c# - Catch "FileNotFoundException" -

i have method folder path of particular file:

string filepath = path.combine(environment.getfolderpath(                environment.specialfolder.mydocuments), "file.txt"); 

and later, use read text in file:

streamreader rdr = new streamreader(filepath); // "c:\users\<user>\documents\file.txt"         string mystring = rdr.readtoend(); 

trouble is, if file doesn't exist, throws filenotfoundexception (obviously). want use if/else catch error, in user can browse find file directly, i'm not sure use verify if filepath valid or not.

for example, can't use:

if (filepath == null) 

because top method retrieve string return value, whether or not valid. how can solve this?

you can use file.exists:-

if(file.exists(filepath)) {   //do } else {  }