string email = "a@a.com, b@b.com, c@c.com";

string[] emails = email.Split(',');

emails[0] = "a@a.com"
 emails[1] = " b@b.com"
 emails[2] = " c@c.com"

emails[0] = "a@a.com"
 emails[1] = "b@b.com"
 emails[2] = "c@c.com"

string email = "a@a.com, b@b.com, c@c.com";
string[] emails = email.Replace(" ", "").Split(',');

string[] emails = email.Split(new string[] { ", " }, StringSplitOptions.None);
string[] emails = email.Split(new char[] { ' ', ',' }, StringSplitOptions.RemoveEmptyEntries);

var emails = Regex.Split(email, @",s*");

string email = "a@a.com, b@b.com, c@c.com";
string[] emails = email.Split(',');
emails = (from e in emails
          select e.Trim()).ToArray();

emails.Split(',').Select(email => email.Trim()).ToArray()

s*,s*

string[] emails = Regex.Split(email, @"s*,s*");

string[] emails = text.Split(',', StringSplitOptions.RemoveEmptyEntries);
Array.ForEach<string>(emails, x => emails[Array.IndexOf<string>(emails, x)] = x.Trim());