Append byte array to doc file

I have a byte array. I want to write into a word file(.doc). After writing I want to again write one more byte array into same doc file in a new page. I am using following code but it is over writing the content. I want to append the 2nd byte array to the file keeping the content of the file. Please help me

byte[] byte1 = SomeByteArray1();

byte[] byte2 = SomeByteArray2();

System.IO.File.WriteAllBytes(Server.MapPath("~/Folder/filename.doc"), byte1);

System.IO.File.WriteAllBytes(Server.MapPath("~/Folder/filename.doc"), byte2);

The result is it is writng only byte2 array. I want to write the byte2 array in a new page in same doc file. Please help me how to fix this.
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RobOwner (Aidellio)Commented:
You can't do it that way... if you have a look at the MSDN API for the WriteAllBytes function you'll see that the file is overwritten each time:
Creates a new file, writes the specified byte array to the file, and then closes the file. If the target file already exists, it is overwritten.

The only way I can think of at this stage is to combine the two byte arrays into one using the Array.Copy or Buffer.BlockCopy and then write the new byte array

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