When using .NET and C#, IP Address information is stored in the System.Net.IPAddress class, which provides no method for comparing IP addresses except for equality. Learn to circumvent that problem.
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Use the DNS class to resolve host names to IP addresses. Also resolve host names from IP addresses where available.
This trace utility written in C#, traces the path of an IP packet.
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Finish this two-part article and create a color picker app for .NET. Examples are both in C# and VB.NET.
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