private void Form1_Load(object sender, EventArgs e) { cmbCategory.DisplayMember = "KategoriAdi"; cmbCategory.ValueMember = "KategoriID"; cmbSupplier.DisplayMember = "SirketAdi"; cmbSupplier.ValueMember = "TedarikciID"; cmbCategory.DataSource = clientCategory.List(); cmbSupplier.DataSource = clientSupplier.List(); dataGridView1.DataSource = clientProduct.List(); }