C# read CSV files row values

var csvList = new List<string>
{
    "1,test1,112,124",
    "2,test2,113,124",
    "3,test3,132,121"
};

var results = csvList
    // Add a key
    .Select(x => new { csv = x, key = x.Split(new[] { ',' })[3] })
    // filter by key
    .Where(x => x.key.Equals("124"))
    // return original csv
    .Select(x => x.csv);