title: Loading a file into memory stream buffer and creating new file with same content and with different filename
body: <p>I don't know whether it is simple or not because i am new to programming.</p>
  
  <p>my requirement is : In my vb.net winform application, the filenames of the files present in "D:\Project"  willbe displayed in DataGridView1 control. Now I want to load these files one after another into memory stream buffer and add the headers("ID","Name","Class") to the content in the file. Then I want to save these files in "C:\" with "_de" as suufix to the filename i.e.,sample_de.csv. </p>
  
  <p>Can anyone please help me? If you need more clarity i can post it in more clear way</p>
  
  <p>Many Thanks for your help in advance.</p>