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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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using System.Security.Cryptography;
using System.IO;
using System.text;
 
        /// <summary>
        /// ¼ÓÃÜ
        // ......

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Page.ClientScript.RegisterStartupScript(Page.GetType(), "message", "<script language='javascript' defer>alert('¼ÓÈëÔÝ´æ¼Ü³É¹¦£¡');</script>"); 
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private void Page_Load(object sender, System.EventArgs e)
{
string checkCode = CreateRandomCode(4);
Session["CheckCode"] = checkCode;
CreateImage(checkCode);
......
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