sorry, just noticed the code does:
HtmlMeta meta =
new
HtmlMeta();
meta.Attributes.Add(
"http-equiv"
,
"X-UA-Compatible"
);
meta.Attributes.Add(
"content"
,
"IE=EmulateIE10"
);
and then
Page.Header.Controls.Add(meta);
so it does add one entry to the header, it's just that the HtmlMeta entry it adds has two parts (in IIS admin console it's much easier, you don't see http-equiv and content, you just set X-UA-Compatible to be equal to IE=EmulateIE10