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How to generate a random unique 10 digit alphanumeric?

Hello Experts,
Could anybody please post me a code snippet to generate a random and unique 10 digit alphanumeric in C#? I need to insert this 10 digit alphanumeric into a primary key column of a table. Any help is greatly appreciated! Thanks!

guru_sami

check this: http://snipplr.com/view/13357/random-string-generator/

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SaedSalman

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ipjyo

ASKER

Thanks for the codes..I will try them and let you know soon.

Thanks!

ipjyo

ASKER

Hi,
First I am trying the below code. Could you tell me if I need to import any namespace to support RNGCryptoServiceProvider and its methods? because my visual studio is not suppoerting this class.
Can you please clarify?
And also I am not able to understand the following line. Thanks!
result.Append(chars1)>);

private string GetUniqueKey()
  {
  int maxSize  = 10 ;
  int minSize = 10 ;
  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(chars1)>); }
   return result.ToString();
  }

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ipjyo

ASKER

I have added System.Security.Cryptography..now it is showing.
But I still dont get if there is any typo error in this
result.Append(chars1)>);

Thank you!

ipjyo

ASKER

I tried to give
result.Append(chars1);
I have got an error like "there is no chars1 variable defined". When I tried to give it as
result.Append(chars);
it generated a long string as shown below.
Could you please help me what I have missed here.
Thanks!

abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890

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SOLUTION

SaedSalman

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ipjyo

ASKER

The code "http://snipplr.com/view/13357/random-string-generator" is working fine.
Thanks very much guru-sami

ipjyo

ASKER

Hi SaedSalman,

Thank you for working for me..I would also like to save and use your code.

SaedSalman

You are welcom,
> I would also like to save and use your code.
actually not mine ;-)

http://www.codeproject.com/KB/aspnet/UniqueKeys.aspx?display=PrintAll&fid=315463&df=90&mpp=25&noise=3&sort=Position&view=Quick&select=2493319

Best Regards,
Saed Salman