private void button1_Click(object sender, EventArgs e) { OpenFileDialog ofd = new OpenFileDialog(); string file = System.Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments); ofd.FileName = ""; ofd.Title = "Choose a Document..."; ofd.AddExtension = true; ofd.FilterIndex = 0; ofd.Multiselect = false; ofd.ValidateNames = true; ofd.InitialDirectory = file; ofd.RestoreDirectory = true; if (ofd.ShowDialog() == DialogResult.OK) { BindingSource bs = new BindingSource(); //add columns to the dgv dgv_data_baru.Columns.Add("column_one", "column one"); dgv_data_baru.Columns.Add("column_two", "column_two"); Microsoft.Office.Interop.Excel.Application application = new Microsoft.Offi...