Two Simple (I HOPE) SQL Insert() Follow Up Questions:

1. Let's say I have a SqlDataSource named Fred. Say I have a string variable, call it Barney. If I call Fred.Insert(Barney) HOW Does the insert command GET the Barney value and pass it to the SQL Insers string?
 
2. Lets say also in this same insert, I want the user Lets say Batty, who is logged in, to have her username automatically inserted into the table along with her Barney value. What is the method to get a hold of user name that is magically floating around in the session somewhere?
 
All said and done, I'd love for it to work like this: "INSERT INTO [BedRock] ([UserName], [Character] ) VALUES (SomethingThatResolvesToSignedInUserName, SomehtingThatResolvesToStringValueofVariable)
 Table Bedrock
UserName               Character
BettyRubble            'Bam-Bam' 
 
THANKS inadvance fro ANY Help
Dan-Simple and sleepless-Harper