Function in Razor view (@helper in razor)

We can create function in cshtml by using @helper syntax

syntax:
@helper <FunctionName>(paramtype param1)
{
//your custom logic
}
Here the function is same as the one we write in class file except  "@helper" .
This function can be invoked from any where in the view simply like this
@FunctionName(param1);

@helper syntax enables in code reusability
scenario : Following code implements recursive function using @helper in view

@helper Recurson(IEnumerable<Menu> nodes, int? parentId)
{
    if (nodes.Any(n => n.ParentId == parentId))
    {
        <ul>
            @foreach (var node in nodes.Where(n => n.ParentId == parentId))
            {
                <li>
                    @node.Name
                    @Recursion(node.Menus, node.Id)
                </li>
            }
        </ul>
    }
}
        @Recurson(Model.Menus, Model.Id)
   
In Above Code Menu Contains hierarchical data which will be iterated over to generate unordered list of the data.

For Complete working  code please refer to my post : Implementing  JsTree in Asp.net MVC