private void button3_Click(object sender, EventArgs e)
 {
     btc = new BloodTranfuseController();
     dataGridView1.DataSource = null;
     dataGridView1.DataSource = btc.SearchID(textBox1.Text).Tables[0];
 }
 private void BloodTransfusion_Load(object sender, EventArgs e)
 {
     btc = new BloodTranfuseController();
     dataGridView1.DataSource = btc.AllTransfusion().Tables[0];
 }