c# populate Label from database using treeview

I'm trying to populate a label when i click on a node in a tree view but it only shows 1 value when i click on a other node it stays the same. this is the code i have

#region Read from database
    private void loadlist()
    {
        cn.Open();
        treeView1.Nodes.Clear();
        cmd.CommandText = "SELECT * FROM Files ORDER BY FileName ASC";

        try
        {
            dr = cmd.ExecuteReader();

            while (dr.Read())
            {
                var paths = new List<string>
                {
                      dr["FileName"].ToString(),
                };
                treeView1.PathSeparator = @"\";
                PopulateTreeView(treeView1, paths, '\\');
                //showMD5.Text = dr["MD5"].ToString();
                //node.Nodes.Add(dr["MD5"].ToString()); //child node
            }
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message, Application.ProductName, MessageBoxButtons.OK, MessageBoxIcon.Error);
        }
        dr.Close();
        cn.Close();
    }

i commented out 2 lines what i have tried. the first one just add's the MD5 values of the files under the current tree. i don't want/need that. the other line adds it as a child of that filename. i don't want that either.

i tried it with

treeView1_NodeMouseClick

and

private void treeView1_AfterSelect(object sender, TreeViewEventArgs e)
    {
        cn.Open();
        cmd.CommandText = "SELECT * FROM Files ORDER BY FileName ASC";
        dr = cmd.ExecuteReader();
        dr.Read();
        showMD5.Text = dr["MD5"].ToString();
        showSHA1.Text = dr["SHA1"].ToString();
        dr.Close();
        cn.Close();
    }

but it only shows the values of the first row in the database.