c# - Invalid expression term ':' in MVC application -

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just got started asp.net mvc. created first controller

public actionresult index()     {         viewdata["currenttime"] = datetime.now.tostring();         return view();     }

and tried set show currenttime in view like

<%: viewdata["currenttime"] %>

but giving below error:

compiler error message: cs1525: invalid expression term ':'

update: i'm using framework 3.5

the syntax wrong. try

<%= viewdata["currenttime"] %>

instead of 

<%: viewdata["currenttime"] %>

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