Generate Random Code

Import below into your Namespace

using System.Security.Cryptography;

Declare Below Variables

public const string Alpha = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
public const string AlphaNumeric = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890";
public const string Numeric = "1234567890";

Create a Enum as below

public enum StringType { Alpha, AplhaNumeric, Numeric }

Create a Method as below

public static string GenerateRandomCode(int CodeSize, StringType objStringType)
        {
            string RandomCode = string.Empty;
            try
            {
                char[] chars = new char[62];
                if (objStringType == StringType.AplhaNumeric)
                    chars = AlphaNumeric.ToCharArray();
                else if (objStringType == StringType.Numeric)
                    chars = Numeric.ToCharArray();

                byte[] data = new byte[1];
                RNGCryptoServiceProvider crypto = new RNGCryptoServiceProvider();
                crypto.GetNonZeroBytes(data);
                data = new byte[CodeSize];
                crypto.GetNonZeroBytes(data);
                StringBuilder result = new StringBuilder(CodeSize);
                foreach (byte b in data)
                    result.Append(chars[b % (chars.Length - 1)]);
                RandomCode = result.ToString();
            }
            catch (Exception ex)
            {
                //throw ex;
            }
            return RandomCode;
        }

You can call the method using below code

Response.Write(GenerateRandomCode(4, StringType.Numeric));

Reference: Muthukumar (http://nadarmuthukumar.blogspot.in)
Hope you liked this and let me know your thoughts on post through your comments :)

Posted in: Asp.Net,C#