p2pFileShareServer p2p File Share Server [C#] Robert Wagner /PreviewSnippet.aspx?SnippetID=db762c3b-642e-4619-8bad-7c7e8a3fc5f2 SurroundsWith

/// The Server class from the FileShare Client/Server Collection /// public class FileShareServer : System.WinForms.Form { ///

/// Required by the Win Forms designer ///

private System.ComponentModel.Container components; private System.WinForms.Label serverl; private System.WinForms.RichTextBox serverlogt; private System.WinForms.ListBox filelistBox; private System.WinForms.Label filesl; private System.WinForms.Label userl; private System.WinForms.ListBox userlistBox; //a instance of your custom dialog private ServerDialog fsd ; //Default values of some variables private int port = 4455 ; private int Maxcon = 5 ; private int clientcount ; private Socket serversocket=null ; private Socket clientsock=null ; private string filedown ; private string fileup ; private bool allowup ; private bool allowdown ; private string password ; private Thread serverthread=null ; private File[] dlfiles ; private System.WinForms.MainMenu mainMenu1; ///

/// The constructor ///

public FileShareServer() { // Required for Win Form Designer support InitializeComponent(); } ///

/// Clean up any resources being used ///

public override void Dispose() { if(serversocket!=null) { //close the server socket serversocket.Close() ; } if(clientsock!=null) { //close the Client socket clientsock.Close() ; } if(serverthread!=null&&serverthread.IsAlive) { //close the server Thread serverthread.Abort() ; } base.Dispose(); components.Dispose(); } ///

/// The main entry point for the application. ///

public static void Main(string[] args) { Application.Run(new FileShareServer()); } ///

/// Required method for Designer support - do not modify /// the contents of this method with an editor ///

private void InitializeComponent() { this.components = new System.ComponentModel.Container(); this.userlistBox = new System.WinForms.ListBox(); this.serverlogt = new System.WinForms.RichTextBox(); this.filelistBox = new System.WinForms.ListBox(); this.mainMenu1 = new System.WinForms.MainMenu(); this.userl = new System.WinForms.Label(); this.serverl = new System.WinForms.Label(); this.filesl = new System.WinForms.Label(); //the Menu MenuItem ServerMenu = new MenuItem("Server"); mainMenu1.MenuItems.Add(ServerMenu); ServerMenu.MenuItems.Add(new MenuItem("Start Server", new EventHandler(startserver))); ServerMenu.MenuItems.Add(new MenuItem("-")); ServerMenu.MenuItems.Add(new MenuItem("Stop Server", new EventHandler(stopserver))); ServerMenu.MenuItems.Add(new MenuItem("-")); ServerMenu.MenuItems.Add(new MenuItem("Exit", new EventHandler(serverexit))); MenuItem ContactMenu = new MenuItem("Contact Me"); mainMenu1.MenuItems.Add(ContactMenu); ContactMenu.MenuItems.Add(new MenuItem("Contact", new EventHandler(contactme))) ; //@design this.TrayHeight = 90; //@design this.TrayLargeIcon = false; //@design this.TrayAutoArrange = true; userlistBox.Location = new System.Drawing.Point(8, 40); userlistBox.Size = new System.Drawing.Size(152, 169); userlistBox.Font = new System.Drawing.Font("Impact", 8f); userlistBox.TabIndex = 0; userlistBox.TabStop = false; serverlogt.ReadOnly = true; serverlogt.Size = new System.Drawing.Size(312, 368); serverlogt.ForeColor = System.Drawing.SystemColors.Window; serverlogt.TabIndex = 0; serverlogt.AutoSize = true; serverlogt.Font = new System.Drawing.Font("Microsoft Sans Serif", 9f, System.Drawing.FontStyle.Bold); serverlogt.AcceptsTab = true; serverlogt.TabStop = false; serverlogt.Location = new System.Drawing.Point(176, 40); serverlogt.BackColor = System.Drawing.Color.Orange; filelistBox.Location = new System.Drawing.Point(8, 240); filelistBox.Size = new System.Drawing.Size(152, 160); filelistBox.HorizontalScrollbar = true; filelistBox.TabIndex = 0; filelistBox.TabStop = false; //@design mainMenu1.SetLocation(new System.Drawing.Point(7, 7)); userl.Location = new System.Drawing.Point(10, 15); userl.Text = "Users Connected"; userl.Size = new System.Drawing.Size(118, 16); userl.AutoSize = true; userl.Font = new System.Drawing.Font("Arial", 10f, System.Drawing.FontStyle.Bold); userl.TabIndex = 0; userl.BackColor = System.Drawing.Color.DarkOrange; serverl.Location = new System.Drawing.Point(176, 16); serverl.Text = "Server Activity Log"; serverl.Size = new System.Drawing.Size(130, 16); serverl.AutoSize = true; serverl.Font = new System.Drawing.Font("Arial", 10f, System.Drawing.FontStyle.Bold); serverl.TabIndex = 0; serverl.BackColor = System.Drawing.Color.DarkOrange; filesl.Location = new System.Drawing.Point(8, 220); filesl.Text = "Files For Download"; filesl.Size = new System.Drawing.Size(132, 16); filesl.AutoSize = true; filesl.Font = new System.Drawing.Font("Arial", 10f, System.Drawing.FontStyle.Bold); filesl.TabIndex = 0; filesl.BackColor = System.Drawing.Color.DarkOrange; this.Text = "FileShare Server , By RLWagner http://www.software-x.net" ; this.AutoScaleBaseSize = new System.Drawing.Size(5, 13); this.AutoScroll = true; this.Menu = mainMenu1; this.BackColor = System.Drawing.SystemColors.Desktop; this.ClientSize = new System.Drawing.Size(492, 413); this.Controls.Add(serverl); this.Controls.Add(serverlogt); this.Controls.Add(filelistBox); this.Controls.Add(filesl); this.Controls.Add(userl); this.Controls.Add(userlistBox); } ///

