c# - I get an error when I want to use EDM Codes in my Windows forms -


i wanted try code program wanted use edm in codes , in visual studio. coded (even save button , etc) there problem whenever want delete record database (which on computer in sql server 2014), error , program crashes , don't know why. can tell me can solve problem? in advance helpful answers.

here code:

 private void btnupdate_click(object sender, eventargs e)  {         if (txtcode.text == "")         {             messagebox.show("code morede nazar ra vared konid");             txtcode.focus();             return;         }          tblfastfood1 w1 = fa.tblfastfood1.firstordefault(x => x.code == convert.toint32(txtcode.text));          if (w1 == null)         {             messagebox.show("chenin codi mojod nist");             txtcode.focus();             return;         }          w1.esm = txtesmmoshtari.text;         w1.address = txtaddress.text;         w1.ghazaasli = combobox1.text;         w1.noshidani = combobox2.text;         w1.salad = combobox3.text;          fa.savechanges();          datagridview1.datasource = fa.tblfastfood1.tolist();     }

here error get:

linq entities not recognize method 'int32 toint32(system.string)' method, , method cannot translated store expression

this can't translated sql, can't used in linq provider (probably linq entities):

convert.toint32(txtcode.text)

instead of using in expression directly, perform operation before linq expression , use resulting value (which can passed sql):

int code = convert.toint32(txtcode.text); tblfastfood1 w1 = fa.tblfastfood1.firstordefault(x => x.code == code);

Comments

Post a Comment

Popular posts from this blog

Is there a better way to structure post methods in Class Based Views -

i'm using class based views in django , never specify url in ajax calls , omit action parameter in form because know these requests go through post method of class based view. notice view - profile page make many requests depending on user updating on page - post method become convoluted , if/else mess example: def post(self, request, *args, **kwargs): # handle user changing available date if request.post.get('availabledate') != none: self.updateavailabledate(request) return jsonresponse({'result':'success'}) if request.post.get('newprojectname') != none: creative_user = creativeuserprofile.objects.get(id = request.user.id) project = project.create_project(creative_user, request.post['newprojectname']) project.save() return jsonresponse({'projectid': project.id }) if request.post.get('projectimage') != none , request.files['file']: proj...
Read more

php - Cannot override Laravel Spark authentication with own implementation -

during login process of laravel spark need request token of remote api. api stores exact same users , passwords laravel spark application. therefore need username , non hashed password of user during authentication process. i thought overriding authenticated method solution problem. in routes/web.php override post /login endpoint , pointing endpoint own logincontroller: <?php namespace app\http\controllers\auth; use illuminate\support\facades\log; use illuminate\http\request; use laravel\spark\http\controllers\auth\logincontroller sparklogincontroller; class logincontroller extends sparklogincontroller { /** * create new login controller instance. * * @return void */ public function __construct() { parent::__construct(); } /** * handle successful authentication attempt. * * @param request $request * @param \illuminate\contracts\auth\authenticatable $user * @return response */ public fu...
Read more

What is happening when Matlab is starting a "parallel pool"? -

running parallel cpu processes in matlab starts command parpool() according documentation , function: [creates] special job on pool of workers, , [connects] matlab client parallel pool. this function takes bit of time execute, on order of 30 seconds. in other multi-cpu paradigms openmp, parallel execution seems totally transparent -- i've never noticed behavior analogous matlab (granted i'm not experienced parallel programming). so, happening between time parpool() called , when finishes executing? takes long? parallel computing toolbox enables run matlab code in parallel using several different paradigms (e.g. jobs , tasks, parfor , spmd , parfeval , batch processing), , run either locally (parallelised across cores in local machine) or remotely (parallelised across machines in cluster - either 1 own, or 1 in cloud). in of these cases, code run on matlab workers , copies of matlab without interactive desktop. if you're intending run on remo...
Read more