vb.net - How to check button is enabled or disabled in selenium -

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i trying check whether button enabled or disabled. doing following

assert.istrue(browser.iseditable(button))

but gives me error expression not produce value. 1 know how achieve this. using vs2010 mstest in vb.net.

can assert presence of "disabled" property of button?

assert.istrue(selenium.iselementpresent("css=input[disabled]"));

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