Random Password Generation

The below function will generate random 6 digit alpha numeric string.
It can be used for password generation or to use for CAPTCHA image generation.
Some of the digits and letters are ommited because they look same like "i","o","1","0","I","O".


public string GeneratePassword()
{
string allowedChars = "a,b,c,d,e,f,g,h,j,k,m,n,p,q,r,s,t,u,v,w,x,y,z,";
allowedChars += "A,B,C,D,E,F,G,H,J,K,L,M,N,P,Q,R,S,T,U,V,W,X,Y,Z,";
allowedChars += "2,3,4,5,6,7,8,9";

char[] sep ={ ',' };
string[] arr = allowedChars.Split(sep);

string passwordString = "";
string temp;
Random rand = new Random();
for (int i = 0; i < 6; i++)
{
temp = arr[rand.Next(0, arr.Length)];
passwordString += temp;
}
return passwordString;
}


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