Form authentication using ASP .NET................................

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.NET

Hi,all

i am working on form based authentication (forms authentication);

my requirements:

1). This programming deals with accessing a database and web services. Use Forms authentication in ASP.Net.

2).Ability to create new users with username and password to access the application. Restrict usernames to a length of up to 5 accepting only A-Z, a-z, or 0-9.
i am not able to achieve this requirement

i am using this type of sample code in web.config file ,

<pre lang="xml"><authentication mode="Forms">
      <forms loginUrl="~/Login.aspx"  protection="All" timeout="30" >
        <credentials passwordFormat ="Clear">
          <user name ="qwerty"  password="qwerty"/>
          <user name ="zxcv"  password="zxcv"/>
         
         </credentials>
      </forms>
        </authentication>