excel导入出现异常，不支持关键字: “provider”

excel导入出现错误，不支持关键字: “provider”。

C# code

string sqlstr;sqlstr = "Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=" + strpath + ";" + "Extended Properties=Excel 8.0;";SqlConnection conn = new SqlConnection(sqlstr);SqlDataAdapter adapter = new SqlDataAdapter("SELECT * FROM [Sheet1$]",conn);adapter.Fill(ds,"excel");