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The PasswordRecovery.SubmitButtonImageUrl property contains the URL of the image to use for the Submit button when the PasswordRecovery.SubmitButtonType property is set to ButtonType.Image.
The PasswordRecovery.SubmitButtonText property is used as the alternative text for the image in browsers that do not display images.
When you use the PasswordRecovery.UserNameTemplate or the PasswordRecovery.QuestionTemplate property, the PasswordRecovery.SubmitButtonImageUrl property has no effect.