c# generate random character code example

Example 1: c# random string

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());
}

Example 2: random character c#

//Random Uppercase letter:
Random rnd = new Random();            
int ascii_index = rnd.Next(65, 91); //ASCII character codes 65-90
char myRandomUpperCase = Convert.ToChar(ascii_index); //produces any char A-Z

//random lowercase letter:
Random rnd2 = new Random();            
int ascii_index2 = rnd2.Next(97, 123); //ASCII character codes 97-123
char myRandomLowerCase = Convert.ToChar(ascii_index2); //produces any char a-z

//Random letter irrespective of case: (search up "random number from 2 different ranges" for explanation)
int i = rnd.Next(1, 3) == 1 ? rnd.Next(65, 91) : rnd.Next(97, 123);
char anyLetter = Convert.ToChar(i);

Example 3: generate random alphanumeric string c#

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

Example 4: generate random string C#

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();
}