My URL is built like this: localhost:56698/Default.aspx?`lehrlingID=114`
The `lehrlingID=114` that you see at the end of my url gets saved in a variable like this 

```
lehrlingID = Convert.ToInt32(Request.QueryString["lehrlingID"]);` 

```

Now i have to check for another variable as well like this: 

```
string md5key = Request.QueryString["id"];

```

My URL should look like this then: localhost:56698/Default.aspx`?`lehrlingID=114&?id=123904871029

how can i save the `lehrlingID` and the `id` in 2 different variables even if they are in the same url? And how can i get the QuestionMark `?` between my variables in the url?