vb.net - error deleting from database -


i have sql server compact database created through vs 2010 (local database file option). on form load (categoryform) load values database datagridview1. add buttoncolumn programmatically use delete part. problem this:

  • on initial form load, first time press delete on row, works. if press again not work.
  • the second time click button, printed text on msgbox, text of button! (delete) (screenshot included) p.s mentionted below, when comment-out stuff, correct values returned.

what tried:

  • commented out sql-related, left part rowindex , value @ specific cell @ index. print them both on msgbox. values correct. example, 0 index , value test first row text test.

below progress screenshots:

cellcontentclick method:

private sub datagridview1_cellcontectclick(byval sender object, byval e system.windows.forms.datagridviewcelleventargs) handles datagridview1.cellcontentclick      dim string      'if e.columnindex = 1     'if e.rowindex >= 0 , e.rowindex <= datagridview1.rows.count - 1      = datagridview1.rows(e.rowindex).cells(0).value.tostring     msgbox(e.rowindex)     msgbox(i)     sqlstringdelete = "delete category categoryname = '" & & "'"     sqlconn.connectionstring = connstring 'set connection string     sqlconn.open() 'open connection     sqlcmd.connection = sqlconn 'sets connection use sql command     sqlcmd.commandtext = sqlstringdelete 'sets sql string     sqlcmd.executenonquery() 'executes sql command      'create adapter     dim dataadapter sqlcedataadapter = new sqlcedataadapter("select categoryname category", sqlconn)     'create dataset     dim dataset new dataset     'fill datset     dataadapter.fill(dataset)     'attach dataset datagrid     datagridview1         .datasource = dataset.tables(0)         .columns(0).headertext = ""         .columns(0).autosizemode = datagridviewautosizecolumnmode.fill     end      dataadapter = nothing     dataset = nothing      sqlconn.close() 'close connection    end sub

form_load method:

 private sub categoryform_load(byval sender system.object, byval e system.eventargs) handles mybase.load         sqlconn.connectionstring = connstring 'set connection string         sqlconn.open() 'open connection          'create adapter         dim dataadapter sqlcedataadapter = new sqlcedataadapter("select categoryname category", sqlconn)         'create dataset         dim dataset new dataset         'fill datset         dataadapter.fill(dataset)         'attach dataset datagrid         datagridview1             .datasource = dataset.tables(0)             .columns(0).headertext = ""             .columns(0).autosizemode = datagridviewautosizecolumnmode.fill         end          dataadapter = nothing         dataset = nothing         sqlconn.close()          buttoncolumn             .name = "deletebuttoncolumn"             .headertext = ""             .text = "delete"             .usecolumntextforbuttonvalue = true             .autosizemode = datagridviewautosizecolumnmode.fill             .width = 50         end          if datagridview1.columns.count = 1             datagridview1.columns.add(buttoncolumn)         end if      end sub

screenshots:

button text returned instead of cell value

still there after several click :)

turns out columns autoregenerating causing column re-arrangement on each second click. set datagridview1.autogeneratecolumns = false in both form load , event , works.


Comments

Post a Comment

Popular posts from this blog

jquery - How can I dynamically add a browser tab? -

since using iframes house external pages are, accounts "not preferred method" , disallowed sites (flickr, one), want dynamically generate browser tabs. e.g., when user submits form, want dynamically generate tab on browser in response submitted. e.g., might want add new tab url like: http://www.bigsurgarrapata.com/contact how in jquery? you want form target attribute action attribute. http://www.w3schools.com/tags/att_form_target.asp browsers have ultimate control on result of target attribute open new tab value of _blank. <form action="contact_submit.php" target="_blank" method="post">
Read more

node.js - Getting the socket id,user id pair of a logged in user(s) -

i have web application done using node js , in it,i have authentication system requires users log in before can access pages. have 2 pages,the homepage , updates page. from read docs,a new socket id issued when user opens tab in browser. me being admin,i know socket id of logged in user , more so,the socket id,logged in user id pair logged in users. what method can use socket id,logged in user id pair make sure broadcast realtime info users online?.
Read more

keyboard - C++ GetAsyncKeyState alternative -

i using windows.h library's getasynckeystate function define key pushed on keyboard . here program returns int value of pushed key example. #include <iostream> #include <windows.h> using namespace std; int main (){ char i; for(i=8;i<190;i++){ if(getasynckeystate(i)== -32767){ cout<<int (i)<<endl; } } return 0; } but trying make opengl simple game , function appeared slow . there function not need cycle 180 times , if statement . thanks you're trying make opengl game, you're going use glfw. if that's case can away using glfwgetkey() such: if (glfwgetkey(glfw_key_up) == glfw_press) {...} if (glfwgetkey(glfw_key_down) == glfw_press) {...} that method nicely explained in tutorial 6 opengl-tutorial.org . should start first tutorial of beginners tutorials , later intermediate tutorials . if you're going make win32 window can listen wm_keydown or wm_keyup messages , virtua
Read more