I think bit fields are not possible in c# structure. It is possible in c++. Code: typedef struct { UINT16 SrcPort:16; UINT16 DstPort:16; UINT32 SeqNum:32; UINT32 AckNum:16; UINT16 Reserved1:4; UINT16 HdrLength:4; }IP_HDR How can we create a structure like this in c# with bit fields? My question is how we can set bit fields in C# structure.Is there any ways to do it in C#?