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View Compilation Error

0_0_33308916_8822.cs(11,1): error CS0246: The type or namespace name 'IPAddress' could not be found (are you missing a using directive or an assembly reference?)
0_0_33308916_8822.cs(11,16): error CS0103: The name 'IPAddress' does not exist in the current context
0_0_33308916_8822.cs(13,34): error CS0246: The type or namespace name 'IPEndPoint' could not be found (are you missing a using directive or an assembly reference?)
0_0_33308916_8822.cs(15,27): error CS0103: The name 'Encoding' does not exist in the current context


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