How to return the ID of the Inserted Record to C#

How to return the ID of the Inserted Record to C#

I have this stored procedure:
Insert into dbo.file_row (file_sub_type) values (@file_sub_type)
DECLARE @result int;
SET @result = SCOPE_IDENTITY()
RETURN @result;
This works fine to return the id in SSMS. However, when I call it from C#,
it returns -1.
var connection = GetSqlConnection();
connection.Open();
SqlCommand command = new SqlCommand();
command.Connection = connection;
command.CommandType = CommandType.StoredProcedure;
command.CommandText = "InsertInto_file_row";
command.Parameters.Add(new SqlParameter("@file_sub_type", fileType));
int result = command.ExecuteNonQuery();
connection.Close();
return result;
I don't see what I am doing wrong. I just need the Id of the inserted record.
Greg