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The Membership.MinRequiredNonAlphanumericCharacters property returns the minimum number of special, non-alphanumeric characters that must be entered to create a valid password for the membership provider specified in the Membership.Provider property.
The Membership.MinRequiredNonAlphanumericCharacters property value is set in the application configuration using the minRequiredNonAlphanumericCharacters attribute of the membership configuration element.
A non-alphanumeric character is a character for which the char.IsLetterOrDigit(char) method returns false.