Send DropDownList value to another page in querystring and fetch record by querystring value on page load using jQuery Ajax in ASP.Net

gpiyush152 says:

protected void btnSubmit_Click(object sender, EventArgs e)
{
Response.Redirect("DisplayDetails.aspx?ID=" + hfID.Value);
}

 above codes html will be like below  

 <asp:Button ID="btnSubmit" Text="Submit" OnClick="btnSubmit_Click" runat="server" />

and keep in mind there should be a page with name DisplayDetails.aspx or the page where you are redirecting on button click as in sample i was redirecting it to the DisplayDetails.aspx mention the page name where you want to redirect on the button click.