Cascading One DropdownList with Another in Insert command on asp - asp.net

Question

I have this asp in a formview insert template.
<asp:FormView ID="FormViewReport" runat="server">
<InsertItemTemplate>
GAME_ID:
<asp:DropDownList ID="DropDownListReportIns" runat="server" AutoPostBack="true"
DataSourceID="SqlDataSourceGetGame"
DataTextField="GAME" DataValueField="ID" SelectedValue='<%# Bind("GAME_ID") %>' AppendDataBoundItems="True">
<asp:ListItem Text="ΠΑΡΑΚΑΛΩ ΕΠΙΛΕΞΤΕ ΑΓΩΝΑ" />
</asp:DropDownList>
HOME_PLAYER:
<asp:DropDownList ID="DropDownListRepo" runat="server"
DataSourceID="SqlDataSourceGetPlayers"
DataTextField="HOME_PLAYER_S" DataValueField="HP_ID" SelectedValue='<%# Bind("HOME_PLAYER_ID") %>' >
</asp:DropDownList>
The sql datasource of the second dropdownlist:
<asp:SqlDataSource ID="SqlDataSourceGetPlayers" runat="server" ConnectionString='<%$ ConnectionStrings:BasketballConnectionString1 %>' SelectCommand="SELECT HP.SURNAME blah blah blah WHERE (GAMES.ID = #GAME_ID)">
<SelectParameters>
<asp:ControlParameter ControlID="FormViewReport" PropertyName="SelectedValue" Name="GAME_ID"></asp:ControlParameter>
</SelectParameters>
In the second Dropdownlist the query needs the GAME_ID parameter and this is the DatavalueField of the first dropdownlist.How I can get the selected value from the first dropdownlist and give it to the second dropdownlist?

Answer 1

Put your SqlDatasource control inside the InsertItemTemplate of your FormView (with the DropDownLists), and then change it to this:
<asp:SqlDataSource ID="SqlDataSourceGetPlayers" runat="server" ConnectionString='<%$ ConnectionStrings:BasketballConnectionString1 %>' SelectCommand="SELECT HP.SURNAME blah blah blah WHERE (GAMES.ID = #GAME_ID)">
<SelectParameters>
<asp:ControlParameter ControlID="DropDownListReportIns" PropertyName="SelectedValue" Name="GAME_ID"></asp:ControlParameter>
</SelectParameters>
</asp:SqlDataSource
That way your ControlParameter is referencing the selected value of the 1st drop down.

Answer 2

Finally I did it using asp for the second dropdownlist:
<asp:DropDownList ID="DropDownListRepIns" runat="server" AppendDataBoundItems="True" EnableViewState="false"
DataSourceID="SqlDataSourceGetPlayers"
DataTextField="HOME_PLAYER_S" DataValueField="HP_ID" >
<asp:ListItem Text="ΠΑΡΑΚΑΛΩ ΕΠΙΛΕΞΤΕ ΑΓΩΝΑ" Value="0" />
</asp:DropDownList><br />
and a c# code for event item inserting that binds manually:
protected void FormViewReport_ItemInserting(object sender, FormViewInsertEventArgs e)
{
e.Values["HOME_PLAYER_ID"] = ((DropDownList)((FormView)sender).FindControl("DropDownListRepIns")).SelectedValue;}
Also the solution this solution works without needing code behind:
SelectedValue='<%# DataBinder.Eval (Container.DataItem, "HOME_PLAYER_ID") %>'
You have to use this in the second dropdownlist in asp.