(C#) Determining whether the current build mode is Debug or Release

public static bool IsInDebugMode(string FileName)
{
    var assembly = System.Reflection.Assembly.LoadFile(FileName);
    var attributes = assembly.GetCustomAttributes(typeof(System.Diagnostics.DebuggableAttribute), false);
    if (attributes.Length > 0)
    {
        var debuggable = attributes[0] as System.Diagnostics.DebuggableAttribute;
        if (debuggable != null)
            return (debuggable.DebuggingFlags & System.Diagnostics.DebuggableAttribute.DebuggingModes.Default) == System.Diagnostics.DebuggableAttribute.DebuggingModes.Default;
        else
            return false;
    }
    else
        return false;
}