Convert .txt file to .xls file in c# 2012

Microsoft.Office.Interop.Excel.Application oXL;
Microsoft.Office.Interop.Excel._Workbook oWB;
Microsoft.Office.Interop.Excel._Worksheet oSheet;
Microsoft.Office.Interop.Excel.Range oRng;
object misvalue = System.Reflection.Missing.Value;
try
{
    //Start Excel and get Application object.
    oXL = new Microsoft.Office.Interop.Excel.Application();
    oXL.Visible = true;

    //Get a new workbook.
    oWB = (Microsoft.Office.Interop.Excel._Workbook)(oXL.Workbooks.Add(""));
    oSheet = (Microsoft.Office.Interop.Excel._Worksheet)oWB.ActiveSheet;

    //Add table headers going cell by cell.
    oSheet.Cells[1, 1] = "First Name";
    oSheet.Cells[1, 2] = "Last Name";
    oSheet.Cells[1, 3] = "Full Name";
    oSheet.Cells[1, 4] = "Salary";

    //Format A1:D1 as bold, vertical alignment = center.
    oSheet.get_Range("A1", "D1").Font.Bold = true;
    oSheet.get_Range("A1", "D1").VerticalAlignment =
        Microsoft.Office.Interop.Excel.XlVAlign.xlVAlignCenter;

    // Create an array to multiple values at once.
    string[,] saNames = new string[5, 2];

    saNames[0, 0] = "John";
    saNames[0, 1] = "Smith";
    saNames[1, 0] = "Tom";

    saNames[4, 1] = "Johnson";

    //Fill A2:B6 with an array of values (First and Last Names).
    oSheet.get_Range("A2", "B6").Value2 = saNames;

    //Fill C2:C6 with a relative formula (=A2 & " " & B2).
    oRng = oSheet.get_Range("C2", "C6");
    oRng.Formula = "=A2 & \" \" & B2";

    //Fill D2:D6 with a formula(=RAND()*100000) and apply format.
    oRng = oSheet.get_Range("D2", "D6");
    oRng.Formula = "=RAND()*100000";
    oRng.NumberFormat = "$0.00";

    //AutoFit columns A:D.
    oRng = oSheet.get_Range("A1", "D1");
    oRng.EntireColumn.AutoFit();

    oXL.Visible = false;
    oXL.UserControl = false;
    oWB.SaveAs("c:\\test\\test505.xls", Microsoft.Office.Interop.Excel.XlFileFormat.xlWorkbookDefault, Type.Missing, Type.Missing,
        false, false, Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlNoChange,
        Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing);

    oWB.Close();

public static void WriteExcel(DataRow drRow, string outputFilePath, string sheetName)
{
     try
     {
          #region Write Headers to Excel file

          objApp.Visible = true;
          objApp.DisplayAlerts = false;
 
          if (!string.IsNullOrEmpty(outputFilePath) && !File.Exists(outputFilePath))
          {
              //create workbook with sheet

              #region create excel sheet
              objWrkbook = objApp.Workbooks.Add(1);

              objWrkSheet = (Excel.Worksheet)objWrkbook.ActiveSheet;
              objWrkSheet.Name = "Sheet1";

              #endregion
          }
          else
          {
               //open workbook with sheet
               #region open excel sheet
               objWrkbook = objApp.Workbooks.Open(outputFilePath, 0, false, 5, "", "", false, Microsoft.Office.Interop.Excel.XlPlatform.xlWindows, "", true, false, 0, true, false, false);

               #endregion
           }

           objSheets = (Excel.Sheets)objWrkbook.Worksheets;
      
          //open the specific sheet in the workbook

           objWrkSheet = (Microsoft.Office.Interop.Excel.Worksheet)objSheets.get_Item(sheetName);

           int colcnt = objWrkSheet.UsedRange.Columns.Count;
           int rowcnt = objWrkSheet.UsedRange.Rows.Count;

           // write columns to the excel sheet
           #region create headers to excel
           if (colcnt == 1 && rowcnt == 1)
           {
               for (int i = 0; i < drRow.Table.Columns.Count; i++)
               {
                   objWrkSheet.Cells[1, i + 1] = drRow.Table.Columns[i].ColumnName;
               }
               colcnt = drRow.Table.Columns.Count;
           }
            #endregion
            //write rows to the excel sheet
            #region insert rows to excel
            for (int i = 1; i <= colcnt; i++)
            {
                objWrkSheet.Cells[rowcnt + 1, i] = drRow[i - 1];
            }
            #endregion
            //save the workbook
            #region save workbook
            objWrkbook.SaveAs(outputFilePath, Microsoft.Office.Interop.Excel.XlFileFormat.xlWorkbookNormal, Type.Missing,
Type.Missing, Type.Missing, Type.Missing, Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlExclusive,Type.Missing,             Type.Missing, Type.Missing, Type.Missing, Type.Missing);
            #endregion

            #endregion
      }
      catch (Exception ex)
      {
           throw;
      }
      finally
      {
           //clear objects
           #region clear workbook objects
           if (objWrkSheet != null)
                  System.Runtime.InteropServices.Marshal.ReleaseComObject(objWrkSheet);
           if (objWrkbook != null)
               objWrkbook.Close(true, outputFilePath, true);
           if (objApp != null)
               objApp.Quit();
           #endregion
       }
  }

static void Main(string[] args)
{

string line;
  using (StreamReader reader = new StreamReader(@"yourFilePath.txt"))
   {
       while ((line = reader.ReadLine()) != null)
     {
      using (StreamWriter writer = new StreamWriter(@"yourFilePath.csv", true))
                  {
                      writer.WriteLine(line.Replace(",",";"));
                  }
      }
   }

}