public string YeniSifreOlustur(int KarakterSayisi)
{
char[] cr = "abcdefghijklmnopqrstuvwxyz0123456789".ToCharArray();
string result = string.Empty;
Random r = new Random();
for (int i = 0; i < KarakterSayisi; i++)
{
result += cr[r.Next(0, cr.Length - 1)].ToString();
}
return result;
}