How to call prerender function for particular control in asp.net

See more:

C#

ASP.NET

Hi,
I creating webusercontrol. In my .ascx page
How to call the prerender function for particular control in asp.net

for ex:

private void Button1_PreRender(object sender, EventArgs e)
{
    //Button has OnClientClick property so we can assign to it directly
    Button btn1 = (Button)sender;
    btn1.OnClientClick = this.OnClientClick;
    
}

In aspx page i give following

<asp:Button ID="Button1" runat="server" Text="Button" UseSubmitBehavior="false" OnPreRender="Button1_PreRender" />

But it show the error Button1_PreRender is not defined.