How to create cell border lines in Excel using VB code

Dim xlApp As Microsoft.Office.Interop.Excel._Application = Nothing
Dim xlWorkBooks As Microsoft.Office.Interop.Excel.Workbooks = Nothing
Dim xlWorkBook As Microsoft.Office.Interop.Excel.Workbook = Nothing
Dim xlWorkSheet1 As Microsoft.Office.Interop.Excel.Worksheet = Nothing
Dim xlWorkSheets As Microsoft.Office.Interop.Excel.Sheets = Nothing

xlApp=New Microsoft.Office.Interop.Excel.ApplicationClass
xlApp.Visible = False

xlWorkSheet1= CType(xlWorkSheets(1),Microsoft.Office.Interop.Excel.Worksheet)

xlWorkSheet1.Range(“A1:K21”).Borders.LineStyle = XlLineStyle.xlContinuous

xlApp.ActiveWindow.Zoom = 100
xlWorkBook.Close() 'Book を閉じる
xlWorkBook = Nothing
xlApp.Quit() 'Quit メソッドを使って Excel を終了します。
xlApp = Nothing

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