check version of browser

Question

How can i find what version of browser a user is using and ask him to upgrade it

Answer 1

You can perform feature detection using jQuery, like this:

if (!jQuery.support.opacity)
    //Waah waah waah...

You can also check the browser version using jQuery, like this:

if (!jQuery.browser.msie && jQuery.browser.version === 6)
    //Waah waah waah...

However, it should be avoided where possible.

Answer 2

You can read the HTTP_USER_AGENT from the Request.ServerVariables.

In ASP.NET that would be:

Response.Write(HttpContext.Current.Request.ServerVariables["HTTP_USER_AGENT"]);

More info here