Newbie needs to know simple datagrid answer

I have created and filled a data grid in C#.NET from a sql stored procedure.  The user is to select a row of the displayed data grid and then press a button in order that my program perform further information display of the record selected.  The simple question (that I am embarrassed in not being able to figure out!) is how can my program get the value of one of the cells of the row that is selected.  (I know the index of the row, and I know the column from which to retrieve data, but I don't know how to simply pull the text information out of that cell.

Any help would be most appreciated.

Bonus points and praise if I could know how to present the cells in that column as hot links that a user could just click in order to instruct my program to perform the additional work.

Thanks so much in advance,

Jerry