SelectedIndexChanged does not fire when change index of dropdownlist

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My code is

ASP.NET

    <asp:DropDownList runat="server" ID="ddlFPS" AutoPostBack="true"  CssClass="form-control input-sm" 
                            OnSelectedIndexChanged="ddlFPS_SelectedIndexChanged"
                         ></asp:DropDownList>
<br />
<asp:LinkButton OnClick="lnkSearchNow_Click" ID="lnkSearchNow" runat="server"  
                        >
                             
                            </asp:LinkButton>

in c#

C#

    protected void lnkSearchNow_Click(object sender, EventArgs e)
    {
        ddlFPS.SelectedIndex = 10;
}

but when i change manually event fires.

Posted 8-Nov-15 20:37pm

Member 7909353

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PANKAJMAURYA · Accepted Answer · 2015-11-08T21:07:00

Solution 1

You can call the selectedIndexChanged event explicitly on button click like

C#

protected void lnkSearchNow_Click(object sender, EventArgs e)
    {
        ddlFPS.SelectedIndex = 10;
        ddlFPS_SelectedIndexChanged(null,null);        
}

Posted 8-Nov-15 21:07pm

PANKAJMAURYA

Comments

Member 7909353 9-Nov-15 3:57am

But why it is not call implicitly

[no name] 16-Nov-15 2:39am

ASP.NET does not have binding support everything you do on UI will not reflect immediately to code or vice versa. SelectedIndexChanged event only fire when you change its index by selecting it from UI.