Compress Files & Foleder in vb.net

Imports java.util.zip
Imports java.io

Public Class ZipUtility
Public Shared Function CreateZip(ByVal FileNames() As String, ByVal ZipFileName As String) As Boolean
'THIS SAMPLE WILL NOT ALLOW THE ZIP FILE TO BE CREATED IF IT ALREADY EXISTS
'MODIFY AS NEEDED, I WILL WORK ON ADDING IN SUPPORT FOR APPENDING AND OVERWRITING
If DoesFileExist(ZipFileName) Then
Throw New IOException("zip file already exists")
Return False
End If
Try
'OUTPUT STREAM THAT WILL WRITE OUT THE ZIP FILE, THIS
Dim MyOutputStream As New ZipOutputStream(New java.io.FileOutputStream(ZipFileName))
'FILE INPUT STEAM
Dim MyFileStream As java.io.FileInputStream
'OUR ZIP ENTRY, ONE FOR EACH FILE
Dim MyZipEntry As ZipEntry
'A BUFFER FOR THE I/O
Dim Buffer(1023) As SByte
'LOOP EACH FILE NAME IN OUR ARRAY
For Each FileName As String In FileNames
'CHECK THAT FILE EXISTS BEFORE TRYING TO INCLUDE IT IN THE ZIP
If DoesFileExist(FileName) Then
'CREATE A NEW ENTRY IN THE ZIP FILE, BASED ON THE FILE NAME
MyZipEntry = New ZipEntry(New IO.FileInfo(FileName).Name)
'SET IT TO DEFLATE (COMPACT IT)
MyZipEntry.setMethod(ZipEntry.DEFLATED)
'STICK THE ENTRY IN THE ZIP FILE
MyOutputStream.putNextEntry(MyZipEntry)
'CREATE A FILE STREAM TO WRITE THE FILE TO THE ZIP
MyFileStream = New java.io.FileInputStream(FileName)
'A COUNTER WHILE WE INPUT THE BUFFER INTO THE FILE
Dim nCount As Integer = 0
'LOOP THE INPUT FILE STREAM AND WRITE IT TO THE ZIP FILE
nCount = MyFileStream.read(Buffer, 0, Buffer.Length)
While nCount > 0
MyOutputStream.write(Buffer, 0, nCount)
nCount = MyFileStream.read(Buffer, 0, Buffer.Length)
End While
'CLOSE THE FILE STREAM FOR THE FILE BEING ZIPPED
MyFileStream.close()
'CLOSE THE ENTRY IN THE ZIP FILE
MyOutputStream.closeEntry()
End If
Next
'ALL DONE, CLOSE THE ZIP FILE
MyOutputStream.close()
'IF WE MADE IT THIS FAR, RETURN TRUE
Return True
Catch ex As Exception
'PASS THE EXCEPTION TO THE CALLING ROUTINE
Throw ex
'RETURN FALSE
Return False
End Try
End Function

you will require to download library to use above functionality