How Can I Add A Data That Store In List To Excel After I Add Datagridview 'S Data To It

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C#

Microsoft.Office.Interop.Excel._Application app = new Microsoft.Office.Interop.Excel.Application();
           Microsoft.Office.Interop.Excel._Workbook workbook = app.Workbooks.Add(Type.Missing);
           Microsoft.Office.Interop.Excel._Worksheet worksheet1 = null;
           Microsoft.Office.Interop.Excel._Worksheet worksheet2 = null;
           app.Visible = true;
           worksheet1 = workbook.Sheets["Sheet1"];
           worksheet1 = workbook.ActiveSheet;
           for (int i = 1; i < dataGridView1.Columns.Count + 1; i++)
           {
               worksheet1.Cells[1, i] = dataGridView1.Columns[i - 1].HeaderText;
           }
           for (int i = 0; i < dataGridView1.Rows.Count - 1; i++)
           {
               for (int j = 0; j < dataGridView1.Columns.Count; j++)
               {
                   if (dataGridView1.Rows[i].Cells[j].Value != null)
                   {
                       worksheet1.Cells[i + 2, j + 1] = dataGridView1.Rows[i].Cells[j].Value.ToString();
                   }
                   else
                   {
                       worksheet1.Cells[i + 2, j + 1] = "";
                   }
               }
           }

i got this code from the internet by google and i want ti add a data in list i have to the same excel file can any one help please
if the data i want to add is list<string> aa and list<int> bb ;