/// This method is called when 'Start Server' is selected from the Server Menu /// It First brings up the Dialog box to set the server properties /// Then it starts the server based on the properties set by the user ///

private void startserver(object sender , EventArgs e) { //Make a instance of our custom Dialog fsd = new ServerDialog() ; //Get the Result of the Dialog Box DialogResult ret = fsd.ShowDialog(this); //If 'Ok' was pressed on the Dialog box then assign the dialog box values to the server variables if(ret == DialogResult.OK) { //get the properties set in the dialog box this.port=int.Parse(fsd.portt.Text) ; this.Maxcon=int.Parse(fsd.maxt.Text) ; this.fileup = fsd.fileupt.Text ; this.filedown=fsd.filedlt.Text ; this.allowup=fsd.allowup.Checked ; this.allowdown=fsd.allowdl.Checked ; this.password=fsd.passt.Text ; if(!Directory.DirectoryExists(filedown)) { MessageBox.Show(this,"The directory to Download Files Does not Exist \n Try Starting Again"); } else if(!Directory.DirectoryExists(fileup)) { MessageBox.Show(this,"The directory to Upload Files Does not Exist \n Try Starting Again"); } else { //Call a function which will get all the files in the "Download" directory //of the server GetDirs(); //Start the Main Server Thread which will wait for users to connect serverthread = new Thread(new ThreadStart(InitilizeSocket)); serverthread.Start() ; } } } ///

/// This method is called when 'Stop Server' is selected from the server Menu /// It closes down all the threads and Sockets open ///

private void stopserver(object sender, EventArgs e) { if(serversocket!=null) { //close the server socket serversocket.Close() ; } if(clientsock!=null) { //close the Client socket clientsock.Close() ; } if(serverthread!=null&&serverthread.IsAlive) { //close the server Thread serverthread.Abort() ; } filelistBox.Items.Clear(); userlistBox.Items.Clear(); serverlogt.Text+="Server Shutdown !! \n" ; } ///

/// This method exits the Server Application ///

private void serverexit(object sender, EventArgs e) { Dispose(); } ///

/// Info About Me ///

private void contactme(object sender, EventArgs e) { MessageBox.Show(this,"This is the FileShare Server,\n E-mail: your@email.com \n Website:http//www.MasterCSharp.com") ; } ///

/// This method Gets all the fles in the Directory set by the user from where the user can /// download files. It stores this in the ListBox on the Server ///

private void GetDirs() { //check if the directory specified by the user exists if(Directory.DirectoryExists(filedown)&&allowdown) { //store all the file names in a Array dlfiles = Directory.GetFilesInDirectory(filedown) ; foreach (File f in dlfiles) { //Insert the Items into the ListBox filelistBox.InsertItem(0,f); } } } ///

