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Why is this an issue?
Thread.Suspend and Thread.Resume can give unpredictable results, and both methods have been deprecated. Indeed, if
Thread.Suspend is not used very carefully, a thread can be suspended while
holding a lock, thus leading to a deadlock.
There are other synchronization mechanisms that are safer and should be used instead, such as:

  
 Monitor provides a mechanism that synchronizes access to objects. 
  
 Mutex provides a mechanism that synchronizes interprocess access to a protected resource. 
  
 Semaphore provides a mechanism that allows limiting the number of threads that have access to a protected resources concurrently.
  
  
 Events enable a class to notify others when something of interest occurs. 

Resources
Documentation

  
 Thread.Resume Method 
  
 Thread.Suspend Method 
  
 Monitor Class 
  
 Mutex Class 
  
 Semaphore Class 
  
 Events Programming Guide 
  
 lock statement 

Articles & blog posts

  
 Concurrency in C# Cookbook - Stephen Cleary