title: How to check business days in c#
body: <p>My client gave me very diffrent requirement yesterday.</p>
  
  <p>I have one folder at server where thousands of files are comming daily. He want me to write a logic to check dates of file. If files are there in folder from more than 3 business days (Mon to Friday) then he want me to delete those files</p>
  
  <p>Example : If any file created in folder on Saturday then that file should delete on wednesday because inbetween we have Saturday and Sunday that should not count as business days.</p>
  
  <p>My developemnt enviornment is c# .NET 3.5</p>
  
  <p>I thought i should write custom method.</p>
  
  <p>Please help me.</p>