Hey everyone, I am having problems of creating a If statement for my client testimonials on my page. I can get all the values from my custom media item (umbracoFile, clientName, clientTestimonial, Id)

What i want to do is make a if statement where if the client testimonial has a value then display the following html and content. 

Here is my razor script. Ive bold the text to show the problem I am having with

@using umbraco;
@using umbraco.cms.businesslogic.media;

@{
    int mediaId = int.Parse(Parameter.mediaId.ToString());

    Media gallery = new Media(mediaId);

    <div class="clients">
    @foreach (dynamic banner in gallery.Children)
    {

        mediaId = banner.Id;
        string str_image = Model.MediaById(mediaId).umbracoFile;

        string alt = Model.MediaById(mediaId).clientName;
        string click = "click" + Model.MediaById(mediaId).Id;
        string id = "client" + Model.MediaById(mediaId).Id;
        string linkId = "show" + Model.MediaById(mediaId).Id;


        <div class="clientImage">
               <img class="imageClass" id="@id" src="@str_image" tooltip="@alt" border="0" alt="LOGO: @alt" />
        </div>
    }
    </div>
    <div class="content_top"></div>
    <div id="testimonials">
    @foreach (dynamic banner in gallery.Children)
    {
        mediaId = banner.Id;
        string emptytestimonial = Model.MediaById(mediaId).clientTestimonial;
        string clientTestimonial = Model.MediaById(mediaId).clientTestimonial;
        string clientName = Model.MediaById(mediaId).clientName;
        string linkId = "show" + Model.MediaById(mediaId).Id;
        string id = "t_client" + Model.MediaById(mediaId).Id;
        if (emptytestimonial.IsEmpty())
        {



            <div class="itemTest" id="@id">

            <div class="testimonials_top">
                <div class="testmonials_bottom">
                        <div>
                            <p>@clientTestimonial</p>
                            <span>
                                @clientName
                            </span>
                        </div>
                </div>
            </div>

            </div>
        }
    }
    </div>
}

If anyone could help me that would il be most thankful. am still newish to razor, trying to understand the concept of it like and how it works... 

Thanks 

Paul