c# - Attempted to read or write protected memory. This is often an indication that other memory is corrupt. when using OpenFileDialog -

i using open file dialog dragged toolbox onto form. file dialog working fine until recently.

i've searched high , low answer online none of them work. started project on home computer , copied whole project folder work computer can work on both @ home , @ work.

the file dialog works fine on work computer after make changes code (at work) , copy new project folder home computer issue occurs. not managed in tfs or other shared location. private project working on. code issue occurs below:

thread th;         private void btnuploadtodb_click(object sender, eventargs e) {     try     {          openfiledialog1.title = "select new data file";         openfiledialog1.filter = "excel files |*.xlsx";          if (openfiledialog1.showdialog() == dialogresult.ok)         {             string filepath = openfiledialog1.filename;         }         else if (dialogresult == dialogresult.none)         {             return;         }          th = new thread(uploadtodb);         control.checkforillegalcrossthreadcalls = false;         th.start();     }     catch (exception ex)     {         messagebox.show(ex.message);     }         {         gc.collect();     } } 

the stack trace when error occurs below:

system.accessviolationexception unhandled message=attempted read or write protected memory. indication other memory corrupt. source=system.windows.forms stacktrace: @ system.windows.forms.filedialognative.ifiledialog.show(intptr parent) @ system.windows.forms.filedialog.rundialogvista(intptr hwndowner) @ system.windows.forms.filedialog.rundialog(intptr hwndowner) @ system.windows.forms.commondialog.showdialog(iwin32window owner) @ system.windows.forms.commondialog.showdialog() @ form1.form1.btnuploaddata_click(object sender, eventargs e) in c:\users\user1\documents\visual studio 2010\projects\c#_projects\c# projects\solution 1\solution 1\form1.cs:line 458 @ system.windows.forms.control.onclick(eventargs e) @ system.windows.forms.button.onclick(eventargs e) @ system.windows.forms.button.onmouseup(mouseeventargs mevent) @ system.windows.forms.control.wmmouseup(message& m, mousebuttons button, int32 clicks) @ system.windows.forms.control.wndproc(message& m) @ system.windows.forms.buttonbase.wndproc(message& m) @ system.windows.forms.button.wndproc(message& m) @ system.windows.forms.control.controlnativewindow.onmessage(message& m) @ system.windows.forms.control.controlnativewindow.wndproc(message& m) @ system.windows.forms.nativewindow.debuggablecallback(intptr hwnd, int32 msg, intptr wparam, intptr lparam) @ system.windows.forms.unsafenativemethods.dispatchmessagew(msg& msg) @ system.windows.forms.application.componentmanager.system.windows.forms.unsafenativemethods.imsocomponentmanager.fpushmessageloop(intptr dwcomponentid, int32 reason, int32 pvloopdata) @ system.windows.forms.application.threadcontext.runmessageloopinner(int32 reason, applicationcontext context) @ system.windows.forms.application.threadcontext.runmessageloop(int32 reason, applicationcontext context) @ system.windows.forms.application.run(form mainform) @ form1.program.main() in c:\users\user1\documents\visual studio 2010\projects\c#_projects\c# projects\solution 1\solution 1\program.cs:line 18 @ system.appdomain._nexecuteassembly(runtimeassembly assembly, string[] args) @ system.appdomain.executeassembly(string assemblyfile, evidence assemblysecurity, string[] args) @ microsoft.visualstudio.hostingprocess.hostproc.runusersassembly() @ system.threading.threadhelper.threadstart_context(object state) @ system.threading.executioncontext.run(executioncontext executioncontext, contextcallback callback, object state, boolean ignoresyncctx) @ system.threading.executioncontext.run(executioncontext executioncontext, contextcallback callback, object state) @ system.threading.threadhelper.threadstart() innerexception:

further, tried creating empty project on home computer issue occurs , added openfiledialog in same manner , works fine. issue seems application , when on home machine.

i adding updatetodb method requested. have modified values there might lines don't make sense, however, believe not relevant issue @ hand.

private void uploadtodb() {     try     {         string values = "";         string excelconstring = @"provider=microsoft.ace.oledb.12.0;data source='" +                 filepath + "'; extended properties='excel 12.0 xml;hdr=yes;imex=1;'";         string excelsql = "select * [sheet1$]";         string accessconstring = globaloledbcommands.dbconstring;          string accesssql = "delete table1";         globaloledbcommands.commandexecutenonquery(accesssql, accessconstring);          using (oledbdataadapter adap = new oledbdataadapter(excelsql, excelconstring))         {             using (datatable dt = new datatable())             {                 adap.fill(dt);                  using (oledbconnection accesscon = new oledbconnection(accessconstring))                 {                     accesscon.open();                      (int = 0; < dt.rows.count - 1; i++)                     {                          (int j = 0; j <= dt.columns.count - 1; j++)                         {                             values = values.trim() + dt.rows[i][j] + ",";                         }                         values = strings.left(values, (strings.len(values) - 1));                          string value1 = splitandreturntext(values, ",", 0);                         string value2 = splitandreturntext(values, ",", 1);                         string value3 = splitandreturntext(values, ",", 2);                         string value4 = splitandreturntext(values, ",", 3);                          accesssql = "insert table1 (value1,value2,value3,value4) values(@value1,@value2,@value3,@value4)";                          using (oledbcommand dttoaccesscmd = new oledbcommand(accesssql, accesscon))                         {                             dttoaccesscmd.parameters.addwithvalue("@value1", value1);                             dttoaccesscmd.parameters.addwithvalue("@value2", value2);                             dttoaccesscmd.parameters.addwithvalue("@value3", system.threading.thread.currentthread.currentculture.textinfo.totitlecase(value3.tolower()));                             dttoaccesscmd.parameters.addwithvalue("@value4", value4);                             try                             {                                 dttoaccesscmd.executenonquery();                             }                             catch (exception)                             {                              }                              this.lblprogress.text = (i + "/" + ((dt.rows.count) - 1)).tostring();                             this.lblprogress.refresh();                         }                         // reset value variable null.                         values = "";                     }                 }             }         }          accesssql = "select max(end_time) table1 user_name='" +                     environment.username + "'";          datetime start_time = convert.todatetime(globaloledbcommands.         commandexecutescalar(accesssql, globaloledbcommands.dbconstring));         datetime end_time = datetime.now;         double total_time = (end_time - start_time).totalminutes;          string fieldvalues = "start_time, end_time, user_name, task_name, total_time,task_count";         accesssql = "insert table1 (" + fieldvalues + ") values ('" +                     start_time + "','" + datetime.now + "','" + environment.username +                     "','update db','" + total_time + "','1')";         globaloledbcommands.commandexecutenonquery(accesssql, globaloledbcommands.dbconstring);          messagebox.show("new data added ");         this.lblprogress.text = "";      }     catch (exception ex)     {         messagebox.show(ex.message);     } 

could please advise causing issue not able work on changes code @ home fear not work when transfer work machine.

to run code on deploy computer 1 of 2 things must occur 1) exact same version of net library must on both computers including updates. 2) must publish application on build computer , run setup.exe folder created on build computer on deploy computer.

you can't copy exe 1 computer another.