When Processing large data , my computer becomes idle and c# console application also gets halted.

I am processing the folders and files , the files are being retrieved from the database and 

IO operations are being made on those files.

my application always be taking the lot of time to process all those records.

but when my Pc goes into idle mode , my application also goes into idle mode,

when the next day i login to my pc, the console application starts from there itself.

so kindly help me , not to go away my pc into idle mode, via programatically or via pc Settings.