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To achieve the opposite effect (i.e. cause the condition to evaluate to true when the incoming source IP is not in the specified CIDR range) use the alternate constructor form and specify IpAddressComparisonType.NotIpAddress.
Version: (assembly version)
public Condition NewIpAddressCondition( String ipAddressRange )
The CIDR IP range involved in the policy condition.
Supported in: 4.5, 4.0, 3.5