How you will put an icon at the time of folder or file creation

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C#3.5

suppose you have created a folder . And you have an icon . now how you will put that icon on the folder [ at the time of creation of the folder ]....how i change the default look of the folder at creation time
All through code

What I have tried:

during the time of folder creation i used system.io namespace
for folder creation i used createdirectory(path and the name of the folder ) syntax .
After that i don't know i am asking for help