String to byte array value

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C#3.5

hi,

I have a database field varbinary which I am retrieving in c# and storing in a list. on button click I am passing a authnum value and storing the value in val.

var authval = from authlt in lstarray
                          where authlt.AuthNum == authnum
                          select authlt.authLetter;

i tried opening a pdf by giving the authval to binary writer so that a new window in which pdf will appear. but its not working. it is asking me to give a byte array which i am unable to get from the string value.

is there a way to copy all the string char by char into byte array???
any other way to display pdf from the string?



any help is appreciated.