Mouse over on Root node of a tree view

Question

I am having a treeview with one root node . I have written MouseHoverEvent as follows

private void tvwACH_NodeMouseHover(object sender, TreeNodeMouseHoverEventArgs e)
{

        string strFile = string.Empty;
        if (e.Node.Parent.Text == "FileHeader")
        {
            strFile = e.Node.ToString();

            string str = strFile.Substring(10);
            StringComparison compareType = StringComparison.InvariantCultureIgnoreCase;
            string fileName = Path.GetFileNameWithoutExtension(str);
            string extension = Path.GetExtension(str);
            if (extension.Equals(".txt", compareType))
            {

                StringBuilder osb = new StringBuilder();
                objFileHeader.getFileHeader(str, out osb);
                e.Node.ToolTipText = Convert.ToString(osb);
            }
        }

But if i had my mouse on the root node i am getting an error as null exceptio handled. If i had my mouse hover the root node nothing should be happened. Can any one help me please.

Dorababu Meka · Answer

Hi what you write is correct but simply add your code as follows if ( e . Node . Parent != null && e . Node . Parent . Text == FileHeader ) { // Your code goes here }

Chaitanya · Answer

Thanks it works

Chaitanya · Answer

But on when mouse over root node i am getting the error

Ish Bandhu · Answer

It will work when u nouse move on child node on parent node it will show null