Hot answers tagged web-services
Wiping everything is not a good idea - as @Zakir HC mentioned, you loose the MasterPage Features. That could increase the efforts to migrate and maintain the solution. Additionally: If you modify the page like that the page will be stored in the database and could increase the load (possible but unlikely).
Nothing would go wrong. Your edited aspx page would be rendered as a normal web page (depending on what html code you inserted) but will not inherit the Master Page features (design and layout).
Yes, 0x00000000 means "no error". You'll find a definitive confirmation in the Open Specifications: If an operation completes successfully, the value of the ErrorCode MUST be set to 0x00000000. You'll find the meaning of other codes in the same article.
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