Difference between Fill and Return DataTable in VS 2005

When you create a new dataset in Visual Studio 2005, the Table Adapter Configuration Wizard comes up.  It gives you three options:

Fill a DataTable
Return a DataTable
GenerateDBDirectMethods

What are the differences between these three--and especially the first two.  I've looked a bit online and haven't yet found a tutorial that makes enough sense.  Links to other sites or questions that could help me understand are fine.
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trevorhigbee2000Asked:
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crisco96Commented:
Filling a DataTable requires that you already have an instance of the DataTable declared and you pass the Table as an argument to the function for example:
     DataTable dt1 = new DataTable;
     SomeObject.Fill(dt1);
     // do something with the data table now as it has data

Returning a data table doesn't require you to have an instance of DataTable already declared, the function will return a new, filled instance of data table, for example:
     DataTable dt1; //we don't have to declare a new instance
     dt1 = SomeObject.SomeMethod();
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trevorhigbee2000Author Commented:
So why would I want to do one over the other?
What is an example of SomeObject in the first example?
What is an example of SomeObject in the second example?

I'm new to 2.0.  I was thrown onto a 1.1 project about 5 months ago, and have just been learning whatever since then.  The only time I used fill in 1.1 was like this:

Dim ds As New DataSet
Dim da As New SqlDataAdapter("SELECT * FROM Table WHERE special = 0", conn)
da.Fill(ds, "someTableName")

So is 'SomeObject' in your example a data adapter?
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