I have this List<object[]>

List<object[]> olst = new List<object[]>();

olst.Add(new object[] { "AA1", 1 });
olst.Add(new object[] { "AA2", 1 });
olst.Add(new object[] { "AA2", 1 });
olst.Add(new object[] { "AA1", 1 });
olst.Add(new object[] { "AA1", 1 });

From olst, I need to produce a new List<object> to hold this:

"AA1", 3
"AA2", 2

In other words, I need to group olst[x][0] and sum up olst[x][1].
I could use a for loop, but I was hoping someone could help me using lambda expressions and/or linq to accomplish this.

c# linq lambda
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