protected void ButtonUpload1_Click(object sender, EventArgs e)
    {
        if (FileUpload1_1.HasFile)
        {
            string path = FileUpload1_1.FileName;
            int length = path.Length;
            path = path.Substring(length - 4, 4);
            string foto1 = Guid.NewGuid().ToString() + path;
            FileUpload1_1.SaveAs(Server.MapPath("~/ApartmentImages\" + foto1));
            FileUpload1_1.Visible = false;
            LabelSuccess1_1.Text = "Başarılı ...";
            HiddenFieldPhoto1_1.Value = "~/ApartmentImages/" + foto1;
        }
        if (FileUpload1_2.HasFile)
        {
            string path = FileUpload1_2.FileName;
            int length = path.Length;
            path = path.Substring(length - 4, 4);
            string foto2 = Guid.NewGuid().ToString() + path;
            FileUpload1_2.SaveAs(Server.MapPath("~/ApartmentImages\" + foto2));
            FileUpload1_2.Visible = false;
            LabelSuccess1_2.Text = "Başarılı ...";
            HiddenFieldPhoto1_2.Value = "~/ApartmentImages/" + foto2;
        }
        if (FileUpload1_3.HasFile)
        {
            string path = FileUpload1_3.FileName;
            int length = path.Length;
            path = path.Substring(length - 4, 4);
            string foto3 = Guid.NewGuid().ToString() + path;
            FileUpload1_3.SaveAs(Server.MapPath("~/ApartmentImages\" + foto3));
            FileUpload1_3.Visible = false;
            LabelSuccess1_3.Text = "Başarılı ...";
            HiddenFieldPhoto1_3.Value = "~/ApartmentImages/" + foto3;
        }
        if (FileUpload1_4.HasFile)
        {
            string path = FileUpload1_4.FileName;
            int length = path.Length;
            path = path.Substring(length - 4, 4);
            string foto4 = Guid.NewGuid().ToString() + path;
            FileUpload1_4.SaveAs(Server.MapPath("~/ApartmentImages\" + foto4));
            FileUpload1_4.Visible = false;
            LabelSuccess1_4.Text = "Başarılı ...";
            HiddenFieldPhoto1_4.Value = "~/ApartmentImages/" + foto4;
        }
        ButtonUpload1.Visible = false;
    }