Async/await C# with Example

See below for a simple example of how to use async/await to do some time intensive stuff in a background process 
while maintaining the option of doing some other stuff that do not need to wait on the time intensive stuff to 
complete. 
However, if you need to work with the result of the time intensive method later, you can do this by awaiting the 
execution. 
public async Task ProcessDataAsync() 
{ 
// Start the time intensive method 
Task task = TimeintensiveMethod(@"PATH_TO_SOME_FILE"); 
//  Control  returns  here  before  TimeintensiveMethod  returns 
Console.WriteLine("You can read this while TimeintensiveMethod is still running."); 
 

// Wait for TimeintensiveMethod to complete and get its result 
int x = await task; 
Console.WriteLine("Count: " + x); 
} 
private async Task TimeintensiveMethod(object file) 
{ 
Console.WriteLine("Start TimeintensiveMethod."); 
//  Do  some  time  intensive  calculations... 
using (StreamReader reader = new StreamReader(file.ToString())) 
{ 
string s = await reader.ReadToEndAsync(); 
for (int i = 0; i < 10000; i++) 
s.GetHashCode(); 
} 
Console.WriteLine("End TimeintensiveMethod."); 
// return something as a "result" 
return new Random().Next(100); 
}