c# - (System.Web.UI.WebControls.Button) is not compatible with the type of control (System.Web.UI.HtmlControls.HtmlButton) -


when run application works on visual studio works when upload on server error of 

the base class includes field 'hiddenbutton', type(system.web.ui.webcontrols.button) not compatible type of control (system.web.ui.htmlcontrols.htmlbutton).

for button used:

<button id="hiddenbutton" runat="server" onserverclick="btnclick_click" style="display:none;" ></button>

c# code is:

   protected void btnclick_click(object sender, eventargs e)     {          downloadaspdf();     }      public void downloadaspdf()     {

i don't have sure, try change this.

<asp:button id="hiddenbutton" runat="server" onclick="btnclick_click" text="" style="display:none;" />

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