CSharp. Microsoft. Microsoft.NET Framework Windows-based Client Development is in development (Csharp)

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1 Microsoft CSharp Microsoft.NET Framework Windows-based Client Development is in development (Csharp) Download Full Version :

2 QUESTION: 68 You want to execute an event handler asynchronously from a Windows Form.You need to write code that uses the BackgroundWorker component named bgwexecute to execute the WorkHandler method. Which code segment should you use? A. E v e nt H a n d l e r w o r k = ne w E v e nt H a n d l e r ( Wo r k H a n d l e r ) ; bg w E x ec u t e. R u nwo r k e r As yn c ( wo r k ) ; B. ThreadStart tsbackground = new ThreadStart(WorkHandler); bgwe xecut e.repo rtpro gress(1 00, t sbackgro und); C. ThreadStart tsbackground = new ThreadStart(WorkHandler); bgwe xecut e.ru nwo rk erasync(t sbackgro und); D. bgwexecute.dowork += new DoWorkEventHandler(WorkHandler); bgwexecute.runwor kerasync(); Answer: D QUESTION: 69 You are cutomizing a Windows Form. The form includes a menu that has several ToolStripMenuItem controls. An event handler is configured to handle the Click event f o r a l l ToolStripMenuItem controls. T h e e v e n t h a n d l e r h a s t h e f o l l o w i n g s i g n a t u r e. private void menu_click(object sender, EventArgs e) The form class includes a method that has the following signature. private void LogClick(string ctlname) You need to add code so that when a user clicks a ToolStripMenuItem control, the menu_click method calls the LogClick method. The LogClick method must be called with the ctlname parameter set to the menu text in the ToolStripMenuItem control. Which code segment should you use? A. T o o ls t r ip M e nu I t e m mn u I t e m = ( To o ls t r ip M e nu I t e m) se nd er ; LogClick(mnuItem.Text); B. LogClick(e.ToString()); C. LogClick(this.Text); D. ToolStripMenuItem mnuitem = (ToolStripMenuItem) this.getcontainercontrol(); LogClick(mnuItem.Text); Answer: A QUESTION: 70 You are creating a Windows Form that includes a TextBox control named txtdate.when a user right click within the text box, you want the application to display a 34

3 MonthCalendar control.you need to implement a context menu that provides this functionality.what should you do? A. Add the following code to the form initialization. MonthCalendar cal = new MonthCalendar(); ContextMenuStrip mnucontext = new ContextMenuStrip(); ToolStripControlHost host = new ToolStripControlHost(mnuContext); txtdate.contextmenustrip = mnucontext; B. Add the following code to the form initialization. ContextMenuStrip mnucontext = new ContextMenuStrip(); MonthCalendar cal = new MonthCalendar(); ToolStripControlHost host = new ToolStripControlHost(cal); mnucontext.items.add(host); txtdate.contextmenustrip = mnucontext; C. Add the following code to the form initialization. ToolStripContainer ctr = new ToolStripContainer(); MonthCalendar cal = new MonthCalendar(); ctr.contentpanle.controls.add(cal); txtdate.controls.add(ctr); Add a MouseClick event handler for the TextBox control that contains the following code. if (e.button == MouseButton.Right) { txtdate.controls[0].show(); D. Add a MouseClick event handler for the TextBox control that contains the following code. if (e.button == MouseButtons.Right) { ContextMenuStrip mnucontext = new ContextMenuStrip(); MonthCalendar cal = new MonthCalendar(); ToolStripControlHost host = new Answer: B QUESTION: 71 You are creating a Windows Forms application. The application uses a SqlCommand object named cmd. The cmd object executes the following stored procedure. CREATE PROCEDURE GetPhoneList AS BEGIN SELECT CompnayName, Phone FROM Customers SELECT CompanyName, Phone FROM Suppliers END You need to add all returned rows to the ListBox control named lstphones. Which code segment chould you use? A. S q ld a t a Re a de r r d r = c md. E x e c u t e R ea d er ( ) ; 35

