ASP.NET Interface Controls - Dropdown List - AutoPostBack property





By setting AutoPostBack to true, the page will be posted back to the server when the selection is changed.
ASP.NET 
<obout:OboutDropDownList runat="server" ID="ddl1"  AutoPostBack="true" ... />

"That worked wonders. I am very pleased with the product. It's a huge improvement on the ASP.NET built-in control."

Mitesh Patel
Agilent Technologies

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