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Linq deferred execution
//Prepare test data. Could be a set returned
//from a database query
var list = new List<int>();
for (int i = 0; i < 1000000; i++)
//Filter out a small subset of the data [zip code, annual income]
var listSmall = list.Where(i => i > 100000 && i < 150000);
//Now use the small subset and loop through it
//E.g. examine the first 1000 rows
var result = new List<int>();
for (int i = 0; i < 1000; i++)
int _i = listSmall.Where(o => o == 100100 + i).Single();
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