Verifying the true format of uploaded files

1         /// <summary>2         ///verifying the true format of uploaded files3         /// </summary>4         /// <param name= "FileUpload" ></param>5         /// <returns></returns>6         Private BOOLvalidationfile (httppostedfile fileUpload)7         {8Httppostedfile file =FileUpload;9BinaryReader r =NewBinaryReader (fileupload.inputstream);Ten             stringBX =" "; One             bytebuffer; A             Try -             { -Buffer =r.readbyte (); theBX =buffer. ToString (); -Buffer =r.readbyte (); -BX + =buffer. ToString (); -             } +             Catch(Exception) -             { +Response.Write ("file format is wrong! "); A Response.End (); at             } -  -             BOOLisOK =false; -             foreach(intIteminchEnum.getvalues (typeof(fileextension))) -             { -                 if(item. ToString () = =BX) in                 { -isOK =true; to                      Break; +                 } -             } the  *             returnisOK; $         }Panax Notoginseng  -         /// <summary> the         ///true format of uploaded files +         /// </summary> A          Public enumfileextension the         { +JPG =255216, -GIF =7173, $BMP =6677, $PNG =13780 -             //COM = 7790, -             //EXE = 7790, the             //DLL = 7790, -             //RAR = 8297,Wuyi             //ZIP = 8075, the             //XML = 6063, -             //HTML = 6033, Wu             //ASPX = 239187, -             //CS = 117115, About             //JS = 119105, $             //TXT = 210187, -             //SQL = 255254, -             //BAT = 64101, -             //btseed = 10056, A             //RDP = 255254, +             //PSD = 5666, the             //PDF = 3780, -             //CHM = 7384, $             //LOG = 70105, the             //REG = 8269, the             //HLP = 6395, the             //DOC = 208207, the             //XLS = 208207, -             //DOCX = 208207, in             //XLSX = 208207, the            //txt:4950 the}

Verifying the true format of uploaded files