>I have to copy all the files in one directory to another directory including the sub folders using Vb for making a BackUp. As i don't have any function to do that i have to run the xcopy.exe from the command line. Shell function runs the exe but i cannot pass the parameters such as source and destination.
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>Is there any function in VisualBasic to do that? or any other solution.
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>Help me to do this functionality

If you look at the VB's help for the Shell function you will find this for the PathName parameter:
"Name of the program to execute and any required arguments or command-line switches; may include directory or folder and drive."

You just have to aggregate the function an your parameters togheter like in the following example:
Shell "XCOPY.EXE c:\source c:\source\backup"