public static string RandomStr(int len)
{
string all = "0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z";
string[] allChar = all.Split(',');
string result = "";
System.Random rand = new System.Random();
for (int i = 0; i < len; i++)
{
result += allChar[RandomExt.GenerateValue(0, allChar.Length)];
}
return(result);
}