How I can remove the F1, F2 ... In datagridview of excel data?

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C#

MS-Excel

My project requires me to read excel data using c#. When i display the worksheet using the gridview, i found that the display also include F1, F2, ... as the header for every column. How i can remove the F1, F2, ...? I want the header of every column is the same as in excel file. Such as, File size, Audio and ...

What I have tried:

Here is my code for connection:
public DataTable ReadExcel(string fileName, string fileExt)
{
string conn = string.Empty;
DataTable dtexcel = new DataTable();
if (fileExt.CompareTo(".xls") == 0)
conn = @"provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + fileName + ";Extended Properties='Excel 8.0;HRD=Yes;IMEX=1';"; //for below excel 2007
else
conn = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + fileName + ";Extended Properties='Excel 12.0;HDR=NO';"; //for above excel 2007
using (OleDbConnection con = new OleDbConnection(conn))
{
try
{
OleDbDataAdapter oleAdpt = new OleDbDataAdapter("select * from [Files Audio$]", con); //here we read data from sheet1
oleAdpt.Fill(dtexcel); //fill excel data into dataTable
}
catch { }
}
return dtexcel;
}