read pdf and display in c# forms from oracle BLOB column

Question

i am storing pdf files in oracle table as BLOB . Basically there are two fields one is text and other is BLOB. 

Text stores the information of work order number : wo_no 

BLOB stores the information of pdf or saves pdf file :wo_report 

mow i want to create a form , if i type a wo_no then pdf attached to it should be displayed accordingly.