C# Method to determine whether an image is a transparent GIF image

This article example describes the method of C# to determine whether an image is a transparent GIF diagram. Share it for your reference. The details are as follows:
1. The usage method is as follows:

 objImage = DownloadImage("/images/srpr/");
if (IsTransparentPalette()) {//your code....}

2. The C# code is as follows:

public bool IsTransparentPalette( palette)
{
  if (!= 1 )
    return false;
  int total_colors = (0);
  for (int i = 0; i < total_colors - 1; i++)
  {
    if ([i].A != 0)
    {
      return false;
    }
  }
  return true;
}
public  DownloadImage(string url)
{
   tmpImage = null;
  try
  {
    HttpWebRequest request = (HttpWebRequest)(url);
     = true;
     = UserAgent;
     = "GET HTTP/1.1";
     = 2000;
     webResponse = ();
     webStream = ();
    if (webStream != null) tmpImage = (webStream);
    ();
    ();
  }
  catch (Exception exception)
  {
    return null;
  }
  return tmpImage;
}

I hope this article will be helpful to everyone's C# programming.