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I want to add optgroup to the "HtmlSelect" dynamicly with c#. I am using following code for adding items but i can't find documentation for adding optgroup with c#. Thanks in advance.

   Select1.Items.Add(new ListItem("SomeData", "1"));
Murat Tutu
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  • Possible duplicate of [How can I add option groups in ASP.NET drop down list?](http://stackoverflow.com/questions/16167862/how-can-i-add-option-groups-in-asp-net-drop-down-list) – Pete Oct 12 '15 at 10:40

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