How to generate a Random number using RNGCryptoServiceProvid

We can easily generate a unique Random number by using the inbuilt class "RNGCryptoServiceProvider".For doing this simply add class namespace to the header of the code-behind. using System.Security.Cryptography; write a simple function "GetUniqueKey" private string GetUniqueKey() { int maxSize = 8; int minSize = 5; char[] chars = new char[62]; string a; a = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890"; chars = a.ToCharArray(); int size = maxSize; byte[] data = new byte[1]; RNGCryptoServiceProvider crypto = new RNGCryptoServiceProvider(); crypto.GetNonZeroBytes(data); size = maxSize; data = new byte[size]; crypto.GetNonZeroBytes(data); StringBuilder result = new StringBuilder(size); foreach (byte b in data) { result.Append(chars[b % (chars.Length - 1)]); } return result.ToString(); } and call this function in form load or any event like button. string strTest = GetUniqueKey(); strTest = "BL/2009/" + strTest; Response.Write(strTest); One highlight thing is that we can add any format to this Unique ID in this case "BL/2009" source codes: 1). Design

2). Code Behind using System; using System.Data; using System.Configuration; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Web.UI.HtmlControls; using System.Security.Cryptography; using System.Text; public partial class _Default : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { string strTest = GetUniqueKey(); strTest = "BCL/2009/" + strTest; Response.Write(strTest); } private string GetUniqueKey() { int maxSize = 8; int minSize = 5; char[] chars = new char[62]; string a; a = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890"; chars = a.ToCharArray(); int size = maxSize; byte[] data = new byte[1]; RNGCryptoServiceProvider crypto = new RNGCryptoServiceProvider(); crypto.GetNonZeroBytes(data); size = maxSize; data = new byte[size]; crypto.GetNonZeroBytes(data); StringBuilder result = new StringBuilder(size); foreach (byte b in data) { result.Append(chars[b % (chars.Length - 1)]); } return result.ToString(); } } About the author: Planet Source Code is a place for all developer providing free source codes, articles, complete projects,complete application in PHP, C/C++, Javascript, Visual Basic, Cobol, Pascal, ASP/VBScript, AJAX, SQL, Perl, Python, Ruby, Mobile Development