how to check a particular word in a text file is available using vb.net

[mary dayana]

i have stored all the elements in a xml file in a text file.i dont want to store all the elements but the distinct values,hence kindly reply

[!NoItAll]

Dim sText as String = my.computer.filesystem.readalltext(myfilename)
'case sensitive search
If sText.contains(myString) then
   'it is in there
Else
   'it is not in there
End if
'case insensitive search
If sText.ToLower.Contains(myString.tolower) then
   'it is in there
Else
   'it is not in there
End if