How we fill template field dropdown based on another dropdown value in ASP.NET .aspx page

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<itemtemplate>
<asp:dropdownlist id="cmdDept" runat="server" text="<%# Bind("DeptAbbr") %>"
="" datasourceid="DeptSqlDataSource" datatextfield="DeptAbbr" datavaluefield="DeptAbbr" width="64px">

<asp:sqldatasource id="DeptSqlDataSource" runat="server" connectionstring="<%$ ConnectionStrings:PMSConnectionString %>"

="" selectcommand="SELECT [DeptAbbr] FROM [DeptMaster] where DeptAbbr =<%cmbDeptAbbr.SelectedItem.Text%> ORDER BY [DeptCode]">

What I have tried:

 SelectCommand="SELECT [DeptAbbr] FROM [DeptMaster] where DeptAbbr =<%cmbDeptAbbr.SelectedItem.Text%> ORDER BY [DeptCode]">
                                         

in the cmbDeptAbbr.SelectedItem.Text its show error , am I defined correctly ?

Posted 30-May-19 0:31am

Member 10194266

Updated 31-May-19 3:07am

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User 4180254 · Answer 1 · 2019-05-30T03:06:00

Solution 1

You have not provided sufficient information to your problem but looks like you are trying to create cascading dropdown function. Refer the below links for more details on it -

Cascading A DropDownList With Another DropDownList in ASP.Net[^]

Posted 30-May-19 3:06am

User 4180254

Comments

Member 10194266 31-May-19 0:20am

Hi Vinod
My code is below:

<asp:templatefield headertext="Dept">
<itemtemplate>
<asp:dropdownlist id="cmdDept" runat="server" text="<%# Bind("DeptAbbr") %>"
="" datasourceid="DeptSqlDataSource" datatextfield="DeptAbbr" datavaluefield="DeptAbbr" width="64px">

<asp:sqldatasource id="DeptSqlDataSource" runat="server" connectionstring="<%$ ConnectionStrings:PMSConnectionString %>"
="" selectcommand="SELECT [DeptAbbr] FROM [DeptMaster] ORDER BY [DeptCode]">

<headerstyle font-size="9pt" horizontalalign="Left" verticalalign="Top">
<itemstyle horizontalalign="Left" verticalalign="Top">

-----------------------

SelectCommand="SELECT [DeptAbbr] FROM [DeptMaster] ORDER BY [DeptCode]">
in this query i want to used cmbDeptAbbr.SelectedItem.Text how can i used in the here

Richard Deeming · Answer 2 · 2019-05-31T03:08:00

Add a ControlParameter to your data source control:
ControlParameter Class (System.Web.UI.WebControls) | Microsoft Docs[^]

ASP.NET

<asp:SqlDataSource id="DeptSqlDataSource" runat="server"
    connectionstring="<%$ ConnectionStrings:PMSConnectionString %>"
    selectCommand="SELECT [DeptAbbr] FROM [DeptMaster] WHERE DeptAbbr = @DeptAbbr ORDER BY [DeptCode]"
>
<SelectParameters>
    <asp:ControlParameter
        Name="DeptAbbr"
        ControlId="cmbDeptAbbr"
        PropertyName="SelectedValue"
    />
</SelectParameters>
</asp:SqlDataSource>