Dot Net and Salesforce API

I have a module in Dot net and also an account in salesforce. I am trying to link both of these together. I have a page in Dot Net where the registration of the logged in candidate takes place. I have an account in salesforce.com.I have created an object which has the respective fields of teh candidate registration page. Now the requirement is as follows:
1) when the user registers in  the dot net page the salesforce module must also be reflected i.e. on the click of the submit button the table in the database as well as the object in the salesforce must have the changes reflected.
By entering the registration details of the candidate ,the salesforce API must also include the values