How to create a sub directory in a blob container

for example,

in my blob container http://veda.blob.core.windows.net/document/

If I store some files it will be

http://veda.blob.core.windows.net/document/1.txt

http://veda.blob.core.windows.net/document/2.txt

Now, how to create a sub directory

http://veda.blob.core.windows.net/document/folder/

So that I can store files

http://veda.blob.core.windows.net/document/folder/1.txt

c# azure directory azure-blob-storage
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