Well, it is kinda complicated to transfer files between the Guest OS and Host Os using the VirtualBox, but i found a simple step to transfer file from Host OS to Guest OS easily.
All you got to do is create a ISO(Image) file in the Host OS which includes the files you want to send to Guest OS. You can use PowerISO or Daemon tools those freely available software, use them to make iso files.
Now lets see how to see open the iso files in guest OS (assuming that you have already created an iso file)
Go to Devices , CD/DVD Devices and click on Virtual CD/DVD Disk files
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A new window appears asking you to choose the disk file, Now navigate it to the destination where the file is and choose the file and hit Enter Key or click open.
Now That worked for me, As it is windows I am checking the files in windows file explorer, the CD is loaded.