<rewrite>
      <rules>
        <rule name="Condition2" stopProcessing="true">
          <match url="^(.*)$" ignoreCase="false" />
          <conditions logicalGrouping="MatchAll">
            <add input="{HTTP_HOST}" pattern="^www\.mysite\.ru" />
          </conditions>
          <action type="Redirect" url="http://mysite.ru/{R:1}" redirectType="Permanent" />
        </rule>
        <rule name="Add trailing slash" stopProcessing="true">
          <match url="(.*[^/])$" />
          <conditions>
            <add input="{REQUEST_FILENAME}" matchType="IsFile" negate="true" />
            <add input="{REQUEST_FILENAME}" matchType="IsDirectory" negate="true" />
          </conditions>
          <action type="Redirect" redirectType="Permanent" url="{R:1}/" />
        </rule>
      </rules>
    </rewrite>

        public static void RegisterRoutes(RouteCollection routes)
        {
            routes.LowercaseUrls = true;
            routes.AppendTrailingSlash = true;

            routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

            //...
        }