c# - Calling a function in Aspx.cs with change in dropdownbox -

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I have a page where the change in value from drop down box will pass this text in the drop-down box. To get value from the database. 

  & amp; Asp: dropdown list id = "dropid" runat = "server" OnChange = "getvaluesfromaspx"> & Lt; / Asp: DropDownList & gt;   
 I want the function called "Getvaluesfromaspx" to call from aspx file in aspx.cs. help please.  
  
 
 
 Use the "on-selected index change" event instead of the "Onchange" event.  
 Also set AutoPostBack property value to true.  
  & lt; ASP: Dropdown List ID = "DropDayed" Autopostback = "True" Run = "Server" On-Select Index-Changed = "Getleus Framespax" & gt; & Lt; / Asp: DropDownList & gt;   
 and in the rear code  
  protected zero gatewaylosphromaspex (object sender, eventArgse E) {//}

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