How to search a text in Nodes of a TreeVew control?

The following methods can help to search a text in Nodes of a TreeView control recursively:

        public TreeNode srchTxtInTreeView(TreeView trvToSrch, String strToSrch) 
        { 
            // check if the treeView is not NULL 
            if (trvToSrch == null) 
                return null; 

            // loop through the nodes in the treeview's root nodes 
            for (int i = 0; i < trvToSrch.Nodes.Count; i++) 
            { 
                TreeNode trvNode = srchTxtInTreeViewNode(trvToSrch.Nodes[i], strToSrch); 
                if (trvNode != null) 
                    return trvNode; 
            } 
            return null; 
        } 

        public TreeNode srchTxtInTreeViewNode(TreeNode trvNode, String strToSrch) 
        { 
            // check if the treeView is not NULL 
            if (trvNode == null) 
                return null; 

            if (trvNode.Text == strToSrch) 
                return trvNode; 

            // loop through the nodes in the treeview's sub nodes 
            for (int i = 0; i < trvNode.Nodes.Count; i++) 
            { 
                // recursive call to itself to check lower level nodes 
                TreeNode retTrvNode = srchTxtInTreeViewNode(trvNode.Nodes[i], strToSrch); 
                if (retTrvNode != null) 
                    return retTrvNode; 
            } 
            return null; 
        } 

To call the method, I tested it by a Button control:

        private void button1_Click(object sender, EventArgs e) 
        { 
            TreeNode retNode = srchTxtInTreeView(this.trvJust4Test, "Hello"); 
            if (retNode != null) 
                MessageBox.Show(retNode.ToString() + "Node Found!"); 
        } 

How to search a text in Nodes of a TreeVew control?