public static string getRandNum(int length)
{
//string str = "0123456789"; //"!@#$%^&*()";
string str2 = "abcdefghijklmnopqrstuvwxyz";
//string str3;
//str3 = (str + str2);
Random random = new Random();
StringBuilder builder = new StringBuilder(length);
int i;
for (i = 0; i <= length - 1; i++)
{
int num2 = random.Next(str2.Length);
builder.Append(str2[num2]);
}
return Convert.ToString(builder);
}