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Editorial Team
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Asked: 2026-05-26T21:55:45+00:00

hy, i configured dropdownlist : <asp:DropDownList ID=ddl_filter1 runat=server Width=120px DataSourceID=ObjectDataSource1 DataTextField=PLC DataValueField=PLC OnSelectedIndexChanged=ddl_filter1_SelectedIndexChanged />

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hy,
i configured dropdownlist:

<asp:DropDownList ID="ddl_filter1" runat="server" Width="120px" DataSourceID="ObjectDataSource1"
                                        DataTextField="PLC" DataValueField="PLC" OnSelectedIndexChanged="ddl_filter1_SelectedIndexChanged" />

and i want that when i choose a value from the DropDownList an event will happen

but for somereason the code behind do not run.

what is the problem in my code ?

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1 Answer

  1. Editorial Team

    Did you put AutoPostBack="true" for the ddl?

    For your code would be:

    <asp:DropDownList ID="ddl_filter1" runat="server" Width="120px" DataSourceID="ObjectDataSource1"
      DataTextField="PLC" DataValueField="PLC" AutoPostBack="true" OnSelectedIndexChanged="ddl_filter1_SelectedIndexChanged" />
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