c# - IRC Bot GUI crash? -

ok so, bot connects fine, when create bot, form crashes. bot stays connected !about commands doesnt work. if use same exact code console application works fine. problem ui form

using system; using system.collections.generic; using system.componentmodel; using system.data; using system.drawing; using system.linq; using system.text; using system.threading.tasks; using system.windows.forms; using system.io; using system.net.sockets;  namespace circbot {     public partial class bsetup : form     {         public bsetup()         {             initializecomponent();         }          private void createbotbtn_click(object sender, eventargs e)         {             string buf, nick, owner, server, chan;             int port;             tcpclient sock = new tcpclient();             textreader input;             textwriter output;              //get nick, owner, server, port, , channel user             nick = botnick.text;             owner = botname.text;             server = servername.text;             bool isnumber = int.tryparse(portnum.text, out port);             chan = channelname.text;              if (isnumber == false)             {                 messagebox.show("failed connect. make sure server address , port number correct.", "connection failed", messageboxbuttons.ok, messageboxicon.error);                 return;             }              //connect irc server , input , output text streams tcpclient.             sock.connect(server, port);             if (!sock.connected)             {                 //console.writeline("failed connect!");                 return;             }             else             {                 this.close();                 input = new streamreader(sock.getstream());                 output = new streamwriter(sock.getstream());                  //starting user , nick login commands                  output.write(                    "user " + nick + " 0 * :" + owner + "\r\n" +                    "nick " + nick + "\r\n"                 );                 output.flush();                   //process each line received irc server                 (buf = input.readline(); ; buf = input.readline())                 {                      //display received irc message                     //console.writeline(buf);                      //send pong reply ping messages                     if (buf.startswith("ping ")) { output.write(buf.replace("ping", "pong") + "\r\n"); output.flush(); }                     if (buf[0] != ':') continue;                      /* irc commands come in 1 of these formats:                      * :nick!user@host command args ... :data\r\n                      * :server comand args ... :data\r\n                      */                      //after server sends 001 command, can set mode bot , join channel                     if (buf.split(' ')[1] == "001")                     {                         output.write("mode " + nick + " +b\r\n" + "join " + chan + "\r\n");                         output.flush();                         if (buf.contains("!about"))                         {                              output.writeline("privmsg {0} :" + "i'm shitty little bot coded " + botname, channelname);                             output.flush();                         }                     }                 }             }         }      } } 

this main window, have other form use setup

using system; using system.collections.generic; using system.componentmodel; using system.data; using system.drawing; using system.linq; using system.text; using system.threading.tasks; using system.windows.forms;  namespace circbot {     public partial class mwin : form     {         public mwin()         {             initializecomponent();         }          private void newbottoolstripmenuitem_click(object sender, eventargs e)         {             bsetup bsetup = new bsetup();             bsetup.show();          }          private void quittoolstripmenuitem1_click(object sender, eventargs e)         {             application.exit();         }     } } 

this setup window

i suspect causes problem fact you're doing this.close() , gets disposed. after calling close() go for() , try operate on possibly disposed resources.