/// /// This is the main method which does all the Initial work to start-up the server /// /// /// It runs in a while loop and accepts new Clients till the Max client capacity /// specified by the user is reached. /// Once Its there it stops acception new users /// ///

public void InitilizeSocket() { //create a Socket of the Protocal TCP serversocket = new Socket(AddressFamily.AfINet,SocketType.SockStream,ProtocolType.ProtTCP); serversocket.Blocking = true ; //Bind to the port specified by the user if(serversocket.Bind(new IPEndPoint(IPAddress.InaddrAny,port)) != 0) { serverlogt.Text+="Unable to bind to port:"+port.ToString()+" \n" ; } //start listning for new Clients serversocket.Listen(-1) ; serverlogt.Text+="Starting to listen on port :"+port.ToString()+" \n" ; try{ while(true) { //Accept a new user Socket sock = serversocket.Accept() ; //Increase the clientcount (i.e. The number of clients connected to the server clientcount+=1 ; //if client count is satisfied if(sock!=null&&clientcount<=Maxcon) { serverlogt.Text+="Client Connected \n" ; clientsock = sock ; if(clientsock!=null) { //Accept the new Client and Start A seprate Thread for the New Client Thread lis = new Thread(new ThreadStart(listensend)) ; lis.Start() ; } } else { //If Max COnnections are reached then Disconnect the user SendMessage(clientsock,"NOPE Server Readched Max Limit") ; clientsock.Close(); clientcount-=1; } } } catch(Exception ed) { MessageBox.Show(this,"Error Cannot Accept Clients !! "+ed.ToString()) ; } } ///

/// This is the Method which get called for each connected Client /// It Takes care of all the Receving and Sending ///

public void listensend() { //Get a copy of the Client Socket Socket mySocket = clientsock ; //SendMessage is a Custom Method we have written below SendMessage(mySocket , "CONN Welcome to File Share Server" ) ; //Variable to check to connection bool DoNotExit=true ; while(DoNotExit) { string ClientCommand ; //A byte array to store the Received Command byte[] recs = new byte[2048]; try{ //Receive a Message from Client int rcount = mySocket.Receive(recs,recs.Length,0) ; //Decode the Message string clientmessage = System.Text.Encoding.ASCII.GetString(recs) ; if(rcount>0) { //Call a Custom Method writen below to Parse the Message sent by the client ClientCommand =ParseMessage(clientmessage) ; } else { //a command to do Nothing ClientCommand="NOOP" ; } //Call a Custom Method writen below to Take Action According to the Message Sent DoNotExit = ParseCommand(ClientCommand , clientmessage , mySocket) ; } catch(Exception e) { MessageBox.Show(this,"a Exception occured in client thread :"+e.ToString()) ; } } } ///

/// This method Sends the input message on the Given Socket ///

private void SendMessage(Socket sendsock , string message) { byte[] sender = System.Text.Encoding.ASCII.GetBytes(message.ToCharArray()) ; sendsock.Send(sender, sender.Length,0) ; } ///

/// This Method returns the Command Sent by the client from the Message sent by the Client ///

private string ParseMessage(string mess) { string ClientCommand ; if(mess=="") { //return a standard command return "NOOP" ; } //All commands used in this example are of 4 Bytes hence we substring //the first 4 bytes of the total Message sent by the user ClientCommand = mess.Substring(0,4) ; return ClientCommand ; } ///

/// This Method inputs the Client Command , Message and Socket /// Based on the client command it takes the necessary action ///

