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並前往http://qi-u.com/?qa=635006/c%23-an-object-reference-is-required-for-the-non-static-field-method-or-property

An object reference is required for the non-static field, method ...

Is by any chance Form1 the name of the class? You need to have a reference to an instance of the form class. Since okBtn is not on the same ...

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