ResetPassword method in Telerik Membership

My code:

 public static string GetCurrentUserPassword(string userName)
    {
        MembershipProvider p = (MembershipProvider)Membership.Providers["Default"];     
        MembershipUser obj = Membership.GetUser(userName);
        return obj.ResetPassword();               
    }  

web config :

  <siteMap defaultProvider="SitefinitySiteMap">
            <providers>
                <add name="SitefinitySiteMap" type="Telerik.Sitefinity.Web.SitefinitySiteMap, Telerik.Sitefinity" enablePasswordReset="true" requiresQuestionAndAnswer="false"  taxonomyProvider="OpenAccessDataProvider" pageTaxonomy="Pages" rootNode="FrontendSiteMap" pageProvider="OpenAccessDataProvider"/>
            </providers>
        </siteMap>
        <roleManager enabled="false"/>
        <membership defaultProvider="Default">
            <providers>
                <clear/>
                <add name="Default" type="Telerik.Sitefinity.Security.Data.SitefinityMembershipProvider, Telerik.Sitefinity"  enablePasswordReset="true" requiresQuestionAndAnswer="false"/>
            </providers>
        </membership>