private bool ParseCommand(string ClientCommand , string clientmessage , Socket mySocket) { //When the Client Connects It sends a USER command if(ClientCommand=="USER") { string temp = clientmessage.Substring(4) ; string mes= temp.Trim() ; serverlogt.Text+="User :"+mes; serverlogt.Text+="\t" ; serverlogt.Text+=mySocket.RemoteEndpoint.ToString(); serverlogt.Text+="\n" ; //Add the User to the ListBox userlistBox.InsertItem(0,mes) ; //In response to the USER command we send the user the FileNames //of All the files available for download SendMessage(mySocket,senddirectory()) ; return true ; } //NOOP is a command to do Nothing .. if(ClientCommand=="NOOP") { //Thread.Sleep(1000) ; return true ; } //Client sends this Command in reply of a Error if(ClientCommand=="OHHH") { return true ; } //When the Client Quits a QUIT comand is Sent if(ClientCommand=="QUIT") { string temp = clientmessage.Substring(4) ; string mes= temp.Trim() ; int i =userlistBox.FindStringExact(mes) ; serverlogt.Text+=mes+" Has Quit \n " ; //Decrease the total Count of users connected to the Server clientcount-=1; } //If a file is downloaded then the client Sends the Command if(ClientCommand=="RECD") { return true ; } // When a Client wants to download a file, it sends the DOWN command // along with the filename it wants to Download //In response the server sends the Size of the File requested if(ClientCommand=="DOWN") { bool check =false ; string temp = clientmessage.Substring(4) ; string mes= temp.Trim() ; string fullpath =filedown+mes ; //Make a file out of the sent filename File ftemp=new File(filedown+mes) ; check=true ; if(check&&allowdown) { //If the File is Found and Download is Allowed by the server //then sends the file size with the SIZE command SendMessage(mySocket,"SIZE "+ftemp.Length.ToString()) ; ftemp=null ; } else if(check&&!allowdown) { SendMessage(mySocket,"NOPE Download not Allowed!") ; } else { SendMessage(mySocket, "NOPE FileNotFound") ; } ftemp=null ; return true ; } //This is the Second command the in the Downloading of a File by the client //on receving the File Size the client sends the SEND command //In response the server sends the file to the client if(ClientCommand=="SEND") { try{ File ftemp; string temp = clientmessage.Substring(4) ; string mes= temp.Trim() ; ftemp =new File(filedown+mes) ; //Get the Length of the file requested //and set various variables long total=ftemp.Length ; long rdby=0 ; int len=0 ; byte[] buffed = new byte[4096] ; //Open the file requested for download FileStream fin = new FileStream(filedown+mes,FileMode.Open , FileAccess.Read) ; //One way of transfer over sockets is Using a NetworkStream //It provides some useful ways to transfer data NetworkStream nfs = new NetworkStream(mySocket) ; //lock the Thread here lock(this){ while(rdby0) { //Below we Calculate the Size of bytes to be written if(j>=4096&&(size-rdby)>=4096) { v=4096 ; } else if(j<4096 &&(size-rdby)>=4096) { v= j; } else { v=(size-rdby) ; } //Write the Bytes to the New File fout.Write(writer,0,(int)v) ; //Increase the Counter rdby=rdby+v ; } } //Close the FileStream And Send a RECD command to the Client in //confirmation of File Recipt fout.Close() ; SendMessage(mySocket,"RECD File Received Properly") ; serverlogt.Text+="Received File !!\n" ; return true ; } catch(Exception eg) { SendMessage(mySocket,"RECD Error in File Trensfer") ; MessageBox.Show(this,"Exception occured in Upload:"+eg.ToString()); } return true ; } else { SendMessage(mySocket, "NOPE Server upload Disabled") ; return true ; } } return false ; } ///

/// This method Builds a custom string containing the file names of all /// the Files the Server allow to download ///

private string senddirectory() { string files="LIST " ; foreach(File f in dlfiles) { files+="@"+f.ToString() ; } return files ; } }//class ///

/// A Custom Dialog class. Used to set the Server Properites ///

public class ServerDialog: Form { private System.ComponentModel.Container components; private System.WinForms.ToolTip toolTip1; private System.WinForms.Button defaultb; public System.WinForms.CheckBox allowup; public System.WinForms.CheckBox allowdl; public System.WinForms.TextBox filedlt; private System.WinForms.Label fdll; public System.WinForms.TextBox passt; private System.WinForms.Label passl; public System.WinForms.TextBox maxt; private System.WinForms.Label maxl; private System.WinForms.Button cancelb; private System.WinForms.Button okb; public System.WinForms.TextBox fileupt; private System.WinForms.Label fupl; public System.WinForms.TextBox portt; private System.WinForms.Label portl; private System.WinForms.Label lb1; ///

