Learn about C # File upload classes, file streams, byte arrays, and more

Using system;using system.io;using system.web;using system.web.ui.webcontrols;namespace DotNet.Utilities{//< summary>///File Upload class///</summary> public class Fileup {public Fileup () {}//        <summary>//Convert to byte array///</summary>/<param name= "filename" > file name </param> <returns> byte array </returns> public byte[] Getbinaryfile (string filename) {if (                File.exists (filename)) {FileStream Fsm = null;                    try {Fsm = file.openread (filename); return this.                Convertstreamtobytebuffer (FSM);                } catch {return new byte[0];                } finally {fsm.close ();            }} else {return new byte[0];     }   }///<summary>///flow into byte array///</summary>//<param name= "Thestream" > Stream </param>//<returns> byte array </returns> public byte[] Convertstreamtobytebuffer (System.IO.Str            EAM thestream) {int bi;            MemoryStream tempstream = new System.IO.MemoryStream (); try {while (bi = Thestream.readbyte ())! =-1) {TEMPSTREAM.W                Ritebyte (((byte) bi));            } return Tempstream.toarray ();            } catch {return new byte[0];            } finally {tempstream.close (); }}///<summary>//Upload file///</summary>//<param name= "Posphotouploa D "> Controls </param>//<param name=" Savefilename "> Saved filenames </param>///<param name=" Imagepa Th "> Saved file path </param> public string Filesc (FileUpload posphotoupload, String savefilename, String imagePath) {            string state = "";                if (posphotoupload.hasfile) {if (posphotoupload.postedfile.contentlength/1024 < 10240)                    {string MimeType = PosPhotoUpload.PostedFile.ContentType; if (String.Equals (MimeType, "Image/gif") | | String.Equals (MimeType, "Image/pjpeg")) {string extfilestring = System.IO.Path.                        GetExtension (PosPhotoUpload.PostedFile.FileName);                    PosPhotoUpload.PostedFile.SaveAs (HttpContext.Current.Server.MapPath (ImagePath));                    } else {state = "Incorrect upload file type";                }} else {state = "Upload file cannot be greater than 10M";        }} else {        state = "File not uploaded";        } return state; }///<summary>//Upload file///</summary>//<param name= "Bindata" > byte array </p aram>//<param name= "filename" > FileName </param>//<param name= "fileType" > File type </param&        Gt        -------------------call----------------------//byte[] by = Getbinaryfile ("E:\\hello.txt"); This.        SaveFile (By, "Hello", ". txt"); ---------------------------------------------public void SaveFile (byte[] bindata, String fileName, String filety            PE) {FileStream FileStream = null;            MemoryStream m = new MemoryStream (bindata);                try {string savepath = HttpContext.Current.Server.MapPath ("~/file/"); if (!                Directory.Exists (Savepath)) {directory.createdirectory (Savepath); } string File = Savepath + fileName + FileType;                FileStream = new FileStream (File, FileMode.Create);            M.writeto (FileStream);                } finally {m.close ();            Filestream.close (); }        }    }}