Membership Generate Password alphanumeric only password?

string newPassword = Membership.GeneratePassword(15, 0);newPassword = Regex.Replace(newPassword, @"[^a-zA-Z0-9]", m => "9" );

This regular expression will replace all non alphanumeric characters with the numeric character 9.

I realised that there may be ways of doing this. The GUID method is great, except it doesn't mix UPPER and lower case alphabets. In my case it produced lower-case only.

So I decided to use the Regex to remove the non-alphas then substring the results to the length that I needed.

string newPassword = Membership.GeneratePassword(50, 0); newPassword = Regex.Replace(newPassword, @"[^a-zA-Z0-9]", m => ""); newPassword = newPassword.Substring(0, 10);

A simple way to get an 8 character alphanumeric password would be to generate a guid and use that as the basis:

string newPwd = Guid.NewGuid().ToString().Substring(0, 8);

If you need a longer password, just skip over the dash using substrings:

string newPwd = Guid.NewGuid().ToString().Substring(0, 11);newPwd = newPwd.Substring(0, 8) + newPwd.Substring(9, 2); // to skip the dash.

If you want to make sure the first character is alpha, you could just replace it when needed with a fixed string if (newPwd[0] >= '0' && newPwd[0] <= '9')...

I hope someone can find this helpful. :-)