How to write HTML output

Previously I have used Response.Write method to write the html texts to page.  Is there a simpler and faster way to do the same alternatively?  My page basically passes id to the logic which fetches data from DB.  Then the field data is analyzed for a single record and HTML needs to be generated.  Which then should be written to page.  Instead in-page 'if' statements, I wanted to just pass the id to existing function and the return string should be the generated html.  Is there a recommended way to do the same in a better fashion?
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