private void preencherDataGrid() { MercadoModel mer = new MercadoModel(); DataTable dt = new DataTable(); dt = mer.trazerInformacoes(); dataGridView1.DataSource = dt; if (dt.Rows.Count > 0) { dataGridView1.Columns["mer_cod"].Visible = false; dataGridView1.Columns["en_cod"].Visible = false; } }