Check which version of DirectX is installed

Question

As per the title, how can I check which version of DirectX a user has installed? Checking the FeatureLevel isn\'t enough, as my application can run on feature level 10.0, bu

Answer 1

EDIT: Removed registry check method because it works only for Dx <=9 (thx @Telanor)

This method is very, very slow, but only one I figured out that is 100% accurate

private static int checkdxversion_dxdiag()
{
    Process.Start("dxdiag", "/x dxv.xml");
    while (!File.Exists("dxv.xml"))
        Thread.Sleep(1000);
    XmlDocument doc = new XmlDocument();
    doc.Load("dxv.xml");
    XmlNode dxd = doc.SelectSingleNode("//DxDiag");
    XmlNode dxv = dxd.SelectSingleNode("//DirectXVersion");

    return Convert.ToInt32(dxv.InnerText.Split(' ')[1]);
}