如何在ASP.Net身份中创建角色和用户？

<configuration>
  <connectionStrings>
    <!-- 配置数据库连接字符串 -->
    <add name="DefaultConnection" connectionString="your_connection_string" providerName="System.Data.SqlClient" />
  </connectionStrings>
  
  <system.web>
    <!-- 配置身份验证和授权 -->
    <authentication mode="Forms">
      <forms loginUrl="~/Account/Login" timeout="2880" />
    </authentication>
    <authorization>
      <deny users="?" />
    </authorization>
    
    <!-- 配置角色和用户管理提供程序 -->
    <roleManager enabled="true" defaultProvider="AspNetSqlRoleProvider">
      <providers>
        <clear />
        <add name="AspNetSqlRoleProvider" type="System.Web.Security.SqlRoleProvider" connectionStringName="DefaultConnection" applicationName="/" />
      </providers>
    </roleManager>
    
    <membership defaultProvider="AspNetSqlMembershipProvider">
      <providers>
        <clear />
        <add name="AspNetSqlMembershipProvider" type="System.Web.Security.SqlMembershipProvider" connectionStringName="DefaultConnection" enablePasswordRetrieval="false" enablePasswordReset="true" requiresQuestionAndAnswer="false" requiresUniqueEmail="false" maxInvalidPasswordAttempts="5" minRequiredPasswordLength="6" minRequiredNonalphanumericCharacters="0" passwordAttemptWindow="10" applicationName="/" />
      </providers>
    </membership>
  </system.web>
</configuration>

if (!Roles.RoleExists("Admin"))
{
    Roles.CreateRole("Admin");
}

Membership.CreateUser("username", "password");

Roles.AddUserToRole("username", "Admin");