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Forgetting AutoPostBack=”true”

July 6, 2012

A very busy week now ends, after tweaking around the publishing of ASP.NET web sites, I had overseen some of the basic things in ASP.NET in the code.

If you find that when you use the wizard to set the index changed on the drop down list in ASP.NET and find that when you change the index on the website, and the code within the indexchanged method is not working, you realise that AutoPostback has not been set like so: –

<asp:DropDownList ID=”ddlDropDownListt” runat=”server”
                    onselectedindexchanged=”ddlDropDownList_SelectedIndexChanged” AutoPostBack=”True”></asp:DropDownList>

Always remember to add AutoPostBack=”True” for the web server to cause a postback and run the specified method which from above is ddlDropDownList_SelectedIndexChanged.

What I realise is that if you run other methods that causes a postback, this method also reflects the changes made, so they run in sequence during post backs behind the scenes.


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