4 do { while (rdr.read()) { lstphones.items.add(rdr.getstring(0) + "\t" + rdr.getstring(1)); while (rdr.nextresult()); B. SqlDataReader rdr = cmdexecutereader(); while (rdr.read()) { lstphones.items.add(rdr.getstring(0) + "\t" + rdr.getstring(1)); C. SqlDataReader rdr = cmdexecutereader(); while (rdr.nextresult()) { while (rdr.read()) { lstphones.items.add(rdr.getstring(0) + "\t" + rdr.getstring(1)); D. SqlDataReader rdr = cmdexecutereader(); while (rdr.nextresult()) { lstphones.items.add(rdr.getstring(0) + "\t" + rdr.getstring(1)); Answer: A QUESTION: 72 A Windows Forms application reads the following XML file. <?xml version="1.0"?> <x:catalog xmlns:x="urn:books"> <book id="bk101"> <author>gambardella, Matthew</author> <title>xml Developer's Guide</title> </book> <book id="bk102"> <author>ralis, Kim</author> <title>midnight Rain</title> </book> </x:catalog> The form initialization loads this file into an XmlDocument object named docbooks.you ne ed t o po p u la t e a L is t B o x c o nt ro l n a me d l st B oo k s w it h t he c o nc at e na t e d bo o k I D a nd title of each book. Which code segment should you use? 36

5 A. X m ln o d e L ist e le me nt s = d o c Bo o k s. G et E le me nt sb yt a g N a me ( " bo o k ") ; f o r e a c h ( X m l E l e m e n t n o d e in elements) { string s = node.getattribute("id") + "-"; s += node.selectsinglenode("title").innertext; lstbooks.it ems.add(s); B. XmlNodeList elements = docbooks.getelementsbytagname("book"); f o r e a c h ( X m l E l e m e n t n o d e in elements) { string s = node.selectsinglenode("id") + " - "; s += node.getattribute("title"); lstbooks.it ems.add(s); C. XmlNodeList elements = docbooks.getelementsbytagname("book"); f o r e a c h ( X m l E l e m e n t n o d e in elements) { string s = node.getattribute("id") + "-"; s += node.selectsinglenode("title").value; lstbooks.it ems.add(s); D. XmlNodeList elements = docbooks.getelementbytagname("book"); f o r e a c h ( X m l E l e m e n t n o d e in elements) { lst Books.It ems. Add(node.InnerXml) ; Answer: A QUESTION: 73 A Windows Forms application contains the following code segment. tring SQL EmployeeID, LastName, FirstName, FROM Emloyees"; SqlDataAdapter da = new SqlDataAdapter(SQL, connstr); DataTable dt = new DataTable(); da.missingschemaaction = MissingSchemaAction.AddWithKey; SqlCommandBuilder bld = new SqlCommandBuilder(da); da.fill(dt); The application allows the user to add rows to the data table. The application will propagate these additions to the database. If the addition of any row fails, the other rows must st ill be added. The code must lo g ho w ma ny new ro ws to be added.yo u need to propagate the additions to the database and log a failed count. Which code segment should you use? A. d a. C o nt inu e U p d a t e E r r o r = t r u e ; da.update(dt); DataTable dterrors = dt.getchanges(datarowstate.unchanged); Trace.WriteLine(dtErrors.Rows.Count.ToString() + 37

6 " rows not added."); B. da.continueupdateonerror = false; da.update(dt); DataTable dterrors = dt.getchanges(datarowstate.unchanged); Trace.WriteLine(dtErrors.Rows.Count.ToString() + " rows not added."); C. da.continueupdateonerror = true; da.update(dt); DataRow[] rows = dt.geterrors(); Trace.WriteLine(rows.Length.ToString() + " rows not added."); D. da.continueupdateonerror = false; da.update(dt); DataRow[] rows = dt.geterrors(); Trace.WriteLine(rows.Length.ToString() + " rows not added."); Answer: C QUESTION: 74 You are customizing a Windows Form to asynchronously update a database.you need to ensure that the form display a message box to the user that indicates the success or failure of the update. Which three code segment should you use? (Each correct answer presents part of the solution. Choose three.) A. private void StartBackGroundProcess( ) { bgwexecute.dowork += new DoWorkEventHandler(WorkHandler); bgwexecute.runwor kercomplet ed += ne w R u n Wo r k e r Co mp l et e d E ve nt H a n d le r ( Co mp l e t e d H and le r ) ; bgwexecute.runworkerasync(); B. private void StartBackgroundProcess() { bg w E xe c u t e. P ro c es sc ha n g e d + = new ProgressChangedEventHandler(CompletedHandler); ThreadStart tsbackground = new ThreadStart(WorkHandler); bgwexecute.runworkerasync(tsbackground); C. private void StartBackgroundProcess() { bgwexecute.runwor kercomplet ed += ne w R u n Wo r k e r Co mp l et e d E ve nt H a n d le r ( Co mp l e t e d H and le r ) ; ThreadStart tsbackground = new ThreadStart(WorkHandler); bgwexecute.runworkerasync(tsbackground); D. void WorkHandler(object sender, DoWorkEventArgs e) { //... 38

