完美解决Excel的连接字符串与上传方法

1:第一个连接字符串为上传03的，第2个连接字符串能兼容所有的

 //string strCon = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + filenameurl + ";extended properties='Excel 8.0;HDR=No;IMEX=1;'";
  string strCon = "Provider=Microsoft.ACE.OLEDB.12.0;" + "Data Source=" + filenameurl + ";" + "Extended Properties=Excel 8.0;";

2：导入按钮

 protected void btnExport_Click(object sender,EventArgs e)
        {
            if (FileUpload1.HasFile == false)
            {
                Response.Write("<script>alert('请您选择Excel文件')</script> ");
                return;//当无文件时,返回
            }
            string IsXls = System.IO.Path.GetExtension(FileUpload1.FileName).ToString().ToLower();
            if (IsXls != ".xls" && IsXls != ".xlsx")
            {
                Response.Write("<script>alert('只可以选择Excel文件')</script>");
                return;//当选择的不是Excel文件时,返回
            }
            string filename = FileUpload1.FileName;                       //获取Execle文件名
            if (!Directory.Exists(path))
            {
                Directory.CreateDirectory(path);
            }
            string FilePath = path + filename;
            if (File.Exists(FilePath))
                File.Delete(FilePath);

            //FileUpload1.SaveAs(path + filename);
            DataTable ds = ExecleDs(path + filename);
        }

        private DataTable ExecleDs(string filenameurl)
        {
            //string strCon = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + filenameurl + ";extended properties='Excel 8.0;HDR=No;IMEX=1;'";
            string strCon = "Provider=Microsoft.ACE.OLEDB.12.0;" + "Data Source=" + filenameurl + ";" + "Extended Properties=Excel 8.0;";
            OleDbConnection conn = new OleDbConnection(strCon);

            OleDbDataAdapter odda = new OleDbDataAdapter("select * from [Sheet1$]", conn);
            DataTable dt = new DataTable();
            odda.Fill(dt);
            return dt;
        }