How to make a child node visible = false in a Treeview Control

I'm having a windows form with a tree view control. This tree view has a Root node and 2 child nodes开发者_开发百科. My requirement is i need to hide the first child node. Is it possible to make visible false that particular child nod

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Yes you could inherit from tree node and create your own behaviour. Like so.

public class RootNode : TreeNode
{
    public List<ChildNode> ChildNodes { get; set; }

    public RootNode()
    {
        ChildNodes = new List<ChildNode>();
    }

    public void PopulateChildren()
    {
        this.Nodes.Clear();

        var visibleNodes = 
            ChildNodes
            .Where(x => x.Visible)
            .ToArray();

        this.Nodes.AddRange(visibleNodes);
    }

    //you would use this instead of (Nodes.Add)
    public void AddNode(ChildNode node)
    {
        if (!ChildNodes.Contains(node))
        {
            node.ParentNode = this;
            ChildNodes.Add(node);
            PopulateChildren();
        }
    }

    //you would use this instead of (Nodes.Remove)
    public void RemoveNode(ChildNode node)
    {
        if (ChildNodes.Contains(node))
        {
            node.ParentNode = null;
            ChildNodes.Remove(node);
            PopulateChildren();
        }

    }
}

public class ChildNode : TreeNode
{
    public RootNode ParentNode { get; set; }
    private bool visible;
    public bool Visible { get { return visible; } set { visible = value;OnVisibleChanged(): } }
    private void OnVisibleChanged()
    {
        if (ParentNode != null)
        {
            ParentNode.PopulateChildren();
        }
    }
}

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No, there is no way to make node invisible. You should remove it instead of making invisible. And later you will have to add it back into its original position.

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If you are loading a treeview with a sitemap file, then another approach is to do something like this. Here the user's credentials have been read from a DB and written to a cookie.

    private void ManageTreeMenu()
    {
        var value = Utilities.Cookies.GetCookieValue("IsAdmin");
        bool.TryParse(value, out var isAdmin);

        var dir = Server.MapPath("~");
        File.Delete(dir + "Web.sitemap");
        if (isAdmin)
            File.Copy(dir + "WebAdmin.sitemap", dir + "/Web.sitemap");

        else
            File.Copy(dir + "WebOper.sitemap", dir + "/Web.sitemap");
    }

You'd have to do this again if the user's role was changed in the program. I have only verified this in Visual Studio, not in a deployed web application. Caveat emptor.