memcpy in C# with different dataType

[bhalgatashish]

Hello Experts,
I am porting a c++ code into c#.There are 2 structures, as explained
below.

// Must be a total of 180 bytes
typedef struct MAINTENANCE_PARAM
{
BYTE bCommand;
BYTE bSubCommand;
USHORT usDataLength;
union // Must be no larger than 176 bytes
{
MyStruct1 myStruct1;
MyStruct2 myStruct2;
BYTE bDummy[176];
} data;
} MAINTENANCE_PARAM;


typedef struct _OCI_PARAM {
SHORT sType; // Size: 2
LONG lValue; // 4
SHORT sScale; // 2
LONG lValueTabIdx; // 4
} OCI_PARAM[OCI_MAXPARAM]; //Size: OCI_MAXPARAM = 15 // (15 * 12 = 180)



My code uses the memcpy in the following fashion.
MAINTENANCE_PARAM maintainanceParam;
OCI_PARAM ociParam

// Copy recieved structure to correct format
memcpy((void*)& maintainanceParam, (void*) ociParam, sizeof(OCI_PARAM));



As I know there is no code for memcpy in the C#. So how can I port the
above code into the C#. I am new to C#. I don't know much regarding
the C#.
I need to copy 180 bytes into another structure with different data type. So can anybody tell me how exactly I can implement the above
line of code in C#.
Thanks in Advance for any help.
Regards,
Ashish