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remove quote from list<string> using linq
List<string> strings = new List<string>();
strings.Add("'Value1");
strings.Add("'Values2 This 2nd ' should stay");

strings.ForEach(s => s = s.TrimStart('''));

List<string> strings = new List<string>();
strings.Add("'Value1");
strings.Add("'Values2 This 2nd ' should stay");

Console.WriteLine("Before:");
foreach (string s in strings) {
    Console.WriteLine(s);
}

strings.ForEach(s => s = s.TrimStart('''));

Console.WriteLine();
Console.WriteLine("After:");
foreach (string s in strings) {
    Console.WriteLine(s);
}
Console.ReadKey();

Before:
'Value1
'Values2 This 2nd ' should stay

After:
'Value1
'Values2 This 2nd ' should stay

strings = strings.Select(x => x.StartsWith("'") ? x.Substring(1) : x).ToList();

strings.Select(s => s.StartsWith("'") ? s.Substring(1) : s);

var result = strings.Select(s => s.TrimStart('''));

strings.Add("'Value1".TrimStart('''));