Generating a strong password in C#?

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