What is wrong in this query

Question

I have a list AllIDs. List AllIDs = new List (); I want to to substring operation on a member field AddressId based on a character _. I am using below LINQ query but getting compilation error: AllIDs= AllIDs.Where(s => s.AddressId.Length >= s.AddressId.IndexOf(_)).Select(s => s.AddressId.Substring(s.AddressId.IndexOf(_))).ToList(); Error: Cannot implicitly convert type 'System.Collections.Generic.List ' to 'System.Collections.Generic.List ' I have a list AllIDs. List AllIDs = new List (); I want to to substring operation on a member field AddressId based on a character _. I am using below LINQ query but getting compilation error: AllIDs= AllIDs.Where(s => s.AddressId.Length >= s.AddressId.IndexOf(_)).Select(s => s.AddressId.Substring(s.AddressId.IndexOf(_))).ToList(); Error: Cannot implicitly convert type 'System.Collections.Generic.List ' to 'System.Collections.Generic.List '

Santhosh Kumar Jayaraman · Answer

try like this public class Emp { public int Id; public string Email; } public class class1 { static void Main() { List emplist = new List (); emplist.Add(new Emp() { Id = 1 Email = san_pnl }); emplist.Add(new Emp() { Id = 2 Email = sant_tpnl }); emplist.Add(new Emp() { Id = 3 Email = santt_ttpnl }); foreach (Emp e in emplist) { e.Email = e.Email.Substring(e.Email.IndexOf(_)); } foreach (Emp e in emplist) { Console.WriteLine(e.Email); } } } This will set my email field to _pnl _tpnl _ttpnl