how to send dropdownlist selectedvalue as postback argument in ASP.NET

I have a server control that works with \[code\]IPostBackEventHandler\[/code\].And inside that control, I have a DropDownList.And this DropDownList should raise postback event with it's argument.\[code\]DropDownList _ddl = new DropDownList();_ddl.Attributes.Add(HtmlTextWriterAttribute.Onchange.ToString() , this.Page.ClientScript.GetPostBackEventReference(this, "this.value"));\[/code\]What I am trying to do is to get the selected value of DropDownList on postback.\[code\]public void RaisePostBackEvent(string eventArgument){}\[/code\]When I receive from the RaisePostBackEvents, I only get "this.value". Not the selected value from DropDownList.How could I solve this problem?
 
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