In my .cshtml page, we are calling an .aspx page through virtual path (eg. /includes/header.aspx) and trying to convert its output into a string and embed on the page.

But it’s throwing this error:

HttpException: The file ‘/includes/header.aspx’ does not exist

I tried executing the output of the .aspx page, converting its output into string and embedding into cshtml page using HttpContext.Current.Server.Execute as shown below.

using(new Tracer(virtualPath, httpContext.Request, httpContext.Request.Url))
{
    using(StringWriter stringWriter = new StringWriter())
    {
        HttpContext.Current.Server.Execute(virtualPath, stringWriter);
        var stringBuilder = stringWriter.GetStringBuilder();
        razorOutput = stringWriter.ToString();
    }
}