Simple Notepad function Implementation code-(Stream reader)

usingSystem;usingSystem.Collections.Generic;usingSystem.ComponentModel;usingSystem.Data;usingSystem.Drawing;usingSystem.Linq;usingSystem.Text;usingSystem.Windows.Forms;usingSystem.IO;//Import Namespaces--streamnamespacewindowsformsapplication2{ Public Partial classForm1:form { PublicForm1 () {InitializeComponent (); }        Private voidShear Ttoolstripmenuitem_click (Objectsender, EventArgs e)        {textbox1.cut (); }        Private voidCopy Ctoolstripmenuitem_click (Objectsender, EventArgs e)        {textbox1.copy (); }        Private voidPaste Ptoolstripmenuitem_click (Objectsender, EventArgs e)        {Textbox1.paste (); }        Private voidSelect All Atoolstripmenuitem_click (Objectsender, EventArgs e)        {Textbox1.selectall (); }        Private voidUndo Utoolstripmenuitem_click (Objectsender, EventArgs e)        {Textbox1.undo (); }        Private stringFileName; Private voidOpen Otoolstripmenuitem_click (Objectsender, EventArgs e) {            //Create Open File dialog box: Help us to find the file path on the hard disk//OpenFileDialog openfiledialog1 = new OpenFileDialog ();//Creating ObjectsOpenfiledialog1.filter ="text files |*.txt| All files |*.*";//FilterDialogResult isOK = Openfiledialog1.showdialog ();//Show dialog Box            if(isOK = = DialogResult.OK)//The return value of the dialog box determines whether the point's Open button            {                 //Get file path                stringfilename =Openfiledialog1.filename; FileName=filename; //read files According to file path: Using streams to read//FileStream fs = new FileStream (Filename,filemode.open); //StreamReader sr = new StreamReader (fs,encoding.default);//Stream Reader--encoding.default select default encodingStreamReader sr =NewStreamReader (Filename,encoding.default); stringText = Sr. ReadToEnd ();//ReadSr.               Close (); //FS. Close ();TextBox1.Text=text; }        }        Private voidSave Stoolstripmenuitem_click (Objectsender, EventArgs e) {            if(FileName! ="") {FileStream fs=NewFileStream (FileName, FileMode.Create); StreamWriter SW=NewStreamWriter (FS, Encoding.default);//Stream WriteSW.                Write (TextBox1.Text); Sw.                Close (); Fs.            Close (); }            Else{SaveFileDialog Savefiledialog1=NewSaveFileDialog (); Savefiledialog1. Filter="text files |*.txt| All files |*.*"; DialogResult isOK=Savefiledialog1.                ShowDialog (); if(isOK = =DialogResult.OK) {stringfilename =Savefiledialog1.                    FileName; FileStream FS=NewFileStream (filename, filemode.create); StreamWriter SW=NewStreamWriter (FS, Encoding.default);//Stream WriteSW.                    Write (TextBox1.Text); Sw.                    Close (); Fs.                Close (); }            }        }        Private voidExit Xtoolstripmenuitem_click (Objectsender, EventArgs e) {             This.        Close (); }        Private voidFind Toolstripmenuitem_click (Objectsender, EventArgs e) {Form2 F=NewForm2 (Textbox1.selectedtext, This); F.owner= This;        F.show (); }        Private voidReplace Toolstripmenuitem_click (Objectsender, EventArgs e) {                   }        Private voidPrint Preview Vtoolstripmenuitem_click (Objectsender, EventArgs e)        {Printpreviewdialog1.showdialog (); }        Private voidPrint Ptoolstripmenuitem_click (Objectsender, EventArgs e) {printdialog1.document= PrintDocument1;//Specify the Print object that corresponds to the Print dialog boxDialogResult isOK =Printdialog1.showdialog (); if(isOK = =DialogResult.OK) {printdocument1.print ();//Print a document            }        }        Private voidPrintdocument1_printpage (Objectsender, System.Drawing.Printing.PrintPageEventArgs e) {            //Set Print contentFont f =NewSystem.Drawing.Font ("Song Body",6); E.graphics.drawstring (Textbox1.text,f,system.drawing.brushes.black,NewPointF (0,0)); }    }}

Using a stream reader to note a reference to a namespace

Simple Notepad function Implementation code-(Stream reader)