Excel导入到DataTable

<asp:FileUpload ID="fupFiles" runat="server" />
<asp:Button ID="btnImprot" runat="server" Text="导入" OnClick="btnImprot_Click" />

protected void btnImprot_Click(object sender, EventArgs e)
{
String fileName = System.IO.Path.GetFileName(fupFiles.FileName);
String path = Server.MapPath("~/" + fileName);
fupFiles.SaveAs(path);

DataTable dt = ImportExcelByDB(path);

}
public static DataTable ImportExcelByDB(string physicalPath)
{
string strConn = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + physicalPath + ";Extended Properties='Excel 8.0;HDR=yes'";
//  Excel 2007
if (physicalPath.ToLower().IndexOf(".xlsx") > 0 && physicalPath.ToLower().EndsWith("xlsx"))
{
//strConn = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source='" + physicalPath + "';Extended Properties='Excel 12.0;HDR=YES'";
//strConn = "'Microsoft.ACE.OLEDB.12.0','Data Source=" + physicalPath + ";Extended Properties=\"Excel 12.0;HDR=Yes;IMEX=1\"'";
strConn = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + physicalPath + ";Extended Properties='Excel 8.0;HDR=yes'";
}
//  Excel 2003
if (physicalPath.ToLower().IndexOf(".xls") > 0 && physicalPath.ToLower().EndsWith("xls"))
{
//strConn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source='" + physicalPath + "';Extended Properties='Excel 8.0;HDR=YES;'";
strConn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source='" + physicalPath + "';Extended Properties=Excel 8.0";
}
DataSet dst = new DataSet();
OleDbConnection conn = new OleDbConnection(strConn);
try
{
if (conn.State.ToString() == "Closed")
{
conn.Open();
}
dst.Clear();
string strSql = "SELECT * FROM  [Sheet1$]";
OleDbDataAdapter adapter = new OleDbDataAdapter(strSql, conn);
adapter.Fill(dst, "[Sheet1$]");
conn.Close();
}
catch (Exception ee)
{
return null;
}
return dst.Tables[0];
}