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The MembershipProvider.MinRequiredNonAlphanumericCharacters property returns the minimum number of special, non-alphabetic characters that must be entered to create a valid password for the System.Web.Security.MembershipProvider object.
The MembershipProvider.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.