How to make HtmlSelect Control with OnChange event to trigger C# code behind function

Question

How should I make \"Html Select Control\" with OnChange event to trigger C# code behind function
like ASP.NET SelectedIndexChanged of the DropDownList C

Answer 1

I've found a great way to handle my problems, showing my ideas as following code

Front End

Back End

protected void Page_Load(object sender, EventArgs e)
{     
   ClientScriptManager cs = Page.ClientScript;
   this.StartDate.Attributes.Add("onchange", cs.GetPostBackEventReference(this.StartDate, this.StartDate.ID));
}
protected void StartDate_ServerChange(object sender, EventArgs e)
{

}

PS: two references
https://msdn.microsoft.com/en-us/library/ms153112(v=vs.110).aspx
https://blog.csdn.net/lovegonghui/article/details/51942241