runatserver - Why does ASP.NET webforms need the Runat="Server" attribute? -

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why have specify runat="server" on asp.net controls when mandatory attribute , server option available in limited knowledge of asp.net, , error if don't use it?

i understand can optionally use on html tags, , understand client/server paradigm , specifying.

is redundant tag implied control being asp.net control, or there underlying reason?

i've believed there more understanding can mix asp.net tags , html tags, , html tags have option of either being runat="server" or not. doesn't hurt leave tag in, , causes compiler error take out. more things imply web language, less easy budding programmer come in , learn it. that's reason verbose tag attributes.

this conversation had on mike schinkel's blog between himself , talbot crowell of microsoft national services. relevant information below (first paragraph paraphrased due grammatical errors in source):

[...] importance of <runat="server"> more consistency , extensibility.

if developer has mark tags (viz. <asp: />) asp.net engine ignore, there's potential issue of namespace collisions among tags , future enhancements. requiring <runat="server"> attribute, negated.

it continues:

if <runat=client> required client-side tags, parser need parse tags , strip out <runat=client> part.

he continues:

currently, if guess correct, parser ignores text (tags or no tags) unless tag runat=server attribute or “<%” prefix or ssi “<!– #include… (...) also, since asp.net designed allow separation of web designers (foo.aspx) web developers (foo.aspx.vb), web designers can use own web designer tools place html , client-side javascript without having know asp.net specific tags or attributes.


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