How to split Entered in textboxes data stored in a table using MVC with LinqToSQL

I have a textbox,I can enter data like this(1.20.1000),I want to split this one into 3 parts Stored in another table in 3 columns and also store same(1.20.1000) values in another table 1 column,

How can i do this perform this 2 operations at a time using MVC with LinqToSql