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static extern int AddIPAddress(int Address, int IpMask, int IfIndex,

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Declare Function AddIPAddress Lib "iphlpapi.dll" (TODO) As TODO

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      [DllImport("iphlpapi.dll", EntryPoint = "AddIPAddress", SetLastError = true)]

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        private static extern UInt32 MyAddIPAddress( UInt32 Address, UInt32 IpMaskint, int IfIndex,

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        AddIPAddress("1.1.100.2", "255.255.0.0", 2);

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      public void AddIPAddress(String IPAddress, String SubnetMask, int ifIndex)

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        UInt32 Result =  MyAddIPAddress((uint)IPAdd.Address,

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Documentation

[AddIPAddress] on MSDN