random functions

[vishalgupta]

coding in c#....i generate random numbers by random.next and also random string by calling random.next and taking its ascci value...but when i call the functions againa and again in my program the random funcitons always return the same number or the same stirng....y so??? and how can i get different values whenever i call the rando\m functions??

[kenobewan]

Show us your relevant code. Thanks.

[vishalgupta]

i m using the following code:

private string RandomString(int size)
{
StringBuilder builder = new StringBuilder();
Random random = new Random();
char ch ;
for(int i=0; i<size; i++)
{
ch = Convert.ToChar(Convert.ToInt32(Math.Floor(26 * random.NextDouble() + 65))) ;
builder.Append(ch);
}
return builder.ToString();
}

now i have made an aspx and wi calll this function many times but everytime it returns the same random string generated......unless i reload the page.why??

[Shashi Sadasivan]

change your code from

Random r = new Random();

to

Random r = new Random(DateTime.Now.Millisecond);