How to Use XML as a complete database

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C#3.0

C#

XML

Hi All,

I am creating an application that may need some tables on which some queries might need to be executed. I was thinking of creating this without the use of any external engines like SQL server or MYSQL, and I think the best way would be xml data. So, my question is

1) can I perform the operations of simple sql queries in XML??
2) what do I need to do. Some people suggested to use data table, export it into XML files and save while exiting, and for loading, we need to create a data-table and load the data from XMl into it. Is it efficient way to do this??
3) is there any other efficient way in which I can save the data.For security, I thought of encrypting the xml files using RSA after saving and decrypting them while loading. Is this OK???

You can add and ping me at [removed]@gmail.com .

Thanks
Jashobanta