private void buttonSaveMedicine_Click(object sender, EventArgs e) { string mName = textBoxMName.Text; string mGName = textBoxGName.Text; Double mPrice = Convert.ToDouble(textBoxMPrice.Text); int mQuantity = Convert.ToInt32(textBoxMQuantity.Text); medicine.AddMedicine(mName, mGName, mPrice, mQuantity); MessageBox.Show("Medicine Added succesfully"); }