vb.net - Want to create function validating textbox with letters only -

-

and function validate specific format " ad12-xyx- 123-efd-20"

i have created function numbers only' want similar this

private sub allownumericonly(byval ctrl control)     if not isnumeric(ctrl.text) , ctrl.test<> ""         msgbox("please enter numbers only." , vbinformation)        ctrl.text = ""        ctrl.focus()      end if  end sub

please help!

here's method detect letters there far more problem that.

private function isallalpha(text string) boolean     return text.all(function(ch) char.isletter(ch)) end function

notice have written function rather sub. original method poorly written. should doing handling validating event of control, validating control contents in event handler , setting e.cancel true if fails, in case control retain focus. validation can done in place or method takes in string , returns boolean. example:

private sub textbox1_validating(sender object, e system.componentmodel.canceleventargs) handles textbox1.validating     e.cancel = not validatetextbox(textbox1, addressof isallalphaorspace, "please enter letters or spaces.") end sub  private sub textbox2_validating(sender object, e system.componentmodel.canceleventargs) handles textbox2.validating     e.cancel = not validatetextbox(textbox2, addressof isallnumeric, "please enter numeric digits.") end sub  private function validatetextbox(textbox textbox, validator func(of string, boolean), errormessage string) boolean     dim isvalid = validator(textbox.text)      if not isvalid         textbox.selectall()         textbox.hideselection = false          messagebox.show(errormessage, "invalid input", messageboxbuttons.ok, messageboxicon.error)          textbox.hideselection = true     end if      return isvalid end function  private function isallalphaorspace(text string) boolean     return text.all(function(ch) char.isletter(ch) orelse ch = " "c) end function  private function isallnumeric(text string) boolean     return text.all(function(ch) char.isdigit(ch)) end function  private function isallalphanumeric(text string) boolean     return text.all(function(ch) char.isletterordigit(ch)) end function

if want validate complex format indicated might consider using maskedtextbox or else use regex. i'm not of expert in finding out how should easy letters , digits.


Comments

Post a Comment

Popular posts from this blog

python - How to create jsonb index using GIN on SQLAlchemy? -

-
here's current code creating index jsonb. index("mytable_data_idx_id_key", mytable.data['id'].astext, postgresql_using='gin') but got error. sqlalchemy.exc.programmingerror: (psycopg2.programmingerror) data type text has no default operator class access method "gin" hint: must specify operator class index or define default operator class data type. [sql: "create index event_data_idx_id_key on event using gin ((data ->> 'id'))"] is there way create index on sqlalchemy? the postgresql specific sqlalchemy docs @ http://docs.sqlalchemy.org/en/latest/dialects/postgresql.html#operator-classes mention postgresql_ops dictionary provide "operator class" used postgresql, , provide example illustrating use: index('my_index', my_table.c.id, my_table.c.data, postgresql_ops={ 'data': 'text_pattern_ops', ...
Read more

PHP DOM loadHTML() method unusual warning -

-
i had following code works fine on localhost: $document = new domdocument(); $document->loadhtml($p_result); $form = $document->getelementsbytagname('form')->item(0); // code continues using $form variable after same code updated on outside server, loadhtml() failed , issued warning. warning: domdocument::loadhtml() expects parameter 1 valid path, string given in path/name/to/script.php returned null instead of object code pretty gets fatal error. note contents of $p_result absolutely same on outside server , on localhost. but why displays kind of warning , why not work? doesn't loadhtml() expects argument 1 string in first place? why method expects parameter 1 valid path ? just make clear i'm not calling loadhtmlfile() , i'm calling loadhtml() . thanks. you're affected one of php bugs . issue present in php 5.6.8 , 5.6.9. have affected php version on server, , bug-free version on localhost. the bug forbids null ...
Read more

c# - TransactionScope not rolling back although no complete() is called -

-
i'm using transactionscope rollback transaction fail bool errorreported = false; action<importerrorlog> newerrorcallback = e => { errorreported = true; errorcallback(e); }; using (var transaction = new transactionscope()) { foreach (importtaskdefinition task in taskdefinition) { loader.load(streamfile, newerrorcallback, task.destinationtable, processingtaskid); } if (!errorreported) transaction.complete(); } i'm sure there no transactionscope started ahead or after code. i'm using entity framework insert in db. regardless state of errorreported transaction never rolled in case of error. what missing ? transactionscope sets transaction.current . that's does. wants transacted must @ property. i believe ef each time connection opened reason. probably, connection open when scope installed. open connection inside of scope or enlist manually. ef has nasty "design decision": default opens ...
Read more