generate random string C#

                                    Namespace: System.Web.Security
public string GeneratePassword()
{
	return Membership.GeneratePassword(10,1);
}

                                    Random rnd = new Random();
int month  = rnd.Next(1, 13);  // creates a number between 1 and 12
int dice   = rnd.Next(1, 7);   // creates a number between 1 and 6
int card   = rnd.Next(52);     // creates a number between 0 and 51

                                    private static Random random = new Random();

public static string RandomString(int length)
{
    const string chars = "AaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPpQqRrSsTtUuVvWwXxYyZz0123456789";
    return new string(Enumerable.Repeat(chars, length)
      .Select(s => s[random.Next(s.Length)]).ToArray());
}

public static string[] RandomStrings_Type1(int strLength, int arraySize)
{
	const string chars = "AaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPpQqRrSsTtUuVvWwXxYyZz0123456789";
  	string[] strArray = new string[arraySize];
    for (int i = 0; i < strArray.Length; i++)
    {
  		string randomString = new string(Enumerable.Repeat(chars, length)
                                     .Select(s => s[random.Next(s.Length)]).ToArray());
      	strArray[i] = randomString;
    }
  	return strArray;
}

public static List<string> RandomStrings_Type2(int strLength, int listSize)
{
	return RandomStrings_Type1(strLength, listSize).ToList();
}

                                    private static Random random = new Random();
public static string RandomString(int length)
{
    const string chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
    return new string(Enumerable.Repeat(chars, length)
      .Select(s => s[random.Next(s.Length)]).ToArray());
}