Check out example codes for "c# list to string". It will help you in understanding the concepts better.
Code Example 1
List<string> names = new List<string>() { "John", "Anna", "Monica" };
string result = string.Join(",", names.ToArray());
Code Example 2
using System.Linq;
string str = list.Aggregate((x, y) => x + ',' + y);
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