Cascading dropdowns bound to MSSQL

mashype · #1 (**permalink**) May 25th, 2009, 12:42 PM

I have seen several threads on this issue and can not seem to get any of it to work for me. I have two drop downs on a form that cascade down for data entry. Basically they are a 'Long Term Goal', and then a 'Short Term Goal' based on the first drop down. I keep getting this error every time I try to bind the data to the SQL file.

When I try to databind the second dropdown, I get this error 'Databinding methods such as Eval(), XPath(), and Bind() can only be used in the ......'

I have tried turning the 'EnableView State' on and off with no luck.

Here are my dropdown codes:

Code:

<InsertItemTemplate>
<asp:DropDownListID="DropDownList2"runat="server"AutoPostBack="True"DataSourceID="LT"DataTextField="LTGoal"DataValueField="LTGoalID"EnableViewState="False">
</asp:DropDownList>
<asp:SqlDataSourceID="LT"runat="server"ConnectionString="<%$ ConnectionStrings:anthemprodConnectionString %>"SelectCommand="SELECT [LTGoalID], [LTGoal] FROM [TblGoalsLT]">
</asp:SqlDataSource>
STGoal:
<asp:SqlDataSourceID="ST"runat="server"ConnectionString="<%$ ConnectionStrings:anthemprodConnectionString %>"SelectCommand="SELECT SpecTargetID, SpecificTarget, MeasureID FROM TblGoalsST WHERE (MeasureID = @SpecTargetID)">
<SelectParameters>
<asp:ControlParameterControlID="DropDownList2"Name="SpecTargetID"PropertyName="SelectedValue"Type="Int32"/>
</SelectParameters>
</asp:SqlDataSource>
<asp:DropDownListID="DropDownList1"runat="server"DataSourceID="ST"DataTextField="SpecificTarget"DataValueField="SpecTargetID">
</asp:DropDownList>
<br/>
<asp:LinkButtonID="InsertButton"runat="server"CausesValidation="True"CommandName="Insert"Text="Insert"/>
&nbsp;<asp:LinkButtonID="InsertCancelButton"runat="server"CausesValidation="False"CommandName="Cancel"Text="Cancel"/>
</InsertItemTemplate>

Is there some C# code bihind I am not understanding, or is there something in the dropdown setup that I am missing?

Any help would be GREATLY appreicated!

Lee Dumond · #2 (**permalink**) May 25th, 2009, 05:24 PM

Have you considered using the CascadindDropDown AJAX control? This would be easier, in addition to avoiding the postback to populate the second list.

http://www.asp.net/AJAX/AjaxControlT...gDropDown.aspx

mashype · #3 (**permalink**) July 24th, 2010, 01:41 AM

I actualle gave up on this for a while, but still want to get this done. I am trying to incorporate the AJAX control but having problems..

Here is the code I have:

Code:

<%@PageLanguage="C#"AutoEventWireup="true"CodeFile="Index.aspx.cs"Inherits="Anthem_Admin_Index" %>
<%@Registerassembly="AjaxControlToolkit"namespace="AjaxControlToolkit"tagprefix="asp" %>
<!DOCTYPEhtmlPUBLIC"-//W3C//DTD XHTML 1.0 Transitional//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<htmlxmlns="http://www.w3.org/1999/xhtml">
<headrunat="server">
<title></title>
</head>
<body>
<formid="form1"runat="server">
<div>
<asp:ScriptManagerID="ScriptManager1"runat="server"/>
<asp:FormViewID="FormView1"runat="server"DataKeyNames="ProductionID"DataSourceID="Tasks"EnableModelValidation="True"DefaultMode="Insert">
<InsertItemTemplate>
LTGoal:
<asp:DropDownListID="DropDownList1"runat="server"AutoPostBack="True"DataSourceID="LT"DataTextField="LTGoal"DataValueField="LTGoalID">
</asp:DropDownList>
<br/>
STGoal:
<asp:DropDownListID="DropDownList2"runat="server"DataSourceID="ST"DataTextField="SpecificTarget"DataValueField="SpecTargetID"SelectedValue='<%# Bind("STGoal") %>'>
</asp:DropDownList>
<asp:CascadingDropDownID="DropDownList2_CascadingDropDown"runat="server"Enabled="True"ServiceMethod="GetDropDownContents"TargetControlID="DropDownList2"UseContextKey="True"Category="Tasks"EmptyText="Select LT Goal">
</asp:CascadingDropDown>
<br/>
Comments:
<asp:TextBoxID="CommentsTextBox"runat="server"Text='<%# Bind("Comments") %>'/>
<br/>
<asp:LinkButtonID="InsertButton"runat="server"CausesValidation="True"CommandName="Insert"Text="Insert"/>
&nbsp;<asp:LinkButtonID="InsertCancelButton"runat="server"CausesValidation="False"
CommandName="Cancel"Text="Cancel"/>
<asp:SqlDataSourceID="LT"runat="server"ConnectionString="<%$ ConnectionStrings:anthemprodConnectionString %>"SelectCommand="SELECT [LTGoalID], [LTGoal] FROM [TblGoalsLT]">
</asp:SqlDataSource>
<asp:SqlDataSourceID="ST"runat="server"ConnectionString="<%$ ConnectionStrings:anthemprodConnectionString %>"SelectCommand="SELECT [SpecTargetID], [SpecificTarget] FROM [TblGoalsST] WHERE ([MeasureID] = @MeasureID)">
<SelectParameters>
<asp:ControlParameterControlID="DropDownList1"Name="MeasureID"PropertyName="SelectedValue"Type="Int32"/>
</SelectParameters>
</asp:SqlDataSource>
</InsertItemTemplate>
</asp:FormView>
<asp:SqlDataSourceID="Tasks"runat="server"ConnectionString="<%$ ConnectionStrings:anthemprodConnectionString %>"DeleteCommand="DELETE FROM [TblProduction] WHERE [ProductionID] = @ProductionID"InsertCommand="INSERT INTO [TblProduction] ([LTGoal], [STGoal], [Comments]) VALUES (@LTGoal, @STGoal, @Comments)"SelectCommand="SELECT [ProductionID], [LTGoal], [STGoal], [Comments] FROM [TblProduction]"UpdateCommand="UPDATE [TblProduction] SET [LTGoal] = @LTGoal, [STGoal] = @STGoal, [Comments] = @Comments WHERE [ProductionID] = @ProductionID">
<DeleteParameters>
<asp:ParameterName="ProductionID"Type="Int32"/>
</DeleteParameters>
<InsertParameters>
<asp:ParameterName="LTGoal"Type="Int32"/>
<asp:ParameterName="STGoal"Type="Int32"/>
<asp:ParameterName="Comments"Type="String"/>
</InsertParameters>
<UpdateParameters>
<asp:ParameterName="LTGoal"Type="Int32"/>
<asp:ParameterName="STGoal"Type="Int32"/>
<asp:ParameterName="Comments"Type="String"/>
<asp:ParameterName="ProductionID"Type="Int32"/>
</UpdateParameters>
</asp:SqlDataSource>
</div>
</form>
</body>
</html>

I have been able to get the dropdowns to display correctly, but when I try to bind the second dropdown, I still get that databinding error. Am I not setting something up right with the AJAX control?

nzza456 · #4 (**permalink**) August 6th, 2010, 06:18 AM

thanks for sharing nice information

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