Question : Re-use generated field in MS SQL Server?

On Microsoft SQL Server 2008, I want to select like this:

1: 2: 3:

Select Field1 = Convert(VarChar(25), 'MyString'), Field2 = Field1

However that generates the error:
Msg 207, Level 16, State 1, Line 3
Invalid column name 'Field1'.

For several views I'm writing, multiple modified/generated fields are instanced multiple times, and I'd like to avoid re-writing the same field generation/modification code.

Thanks!

Answer : Re-use generated field in MS SQL Server?

I also located the system admins guide here:

http://download.support.xerox.com/pub/docs/WC7655_WC7665/userdocs/any-os/en/WC-7655-7665-7675_SAG-final.pdf