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private bool IsPicture(string filePath)//filePathÊÇÎļþµÄÍêÕû·¾¶
{
try
{
FileStream fs = new FileStream(filePath, FileMode.Open, FileAccess.Read);
BinaryReader reader = new BinaryReader(fs);
string fileClass;
byte buffer;
byte[] b=new byte[2];
buffer = reader.ReadByte();
b[0] = buffer;
fileClass = buffer.ToString();
buffer = reader.ReadByte();
b[1]=buffer;
fileClass += buffer.ToString();
reader.Close();
fs.Close();
if (fileClass == "255216 ")//255216ÊÇjpg;7173ÊÇgif;6677ÊÇ
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PageLoad
private void Page_Load(object sender, System.EventArgs e)
{
string checkCode = CreateRandomCode(4);
Session["CheckCode"] = checkCode;
CreateImage(checkCode);
......