生成随机字母数字组合

//生成随机字母数字组合
public static string CreateRandom(int codeCount)
{
string allChar = "2,3,4,5,6,7,8,9,a,b,c,d,e,f,g,h,i,j,k,m,n,p,q,r,s,t,u,v,w,x,y,z,A,B,C,D,E,F,G,H,J,K,L,M,N,P,Q,R,S,T,U,V,W,X,Y,Z";

string[] allCharArray = allChar.Split(',');
string randomCode = "";
int temp = -1;
Random random = new Random();
for (int i = 0; i < codeCount; i++)
{
if (temp != -1)
{
random = new Random(i * temp * (int)DateTime.Now.Ticks);
}
int t = random.Next(35);
if (temp == t)
{
return CreateRandom(codeCount);
}
temp = t;
randomCode += allCharArray[temp];
}
return randomCode;
}