Datagrid Row Selection

[Shapper]

Hello,

I have a datagrid in my aspx page and the function Get_This() in my
code.

I am trying to do the following:
1. When the mouse clicks anywhere inside a datagrid's row the function
Get_This is called.
2. In the function Get_This the record ID of the selected row should be
available.

Is this possible?
How can I do this?

Thanks,
Miguel