7 E. Result = true; F. void WorkHandler(object sender, DoWorkEventsArgs e) { //... bgwexecute.reportprogress(100, true); G. void CompletedHandler(object sender, RunWorkerCompletedEventArgs e) { bo o l r esu lt = ( bo o l) e. Re su lt ; MessageBox.Show("Update " + (result? "was successful" : "failed")); H. void ProgressHandler(object sender, ProgressChangeEventArgs e) { bo o l r e su lt = ( bo o l) e. Use r S t at e ; MessageBox.Show("Update " + (result? "was successful" : "failed")); Answer: A,D,G QUESTION: 75 You are customizing a Windows Form to update a database asynchronously by using an inst ance o f a BackgroundWor ker component named bgwexecute.you st art t he component by using the following code. private void StartBackgroundProcess() { bgwexecute.dowork += new DoWorkEventHandler(WorkHandler); bgwexecute.doworkercomplet ed += ne w D o Wo r k e r Co mp l et e d E ve nt H a nd l er ( C o mp l et e d Ha nd l er ) ; bgwexecute.progresschanged += new ProgressChangedEventHandler(ProgressChanged); bgwexecute.runwor kerasync(); If the UpdateDB method that is called by the BackgroundWorker component returns the va l ue Fa l se, yo u need t o display a message box to t he use r t ha t ind ic at es th at the u pdat e failed.which code segment should you use? A. void WorkHandler ( object sender, D o Wo r k E v e nt Ar g s e ) { if (!UpdateDB()) MessageBox.Show("Update failed"); B. void CompletedHandler(object sender, RunWorkerCompletedEventArgs e) { if (!UpdateDB()) MessageBox.Show("Update failed"); C. void WorkHandler(object sender, DoWorkEventArgs e) { D. Result = UpdateDB(); 39

8 vo id Co mplet edhandler(o bject sender, RunWor kercomplet edeventargs e) { if (!(boo l) e.result ) MessageBox.Show("Update failed"); E. void WorkHandler(object sender, DoWorkEventArgs e) { F. Result = UpdateDB(); vo id Co mplet edhandler(o bject sender, RunWor kercomplet edeventargs e) { Answer: C QUESTION: 76 You create an application that provide accessibility features.your standard forms display a background image. When the user selects.use High Constrast in the Accessibility Options in Control Panel, you want this image to be removed.you need to add an event to ha nd l e t h is a cc e ss ib i l it y s et t ing c ha ng e. W hic h e ve nt sho u ld yo u u se? A. t his.s t ylec ha nged B. SystemEvents.UserPreferenceChanged C. this.changeuicues D. SystemEvents.DisplaySettingsChanged Answer: B QUESTION: 77 You are creating a Windows Forms application.you add an ErrorProvider component na me d e r pe r ro r s a nd a D at e T ime P ic ke r c o nt r o l na me d d t p St a rt D at e t o t h e a p p lic a t io n. The application also contains other controls. You need to configure the application to display an error notification icon next to dtpstartdate when the user enters a date that is greater than today's date.which two action should you perform? (Each correct answer presents part of the solution. Choose two.) A. Ans For the Validating event of dtpstartdate, create an event handler named VerifyStartDate. B. For the Validated event of dtpstartdate, create an event handler named VerifyStartDate. C. In the Properties Window for dtpstartdate, set the value of Error on erperrors to Date out of range. D. In VerifyStartDate, call erperrors.seterror(dtpstartdate, "Date out of range") if the va lu e o f dt p St a rt D at e va lu e is g r e at e r t ha n to d a y 's d at e. 40

9 E. Ans In VerifyStartDate, call erperrors.seterror(dtpstartdate, null) if the dtpstartdate.value is greater than today's date. Answer: Pending. Please send your suggestions to 41

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