private void button4_Click(object sender, EventArgs e)
        {
            DialogResult dialogResult = MessageBox.Show("Delete user.All profile and picture will dissapear.", "Caution", MessageBoxButtons.YesNo);

            if (dialogResult == DialogResult.Yes)
            {
                db.DeleteUser(Int32.Parse(userId));
                db.DeleteAllUserImage(Int32.Parse(userId));
                FillData();
                imageBox7.Image = null;
            }
            else if (dialogResult == DialogResult.No)
            {
                //do something else
            }
        }