Writing asp.net Textbox data into Excel form

Writing asp.net Textbox data into Excel form

I have a doubt related to asp.net c#. I am developing a web project, in
which, there is a web form, that has a number of textbox entries and a
submit button.
After entering the data in the textboxes and clicking submit button, all
the data should be read from the Textboxes and inserted in to an Excel
document designed in the form of a "form". The Excel document has
texboxes, which need to be populated from the asp.net webform. How is this
possible ?
I have a concept in mind :- I will upload a copy of the Excel sheet into
the website. When a user filles the form and click on submit, an instance
of the Excel document is called, and data is inserted. After that, the
Excel sheet instance is renamed as "username" and saved somewhere. Is it
possible to create instances of Excel sheetslike this ?
Also, I have a second question. Each of the user is required to fill this
webform. Suppose that a user fills the form on 1st of that month, the web
form will be disabled or hidden to that user for the remaining days, ad
will only become active on the 1st of next month. How is this possible ?