In C#: Add Quotes around string in a comma delimited list of strings

string list = "Fred,Sam,Mike,Sarah";

string newList = "'Fred','Sam','Mike','Sarah'";

int number = 0;
string newList = "";
foreach (string item in list.Split(new char[] {','}))
{
    if (number > 0)
    {
        newList = newList + "," + "'" + item + "'";
    }
    else
    {
        newList = "'" + item + "'";
    }
    number++;
}

string s = "A,B,C";
string replaced = "'"+s.Replace(",", "','")+"'";

string[] bits = list.Split(','); // Param arrays are your friend
for (int i=0; i < bits.Length; i++)
{
    bits[i] = "'" + bits[i] + "'";
}
return string.Join(",", bits);

return list.Split(',').Select(x => "'" + x + "'").JoinStrings(",");

public static string JoinStrings<string>(this IEnumerable<string> source,
                                         string separator)
{
    StringBuilder builder = new StringBuilder();
    bool first = true;
    foreach (T element in source)
    {
        if (first)
        {
            first = false;
        }
        else
        {
            builder.Append(separator);
        }
        builder.Append(element);
    }
    return builder.ToString();
}

string nameList = "Fred,Sam,Mike,Sarah";
string[] names = nameList.Split(',');
string quotedNames = "'" + string.Join("','", names) + "'";

string[] splitList = list.Split(',');
string newList = "'" + string.Join("','", splitList) + "'";

var s = "Fred,Sam,Mike,Sarah";
alert(s.replace(/b/g, "'"));

string list = "Fred,Sam,Mike,Sarah";

string[] splitList = list.Split(',');

for (int i = 0; i < splitList.Length; i++)
    splitList[i] = String.Format("'{0}'", splitList[i]);

string newList = String.Join(",", splitList);

Regex regex = new Regex(
    @"b",
    RegexOptions.ECMAScript
    | RegexOptions.Compiled
    );

string list = "Fred,Sam,Mike,Sarah";
string newList = regex.Replace(list,"'");

string list = "Fred,Sam,Mike,Sarah";
StringBuilder sb = new StringBuilder();

string[] listArray = list.Split(new char[] { ',' });

for (int i = 0; i < listArray.Length; i++)
{
    sb.Append("'").Append(listArray[i]).Append("'");
    if (i != (listArray.Length - 1))
        sb.Append(",");
}
string newList = sb.ToString();
Console.WriteLine(newList);