how to search a string in pdf content (C#)?

I have two emergency questions !

1- how to search a string in pdf file (in c#) ?

2- how to insert custom user control (C# controls) to pdf file ?

Stack overflow already has an answer to your first question. Have a look at this : How to programatically search a PDF document in c#

EDIT - and perhaps this : http://www.dotnetspider.com/resources/5046-Search-String-PDF-File.aspx