Untitled

Why does Response.Redirect() work in Chrome but not in IE?
string url = "Detailscherm.aspx?"
            + "melder=" + Server.UrlEncode(gv.SelectedRow.Cells[1].Text)
            + "&onderwerp=" + Server.UrlEncode(gv.SelectedRow.Cells[2].Text)
            + "&omschrijving=" + Server.UrlEncode(lblOmschrijving.Text)
            + "&fasedatum=" + Server.UrlEncode(gv.SelectedRow.Cells[4].Text)
            + "&outlookid=" + Server.UrlEncode(lblOutlookID.Text)
            + "&status=" + Server.UrlEncode(status)

            + "&niv1=" + Server.UrlEncode("")
            + "&niv2=" + Server.UrlEncode("");


Response.Redirect(url);

Session["melder"] = Server.UrlEncode(gv.SelectedRow.Cells[1].Text);
Session["onderwerp"] = Server.UrlEncode(gv.SelectedRow.Cells[2].Text);
...

Response.Redirect("Detailscherm.aspx");

string melder = Session["melder"];
Session["melder"] = "";

string value = "../containing html";
Response.Redirect("http://www.mysite.com/?Value=" + Server.UrlEncode(value));