Check out example codes for "asp.net membership provider multiple". It will help you in understanding the concepts better.

Code Example 1

// Web.config
<membership defaultProvider="MembershipProvider1">
  <providers>
    <clear/>
    <add name="MembershipProvider1" type="MvcApplication.MembershipProvider1" />
    <add name="MembershipProvider2" type="MvcApplication.MembershipProvider2" />
    <add name="AspNetSqlMembershipProvider"
      type="System.Web.Security.SqlMembershipProvider"      
      connectionStringName="ApplicationServices" />
  </providers>
</membership>


// *.cs
var membershipProvider1 = Membership.Providers["MembershipProvider1"];
membershipProvider1.ValidateUser("Mike", "banana");

var membershipProvider2 = Membership.Providers["MembershipProvider2"];
membershipProvider2.ValidateUser("Mike", "orange");

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