[C#] Struct to Byte-array and back

Setup / Code:
The struct we will send.

[StructLayout(LayoutKind.Sequential, Pack = 1)]
public struct datastruct
{
 [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 10)] // Max length of string
 public string str;
 public float x;
 public float y;
}

This converts the struct into an array of bytes.

public static Byte[] SerializeMessage<T>(T msg) where T : struct
{
 int objsize = Marshal.SizeOf(typeof(T));
 Byte[] ret = new Byte[objsize];
 IntPtr buff = Marshal.AllocHGlobal(objsize);
 Marshal.StructureToPtr(msg, buff, true);
 Marshal.Copy(buff, ret, 0, objsize);
 Marshal.FreeHGlobal(buff);
 return ret;
}

This converts it back into a struct.

public static T DeserializeMsg(Byte[] data) where T : struct 
{
 int objsize = Marshal.SizeOf(typeof(T));
 IntPtr buff = Marshal.AllocHGlobal(objsize);
 Marshal.Copy(data, 0, buff, objsize);
 T retStruct = (T)Marshal.PtrToStructure(buff, typeof(T));
 Marshal.FreeHGlobal(buff);
 return retStruct;
}

Usage:
Struct to byte-array.

yourstruct info = new yourstruct();
info.str= "hej";
info.x = 2;
info.y = 4;
byte[] bytearray = MarshalHelper.MarshalHelper.SerializeMessage<datastruct>(info);

Byte-array to struct.

byte[] data  = bytearray; // from above code
object d = MarshalHelper.MarshalHelper.DeserializeMsg<datastruct>(data);
datastruct ds = (datastruct)d;

"Output"

ds.str = hej
ds.x = 2
ds.y = 4