How to Store data without using Database and how to retrieve them?

Question

I am parsing the html file to extract tabular information through column names. And I want like let user give the input for column name. And according to that column names t

Answer 1

If you've got-to-choose but a database; then I'd go with Xml, use SAX to parse when file goes larger.

See how to Manipulate XML File Data Using C#

--EDIT--

This is in response to your comment. Lets assume that you have a screen with following controls:

1. TextBox as txtColumnName; when user provides a column name and click on the add button, save it as an xml attribute.
2. ComboBox as cbxColumns; select the current column
3. TextBox as txtValue; when this is provided then save the value in the column selected in the Columns combo.
4. Add Button; you can add delete, update buttons as well.

Please go through the example link, it would help you add/remove/update nodes at runtime. You can comeup with your XmlDatabaseWrapper class that would wrap around all of the CRUD operations.