Gridview Header Text Only Changes After Second Button Click

Nov 26, 2015

The Headertext of my column only changes after clicking the button a second time round, why is this? I obviously need it to work on the first click.

HTML Code:
<%@ Page Language="vb" AutoEventWireup="false" CodeBehind="ChangeHeader.aspx.vb" Inherits="ColHeaderChangeTest.ChangeHeader" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">

[code]....

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