asp.net:如何在自定义Login1_Authenticate中向用户添加角色

<system.web>
  <roleManager enabled="true" defaultProvider="AspNetSqlRoleProvider">
    <providers>
      <clear />
      <add name="AspNetSqlRoleProvider" type="System.Web.Security.SqlRoleProvider" connectionStringName="YourConnectionString" applicationName="YourAppName" />
    </providers>
  </roleManager>
</system.web>

protected void Login1_Authenticate(object sender, AuthenticateEventArgs e)
{
    // 验证用户的身份
    if (YourAuthenticationMethod(Login1.UserName, Login1.Password))
    {
        // 添加用户到角色中
        Roles.AddUserToRole(Login1.UserName, "RoleName");
        
        // 设置验证通过
        e.Authenticated = true;
    }
    else
    {
        // 验证失败
        e.Authenticated = false;
    }
}

protected void Application_Start(object sender, EventArgs e)
{
    // 创建角色
    if (!Roles.RoleExists("RoleName"))
    {
        Roles.CreateRole("RoleName");
    }
}