title: Using Kendo UI AutoComplete to throw error
body: <p>hi i am using kedo ui for my asp.net mvc project i am able to use autocomplete and i am getting products from the database which is working fine but i dont want to select the existing products what should i do if already product is entered into the textbox the it should throw an error </p>
  
  <pre><code>    &lt;%= Html.Kendo().AutoComplete()
        .Name("produciits")
        .DataTextField("ProductName")
        .Filter("contains")
        .DataSource(source =&gt; {
            source.Read(read =&gt;
            {
                read.Action("GetProducts", "Home");
            })
            .ServerFiltering(false);
        })
  %&gt;
  </code></pre>