Question

my application is an asp.net MVC; I am using Telerik MVC Tree view to display nodes from a model, it works well, except when a value of one node is null.

here is my TreeView:

<% IEnumerable<MyTreeNode> tree = ViewBag.TreeData.Nodes; %>
<%= Html.Telerik().TreeView().Name("TreeView").BindTo(tree, mappings =>
         {
    mappings.For<MyTreeNode>(binding => binding.ItemDataBound((item, myTreeNode) => {
                                    item.Text = myTreeNode.Text; })
                                    .Children(myTreeNode => myTreeNode.Nodes));
                                   })
  .ClientEvents(events => events.OnSelect("onSelect")) %>

I get the following error (pointing to myTreeNode.Text) “value” cannot be null or empty.

I tried:

  if (!IsNullOrEmpty(item.Text))
     {
      item.Text = myTreeNode.Text;
     }

I get this error: The name ‘IsNullOrEmpty’ does not exist in the current context.

Any suggestions, thanks in advance.

Answer 1

IsNullOrEmpty() is a static method call on a string class.

if(!string.IsNullOrEmpty(item.Text))
{

}