How to preselect drop-down list in page 2 with assigned value from page 1 via response.redirect

So please mark the reply from Krishna as Accepted Answer, the credit must go to him only.
 

Hi Krishna,
many thx, your suggestion works fine but gave me a new problem to solve.
Loading values and having wanted values preselectec works fine but the problem is that in one of the drop-downs (last one) all values (including preselected value) is showed for a second/while and then all values are removed from the drop-down, how come and how to solve this? The drop-down has a 'SelectedIndexChanged' and 'AutoPostBack' is set to true. 'SelectedIndexChanged'/'AutoPostBack' is loading an ajax panel with some information generated from the information in drop-downs which also is showed for a second/while and then dissapears.

In page1.aspx.cs write
Response.Redirect("Page2.aspx?val="+DropdownList1.SelectedValue.ToString());
In Page2.aspx.cs write following code
Page_Load()
{
if(!IsPostBack)
{
DropDownList1.SelectedValue=Request.QueryString["val"].ToString();
}
}