/// Constructor ///

public ServerDialog() { InitializeComponent(); } ///

/// Free resources ///

public override void Dispose() { base.Dispose(); components.Dispose(); } ///

/// Initilize WinForm Components ///

private void InitializeComponent() { this.components = new System.ComponentModel.Container(); this.passt = new System.WinForms.TextBox(); this.filedlt = new System.WinForms.TextBox(); this.maxl = new System.WinForms.Label(); this.allowup = new System.WinForms.CheckBox(); this.passl = new System.WinForms.Label(); this.portl = new System.WinForms.Label(); this.cancelb = new System.WinForms.Button(); this.toolTip1 = new System.WinForms.ToolTip(components); this.portt = new System.WinForms.TextBox(); this.fileupt = new System.WinForms.TextBox(); this.maxt = new System.WinForms.TextBox(); this.fdll = new System.WinForms.Label(); this.lb1 = new System.WinForms.Label(); this.defaultb = new System.WinForms.Button(); this.fupl = new System.WinForms.Label(); this.allowdl = new System.WinForms.CheckBox(); this.okb = new System.WinForms.Button(); //@design this.TrayHeight = 90; //@design this.TrayLargeIcon = false; //@design this.TrayAutoArrange = true; passt.Location = new System.Drawing.Point(192, 104); passt.PasswordChar = '*'; toolTip1.SetToolTip(passt, "Enter the Password For the Clients to Connect to t" + "he Server. Not Implimented Yet"); passt.TabIndex = 3; passt.Size = new System.Drawing.Size(128, 20); filedlt.Location = new System.Drawing.Point(192, 168); filedlt.Text = "Server\\Download\\"; toolTip1.SetToolTip(filedlt, "Enter the Directory from which Clients can Download Files."); filedlt.TabIndex = 5; filedlt.Size = new System.Drawing.Size(176, 20); maxl.Location = new System.Drawing.Point(8, 72); maxl.Text = "Max No. of Clients"; maxl.Size = new System.Drawing.Size(168, 16); maxl.Font = new System.Drawing.Font("Arial", 10f, System.Drawing.FontStyle.Bold); maxl.TabIndex = 0; maxl.BackColor = System.Drawing.Color.DarkOrange; allowup.Checked = true; allowup.Location = new System.Drawing.Point(8, 232); allowup.Text = "Clients Can Upload Files To Server ?"; allowup.Size = new System.Drawing.Size(296, 16); allowup.CheckState = System.WinForms.CheckState.Checked; allowup.FlatStyle = System.WinForms.FlatStyle.Popup; allowup.Font = new System.Drawing.Font("Arial", 10f, System.Drawing.FontStyle.Bold); toolTip1.SetToolTip(allowup, "When checked Clients will be able to Upload Files to Server."); allowup.TabIndex = 7; allowup.BackColor = System.Drawing.Color.DarkOrange; passl.Location = new System.Drawing.Point(8, 104); passl.Text = "Password"; passl.Size = new System.Drawing.Size(168, 16); passl.Font = new System.Drawing.Font("Arial", 10f, System.Drawing.FontStyle.Bold); passl.TabIndex = 0; passl.BackColor = System.Drawing.Color.DarkOrange; portl.Location = new System.Drawing.Point(8, 40); portl.Text = "Port to Listen"; portl.Size = new System.Drawing.Size(168, 16); portl.Font = new System.Drawing.Font("Arial", 10f, System.Drawing.FontStyle.Bold); portl.TabIndex = 0; portl.BackColor = System.Drawing.Color.DarkOrange; cancelb.Location = new System.Drawing.Point(192, 272); cancelb.DialogResult = System.WinForms.DialogResult.Cancel; cancelb.Size = new System.Drawing.Size(72, 24); cancelb.TabIndex = 9; cancelb.Text = "Cancel"; //@design toolTip1.SetLocation(new System.Drawing.Point(7, 7)); toolTip1.Active = true; portt.Location = new System.Drawing.Point(192, 40); portt.Text = "4455"; toolTip1.SetToolTip(portt, "Enter the Port you want the Clients to Connect Default :" + " 4455"); portt.TabIndex = 1; portt.Size = new System.Drawing.Size(128, 20); fileupt.Location = new System.Drawing.Point(192, 136); fileupt.Text = "Server\\Upload"; toolTip1.SetToolTip(fileupt, "Enter the Directory where Client Uploaded Files will be Stor" + "ed."); fileupt.TabIndex = 4; fileupt.Size = new System.Drawing.Size(176, 20); maxt.Location = new System.Drawing.Point(192, 72); maxt.Text = "5"; toolTip1.SetToolTip(maxt, "Enter the Maximum No. of Clients that can Connect to the " + "Server at a Given Time."); maxt.TabIndex = 2; maxt.Size = new System.Drawing.Size(128, 20); fdll.Location = new System.Drawing.Point(8, 168); fdll.Text = "File Download Directory"; fdll.Size = new System.Drawing.Size(168, 16); fdll.Font = new System.Drawing.Font("Arial", 10f, System.Drawing.FontStyle.Bold); fdll.TabIndex = 0; fdll.BackColor = System.Drawing.Color.DarkOrange; lb1.Location = new System.Drawing.Point(26, 8); lb1.Text = "Set The Server Properties"; lb1.Size = new System.Drawing.Size(340, 16); lb1.ForeColor = System.Drawing.SystemColors.Window; lb1.Font = new System.Drawing.Font("Microsoft Sans Serif", 11f, System.Drawing.FontStyle.Bold); lb1.TabIndex = 0; lb1.BackColor = System.Drawing.Color.DarkOrange; lb1.TextAlign = System.WinForms.HorizontalAlignment.Center; defaultb.Location = new System.Drawing.Point(296, 272); toolTip1.SetToolTip(defaultb, "Reset the form to default values"); defaultb.Size = new System.Drawing.Size(72, 24); defaultb.TabIndex = 10; defaultb.Text = "Defaults"; defaultb.Click += new System.EventHandler(defaultb_click); fupl.Location = new System.Drawing.Point(8, 136); fupl.Text = "File Upload Directory"; fupl.Size = new System.Drawing.Size(168, 16); fupl.Font = new System.Drawing.Font("Arial", 10f, System.Drawing.FontStyle.Bold); fupl.TabIndex = 0; fupl.BackColor = System.Drawing.Color.DarkOrange; allowdl.Checked = true; allowdl.Location = new System.Drawing.Point(8, 200); allowdl.Text = "Clients Can Download Files From Server?"; allowdl.Size = new System.Drawing.Size(296, 16); allowdl.CheckState = System.WinForms.CheckState.Checked; allowdl.FlatStyle = System.WinForms.FlatStyle.Popup; allowdl.Font = new System.Drawing.Font("Arial", 10f, System.Drawing.FontStyle.Bold); toolTip1.SetToolTip(allowdl, "When Checked Clients can Download Files from the" + " Server."); allowdl.TabIndex = 6; allowdl.BackColor = System.Drawing.Color.DarkOrange; okb.Location = new System.Drawing.Point(88, 272); okb.Size = new System.Drawing.Size(72, 24); okb.TabIndex = 8; okb.Text = "OK"; okb.DialogResult = DialogResult.OK; okb.Click += new System.EventHandler(okb_click); this.Text = "Set Server Properties"; this.MaximizeBox = false; this.AutoScaleBaseSize = new System.Drawing.Size(5, 13); this.CancelButton = cancelb; this.BorderStyle = System.WinForms.FormBorderStyle.Fixed3D; this.ShowInTaskbar = false; this.AcceptButton = okb; this.MinimizeBox = false; this.BackColor = System.Drawing.SystemColors.Desktop; this.ClientSize = new System.Drawing.Size(398, 307); this.Controls.Add(defaultb); this.Controls.Add(allowup); this.Controls.Add(allowdl); this.Controls.Add(filedlt); this.Controls.Add(fdll); this.Controls.Add(passt); this.Controls.Add(passl); this.Controls.Add(maxt); this.Controls.Add(maxl); this.Controls.Add(cancelb); this.Controls.Add(okb); this.Controls.Add(fileupt); this.Controls.Add(fupl); this.Controls.Add(portt); this.Controls.Add(portl); this.Controls.Add(lb1); } ///

