stored procedure to insert or update records depending on a field.
CREATE PROCEDURE [dbo].[usp_InsertorUpdateDB]
#dp_id char(32),
#dv_id char(32),
#em_number char(12),
#email varchar(50),
#emergency_relation char(32),
#option1 char(16),
#status char(20),
#em_id char(35),
#em_title varchar(64),
#date_hired datetime
AS
MERGE [dbo].[em] AS [Target]
USING (SELECT #dp_id, #dv_id , #em_number, #email, #emergency_relation, #option1, #status, #em_id, #em_title, #date_hired)
AS [Source] ([dp_id], [dv_id], [em_number], [email], [emergency_relation], [option1], [status], [em_id], [em_title], [date_hired])
ON [Target].[em_id] = [Source].[em_id]
WHEN MATCHED THEN
UPDATE SET [dp_id] = [Source].[dp_id],
[dv_id] = [Source].[dv_id],
[em_number] = [Source].[em_number],
[email] = [Source].[email],
[emergency_relation] = [Source].[email],
[option1] = [Source].[option1],
[status] = [Source].[status],
[em_id] = [Source].[em_id],
[em_title] = [Source].[em_title],
[date_hired] = [Source].[date_hired],
WHEN NOT MATCHED THEN
INSERT ([dp_id], [dv_id], [em_number], [email], [emergency_relation], [option1], [status], [em_id], [em_title],[date_hired])
VALUES ([Source].[dp_id], [Source].[dv_id], [Source].[em_number], [Source].[email], [Source].[emergency_relation], [Source].[option1], [Source].[status], [Source].[em_id], [Source].[em_title], [Source].[date_hired]);
GO
I am getting error on the line WHEN NOT MATCHED THEN
Incorrect syntax near the keyword 'WHEN'.
I am new to stored procedure and tried to figure it out but couldn't.

Answer 1

You don't want this comma -
UPDATE SET [dp_id] = [Source].[dp_id],
[dv_id] = [Source].[dv_id],
[em_number] = [Source].[em_number],
[email] = [Source].[email],
[emergency_relation] = [Source].[email],
[option1] = [Source].[option1],
[status] = [Source].[status],
[em_id] = [Source].[em_id],
[em_title] = [Source].[em_title],
[date_hired] = [Source].[date_hired]**,**
after [date_hired],