Random Letters and Number combined.

Question

Using ASP.net (4) with C# (2008 & 2010) also Silverlight

Hello Everyone!

I would like to generate a combination of random letters and numbers.
I need 3 of each that must not be duplicated at any time.
The desired result would look something like "ABC123" when output to a label.

Thanks in advance for your input

Don Taylor

Vulpes · Answer

Try the following (done as a console app for testing purposes): using System; using System.Collections.Generic; class Test { static void Main() { string result = GenerateRandomAlphanumerics(); Console.WriteLine(result); Console.ReadKey(); } static Random rand = new Random(); static string GenerateRandomAlphanumerics() { List list = new List (); int count = 0; while (count { char next = (char)rand.Next(65, 91); // endpoint needs to be one more than 'Z' if (!list.Contains(next)) { list.Add(next); count++; } } count = 0; while (count { char next = (char)rand.Next(48, 58); // endpoint needs to be one more than '9' if (!list.Contains(next)) { list.Add(next); count++; } } return new string(list.ToArray()); } }

Crish · Answer

int a; string oustr=""; for(int i=0;i { val=rnd.Next(0,62); if(val outstr+=(char)(val+'a'); else if(val outstr+=(char)('A' + (val + 'a')); else { outstr+=(char)('o' + (val-52)); } } http://www.axistechnolabs.com/technology/ecommerce-development.aspx]ecommerce development company[/url]

Vulpes · Answer

You'll need to make one or two changes for ASP.NET. If your button is called Button1 and label is called Label1, trying placing this code in your code behind file: public partial class _Default : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { } public string GenerateRandomAlphanumerics() // change to public instance rather than private static { Random rand = new Random(); // put this line in here - don't now need the static field List list = new List (); int count = 0; while (count { char next = (char)rand.Next(65, 91); // endpoint needs to be one more than 'Z' if (!list.Contains(next)) { list.Add(next); count++; } } count = 0; while (count { char next = (char)rand.Next(48, 58); // endpoint needs to be one more than '9' if (!list.Contains(next)) { list.Add(next); count++; } } return new string(list.ToArray()); } protected void Button1_Click(object sender, EventArgs e) { Label1.Text = GenerateRandomAlphanumerics(); } }

don taylor · Answer

Dear Vulpes Thank you for the code, it works fine as a console aplication. How would I output this to a label in Visual studio. I have tried putting a button and a label on a form but VS just sends me round and round with errors. Thanks again Regards Don Taylor.

Random Letters and Number combined.

Answers (4)