private void Form1_Load(object sender, EventArgs e) { string str = System.AppDomain.CurrentDomain.BaseDirectory; FileInfo file = new FileInfo("McuConfiglist.xlsx"); string FileFullPath = file.FullName.ToString(); dataGridView1.SelectionMode = DataGridViewSelectionMode.FullRowSelect; jo = JsonManager.OpenFile(".\\mcu\\mcusFeaturesAndDescription.json"); string jstr = JsonManager.Serialize(jo); JsonManager.Save(jo, ".\\mcu\\mcusFeaturesAndDescription1.json"); dt = JsonManager.toDataTable(jstr); dataGridView1.DataSource = dt; for (int i = 0; i < dt.Rows.Count; i++) { comboBox1.Items.Add(dt.Rows[i][0]); } }