DropDownList的SelectedIndexChanged事件未触发

Question

ASPX FILE contain DropDown as Follows:

< asp:DropDownList ID="drpDist" runat="server" CssClass="dropDownStyle" OnSelectedIndexChanged="drpDist_SelectedIndexChanged" TabIndex="6">

In ASPX.CS FILE

protected void drpDist_SelectedIndexChanged(object sender, EventArgs e)
{
}

Please Help me.I can't get why it is not working.

Answer 1

使用财产

AutoPostBack="True"

Answer 2

you need to set AutoPostBack="true"

<asp:DropDownList ID="drpDist" runat="server" AutoPostBack="true">

when you set that property as true, a postback to the server automatically occurs whenever the user changes the selection of the list

Answer 3

You need to set the AutoPostBack="True" property. This will make the page to postback automatically hence firing your event.

Answer 4

设置AutoPostBack="true"

< asp:DropDownList ID="drpDist" runat="server" AutoPostBack="true" CssClass="dropDownStyle" OnSelectedIndexChanged="drpDist_SelectedIndexChanged" TabIndex="6">