public JarmuLista() { InitializeComponent(); var colbox = new DataGridViewComboBoxColumn(); using (var db = new JKContext()) { colbox.HeaderText = "Kategória"; colbox.DataSource = db.jarmukategoria.ToList(); colbox.ValueMember = "Id"; colbox.DisplayMember = "kategoriaNev"; } dataGridView1.Columns.RemoveAt(1); dataGridView1.Columns.Insert(1, colbox); }