Import Excel data to datagrid Why error ?

private void button1_Click(object sender, EventArgs e)
       {
           String str = "Provider=Microsoft.Jet.OLEDB.4.0;" +
          "Data Source=D:\\Book1.xls;" +
          "Extended Properties=Excel 8.0;";

           DataSet d = new DataSet();
           //You must use the $ after the object
           //you reference in the spreadsheet
           OleDbDataAdapter da = new OleDbDataAdapter
           ("SELECT * FROM [Sheet1$]", str);

           //da.TableMappings.Add("Table", "ExcelTest");

           da.Fill(d);
           dataGrid1.DataSource = d.Tables[0].DefaultView;
           dataGrid1.DataBind();
       }