/// Method called when the 'Cancel' button is clicked ///

private void ServerDialog_closing(Object source, CancelEventArgs e) { e.Cancel = true; } ///

/// Method called when the 'Ok' button is clicked ///

private void okb_click(object sender, System.EventArgs e) { //Validate the Form if(portt.Text=="") { MessageBox.Show(this,"Please Enter a Port to Listen") ; return ; } if(maxt.Text=="") { maxt.Text="1" ; return ; } if(allowdl.Checked&&filedlt.Text=="") { MessageBox.Show(this,"Please Enter the Directory from where Clients can Download Files") ; return ; } else { char last = filedlt.Text[filedlt.Text.Length-1]; if('\\'!=last) { filedlt.Text+="\\" ; } } if(allowup.Checked&&fileupt.Text=="") { MessageBox.Show(this,"Please Enter the Directory where Clients can Upload Files") ; return ; } else { char last = fileupt.Text[fileupt.Text.Length-1]; if('\\'!=last) { fileupt.Text+="\\" ; } } } ///

/// Method called when Default button is clicked ///

protected void defaultb_click(object sender, System.EventArgs e) { portt.Text="4455" ; maxt.Text="5" ; passt.Text="" ; fileupt.Text="\\localhost\\Upload\\" ; filedlt.Text="\\localhost\\Download\\" ; allowup.Checked=true ; allowdl.Checked=true ; } } } ]]>