[Solved] How to calculate sum of items in a List using C#

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Give this a try. I assume you’re using a 2D table and not a jagged table.

// Assuming a 2D table and not jagged
List<List<string>> table = new List<List<string>>
{
    new List<string> { "1", "2", "3" },              
    new List<string> { "1", "2", "3" },
    new List<string> { "1", "2", "3" },
    new List<string> { "2", "3", "4" }
};

List<decimal> footerTotals = new List<decimal>();

for (int i = 0; i < table[0].Count; i++)
{
    // Sum the columns
    footerTotals.Add(table.Sum(t => decimal.Parse(t[i])));
}

table.ForEach(row => Console.WriteLine(String.Join("\t", row)));
Console.WriteLine(String.Join("\t", footerTotals));

Results:

1       2       3
1       2       3
1       2       3
2       3       4
5       9       13

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solved How to calculate sum of items in a List> using C#