Membership Provider Parameters disappear after first request

I am trying to Initialize SQL Membership Provider by code and everything is working fine in the first request only!. When the code below executes again (after refreshing the page for example) I get the following error:

The attribute 'connectionStringName' is missing or empty.

Page Load Code:

MembershipSection membershipSection = (MembershipSection)ConfigurationManager.GetSection("system.web/membership");
string sqlProviderName = "AspNetSqlMembershipProvider";                    
NameValueCollection providerConfig;
providerConfig = membershipSection.Providers[sqlProviderName].Parameters; // returning empty list in the second request  
var _SqlProvider = new SqlMembershipProvider();                    
_SqlProvider.Initialize(sqlProviderName, providerConfig);

Web.config:

<membership defaultProvider="AspNetSqlMembershipProvider">
     <providers>
         <clear />
         <add name="AspNetSqlMembershipProvider" type="System.Web.Security.SqlMembershipProvider" connectionStringName="ConnectionString" enablePasswordRetrieval="true" enablePasswordReset="true" requiresQuestionAndAnswer="false" requiresUniqueEmail="true" passwordFormat="Encrypted" maxInvalidPasswordAttempts="5" passwordAttemptWindow="10" minRequiredPasswordLength="6" minRequiredNonalphanumericCharacters="0" applicationName="/" />
     </providers>
    </membership>

Download Sample Code from attachment tab

https://connect.microsoft.com/VisualStudio/feedback/details/813107/membership-provider-parameters-disappear-after-first-request