Script Component–Source Part2 Retain last record

So keeping my focus on SSIS Script Component as Source I show another example. Mostly Script component is needed when source is Flat file and we need to retain the previous record value(s) to be used in the next record(s). Keeping this in mind I present the scenario:

The source file layout

1,1
2,1
3,0
4,1
5,0
6,0
7,1

Requirement: Add a third column to data and the values need to be set base on the existing 2 columns. If Column 2 value 1 set column 3 as Column 1, else set Column 3 value to the Column 1 value of the previous record.

Expected Output:

Col1 Col2 Col3
1 1 1
2 1 2
3 0 2
4 1 4
5 0 4
6 0 4
7 1 7

Output:

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