How to give border when exporting data to excel from datagridview to clipboard

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C#3.5

I copied datagridview data to clipboard and paste it in excel.
But I want border to all cells in datagridview when exported in excel.

What I have tried:

private void CopyGridToClipboard(DataGridView grid)
{
//Exclude row headers
grid.RowHeadersVisible = false;
grid.BorderStyle = BorderStyle.FixedSingle;

//Include column headers
grid.ClipboardCopyMode = DataGridViewClipboardCopyMode.EnableAlwaysIncludeHeaderText;
grid.SelectAll();
DataObject dataObj = grid.GetClipboardContent();
if (dataObj != null)
Clipboard.SetDataObject(dataObj);

//Set the visibility of row headers back
grid.RowHeadersVisible = true;

}


private void btnExport_Click(object sender, EventArgs e)
{


//Open the excel application and add a workbook
XL.Application application;
XL.Workbook book;
XL.Worksheet sheet;
application = new XL.Application();
application.Visible = true;
book = application.Workbooks.Add();
sheet = (XL.Worksheet)book.Worksheets[1];

this.CopyGridToClipboard(dataGridView1);
XL.Range gridRange = (XL.Range)sheet.Cells[9, 2];
gridRange.Select();
sheet.PasteSpecial(gridRange);
}