MD5 hashing in .NET to match PHP

I had a bit of a struggle recently trying to get .NET to hash a string that would match PHPs built in MD5 hashing. Ended up that it was a string encoding issue, heres how I got it to work:

'----------------------------------
' Hash the string to match PHPs MD5
'----------------------------------
Private Function Hash(ByVal value As String) As String
  Dim textBytes As Byte() = System.Text.Encoding.ASCII.GetBytes(value)
  Dim cryptHandler As System.Security.Cryptography.MD5CryptoServiceProvidercryptHandler = New System.Security.Cryptography.MD5CryptoServiceProvider
  Dim hash As Byte() = cryptHandler.ComputeHash(textBytes)
  Return LCase(EncodeHexString(hash))
End Function

'---------------------------------------
' Encode the hex string to match PHP MD5
'---------------------------------------
Public Function EncodeHexString(ByVal array As Byte()) as String
  Dim sb As System.text.StringBuilder = New System.text.StringBuilder(array.Length * 2)
  Dim index As Integer
  For index = 0 To sArray.Length - 1
    sb.AppendFormat("{0:X2}", array(index))
  Next
  Return sb.ToString()
End Function