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Editorial Team
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Asked: 2026-05-13T17:57:06+00:00

I was wondering how I can generate a strong and secure password in C#.

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I was wondering how I can generate a strong and secure password in C#.

I googled a little bit and saw this formula in Wikipedia, where L is the length of the password and N is the number of possible symbols:

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Also, I’ve found this question, but for some reason the method Membership.GeneratePassword just returns a random number with 1 digit, which absolutely no password. All the rest solutions, were very slow (>= 0.5 secs).

I need help implementing this formula (I don’t know where to start). You may also suggest another solution or explain why the GeneratePassword isn’t working.

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1 Answer

  1. Editorial Team

    I just tried the following in linqpad:

    System.Web.Security.Membership.GeneratePassword(25, 10)

    This is the password I got: 

    [XTJ_67g.i/ag1rL)6_Yv>*+%

    Or, if that’s not secure enough, try this:

    System.Web.Security.Membership.GeneratePassword(128, 100)

    which got me the following when running it three times:

    |c^.:?m)#q+(]V;}[Z(})/?-;$]+@!|^/8*_9.$&.&!(?=^!Wx?[@%+&-@b;)>N;&+*w[>$2+_$%l;+h+#zhs^{e?&=*(}X_%|:}]]}*X[+)Er%J/-=;Q0{:+=%c7:^$

/:_)hxF+*){2|;(>:*N^+!_&|}B.$})?[V=[+v({-:-@9-Z$j?.[-}(@MHx+}(}Mz_S(7#4}{..>@G|!+++{+C=|_}=+r^@&$0;L*|kz-;$++/N3$=}?;%&]]*/^#^!+

:*{]-x^$g{|?*))_=B@^.#%L;g|+)#[nq}?y(_(m;]S^I$*q=l-[_/?}&-!k^(+[_{Z|&:^%!_)!=p%=)=wYd-#.UP$%s1{*l%+[%?!c+7=@=.;{+M)!^}&d/]{];(&}

    this took way less than a second, btw. The framework is your friend.

    See http://msdn.microsoft.com/en-us/library/system.web.security.membership.generatepassword.aspx

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