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Editorial Team
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Asked: 2026-06-13T09:49:32+00:00

html <asp:DropDownList ID=ddlOffice runat=server Rows=10 Width=300px AutoPostBack=true OnSelectedIndexChanged=ddlOffice_SelectedIndexChanged EnableViewState=true /> Even though according to

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html

    <asp:DropDownList ID="ddlOffice" runat="server" Rows="10" Width="300px" AutoPostBack="true" OnSelectedIndexChanged="ddlOffice_SelectedIndexChanged" EnableViewState="true"   />

Even though according to MSDN I am doing everything correctly. the SelectedIndexChanged still fires twice. Any ideas how this can fixed?

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1 Answer

  1. Editorial Team

    One possible reason: If you have a also registered the event handler in codebehind(f.e. via Handles clause in VB.NET or += in C#) it will cause the event to be fired twice.

    Then you just have to remove one of it, for example on aspx:

    <asp:DropDownList ID="ddlOffice" 
    runat="server" Rows="10" Width="300px"
    AutoPostBack="true" 
    EnableViewState="true"   />
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