private void searchBox_TextChanged(object sender, EventArgs e)
        {
            string        filteredItem = (string)filterBox.SelectedItem;
            string        query        = searchBox.Text;
            DonorsService ds           = new DonorsService();

            if (filteredItem == "Name")
            {
                dataGridView1.DataSource = ds.GetByName(query);
            }
            else if (filteredItem == "Email")
            {
                dataGridView1.DataSource = ds.getDonorListByEmail(query);
            }
            else if (filteredItem == "Phone")
            {
                dataGridView1.DataSource = ds.getDonorListByPhone(query);
            }
            else if (filteredItem == "Blood Group")
            {
                dataGridView1.DataSource = ds.getDonorListByBloodGroup(query);
            }
            else
            {
                MessageBox.Show("Please select a filter to search for");
            }
        }
        private void donorNameBox_TextChanged(object sender, EventArgs e)
        {
            string        name          = donorNameBox.Text;
            DonorsService donorsService = new DonorsService();

            dataGridView1.DataSource = donorsService.GetByName(name);
        }