Generating Random Number and String in C#

Here is the updated code. In below method, change size for your range of the number.

private static string RandomString()

{

   int size = 9;

   Random r = new Random();

   string legalChars = "123456789";

   StringBuilder sb = new StringBuilder();

   for (int i = 0; i < size; i++)

     sb.Append(legalChars.Substring(r.Next(0, legalChars.Length - 1), 1));

   return sb.ToString();

}

Copy and paste this method and call RandomString() method from your code.

Make sure you have System.IO namespace defined for StringBuilder class. Random class is defined in System namespace which is included by default.

protected String CreateTemporaryPassword(int intPasswordLength)

Random rndmRandom = new Random();

StringBuilder sbPassword = new StringBuilder();

while (sbPassword.Length < intPasswordLength)

int intRandomValue = 0;

while (intRandomValue == 0)

intRandomValue = rndmRandom.Next(65,90); // UpperCase Letters Only

if (intRandomValue == 73) intRandomValue = 0; // Don't allow "I" because it looks too much like a one (1)

if (intRandomValue == 79) intRandomValue = 0; // Don't allow "O" because it looks too much like a zero (0)

sbPassword.Append((Char)intRandomValue);

return sbPassword.ToString();

thank you very much

sir please,

i'd like to know how to generate serial number of 14 digits that can be stored in database and everytime a number is automatically added when the additional  button is pressed.And that number is similar to serial numbers of telecommunication cards.
thank you for your cooperation
please do'nt late to answer me

I just want to kw . I tried to run the program on isual studio 2008.