using System;

using System.Collections.Generic;

using System.Linq;  

​

class Permission {

    public string Name;

}

internal class Program {

    private static void Main(string[] args) {

        List<Permission> permissions = new List<Permission>() { 

            new Permission { Name = "A" }, 

            new Permission { Name = "B" },

            new Permission { Name = "C" },

        };

        foreach (var p in permissions) {

            if (p.Name == "A") {

                permissions.Remove(p);

            }

        }

    }

}

​