I have two DropDownLists. Once a DropDownList1 value is selected, DropDownList2 will populate based on Dropdownlist1.
But after the page refreshes, the dropdownlist1 selected value is changed to the top-most value (the DropDownList is populate by a database).
.aspx:
x
<asp:DropDownList ID="DropDownList1" runat="server" Width="300px" CssClass="makeselect" OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged" AutoPostBack="True" AppendDataBoundItems="true">
</asp:DropDownList>
.cs:
protected void Page_Load(object sender, EventArgs e) {
DataTable subjects = new DataTable();
if (Page.IsPostBack == false) {
using (SqlConnection con = new SqlConnection(constring)) {
SqlDataAdapter adapter = new SqlDataAdapter("SELECT VehicleMake FROM VehicleDB", con);
adapter.Fill(subjects);
con.Open();
DropDownList1.DataSource = subjects;
DropDownList1.DataTextField = "VehicleMake";
DropDownList1.DataValueField = "";
DropDownList1.DataBind();
con.Close();
}
}
}
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e) {
string makename = DropDownList1.SelectedItem.Value;
keepname = makename;
Response.Redirect("default.aspx?QSVehicleMake="+makename);
}
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Answer
You can use SESSION value for this purpose, using this value you need to find Item from dropdown
protected void Page_Load(object sender, EventArgs e)
{
jpyRATE = 1.4;
DataTable subjects = new DataTable();
if (Page.IsPostBack == false)
{
using (SqlConnection con = new SqlConnection(constring))
{
SqlDataAdapter adapter = new SqlDataAdapter("SELECT VehicleMake FROM VehicleDB", con);
adapter.Fill(subjects);
con.Open();
DropDownList1.DataSource = subjects;
DropDownList1.DataTextField = "VehicleMake";
DropDownList1.DataValueField = "VehicleMake";
DropDownList1.DataBind();
if(!String.IsNullOrEmpty(Session["vehiclemake"] as string))
{
DropDownList1.SelectedIndex =
DropDownList1.Items.IndexOf(DropDownList1.Items.FindByValue(Session["vehiclemake"].ToString()));
}
con.Close();
}
}
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
string makename = DropDownList1.SelectedItem.Value;
keepname = makename;
Session["vehiclemake"] = keepname;
Response.Redirect("default.aspx?QSVehicleMake="+makename);
}