IF ELSE in SQL Server stored procedure

Perhaps:

CREATE PROCEDURE insertName
@fname,@lname
AS BEGIN
IF NOT EXISTS(SELECT fn,ln FROM names WHERE fn=@fname AND ln=@lname)
INSERT INTO names(fn,ln) VALUES(@fname,@lname)
END

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CREATE PROCEDURE insertName
@fname,@lname
AS
IF NOT EXISTS(SELECT fn,ln FROM names WHERE fn=@fname AND ln=@lname)
BEGIN
INSERT INTO names(fn,ln) VALUES(@fname,@lname)
END

OR

CREATE PROCEDURE insertName
@fname,@lname
AS
IF EXISTS(SELECT fn,ln FROM names WHERE fn=@fname AND ln=@lname)
BEGIN
-- do something here.
END
ELSE
INSERT INTO names(fn,ln) VALUES(@fname,@lname)

generally i prefer this

CREATE PROCEDURE insertName
@id int,
@fname varchar(50),
@lname varchar(50)
AS 


IF EXISTS(SELECT fn,ln FROM names WHERE fn=@fname AND ln=@lname)  
BEGIN  
INSERT INTO names(fn,ln) VALUES(@fname,@lname)  
END
ELSE
BEGIN
   Update names
   Set fn = @fname,
       ln = @lname
   Where id = @id
END

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Thank you very much for the assistance!

If I want somehow to add a message to an ASP label that the row already exists how would I do that? My internet research shows some people use @@rowcount or SELECT 'Already Exists' message after the IF EXISTS but I'm having trouble wrapping my head around how to use that in an ASP lable. Thanks.

Brischoft,
is the 'Data Inserted.' Message obtained through a method like the ExecuteNonQuery? I was thinking of maybe displaying message in asp label if ExecuteNonQuery = 0. Is there a better way?

There should b btr way.bt m not knwing as m cf dev.
Bt if ur query is small then its btr if u just insert through asp.
U cn easily display msg n do validatin.