I am trying to use the DropDownList and find this level of documentation:

 <div class="demo-section k-content">
    <h4>Products</h4>
    @(Html.Kendo().DropDownList()
          .Name("products")
          .DataTextField("ProductName")
          .DataValueField("ProductID")
          .DataSource(source => {
              source.Read(read =>
              {
                  read.Action("GetProducts", "Home");
              }); 
          })
          .HtmlAttributes(new { style = "width: 100%" })
    )
</div>

The only other source file is a simple Controller Action method to return a result. There is no indication of what type of data is to be returned by the read.Action("GetProducts", "Home"); 

What fields are required in the data?
What field or fields are passed back to the Controller on Submit?
Is it JSON?
Is it in a wrapper like the Grid uses?

It is issues like this that make ALL the Telerik products difficult to use, and makes me consider using other tools. I think it lowers the value of the tools when Telerik appear to be happy that documentation of this level exists and users have to find answers and working real life examples on sites such as StackOverflow.