Forms :: Which Statement Has NO Effect

Nov 1, 2006

I was recently asked a multiple choice question: According to the sample code, which one of the following statements has NO effect and should be moved to another line to accomplish its purpose?

dim tb as New TextBox
g_row as Integer = 0
tb.Text = CType(g_row, String)

[code]....

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.net - C# - Code Contracts - Detected Expression Statement Evaluated For Potential Side-effect?

Jan 20, 2012

I have a class with a static list of keys, and I have a static method called Remove() that removes a key from that list.Now what I understand from the contracts post conditions is that as the programmer of the class, I guarantee that the current public method does something specific, in this case : removing the element of the list.

Here's what I've written:

private static List<Keys> m_usedKeys; // private list of keys
public static void Remove(Keys _key)
{

[code]....

What I'm trying to "Ensure" here, is that the Remove() method removes the key for real from the list (Yes this might be a trivial example, but I get the error there.)when I write the Contract.Ensures() line, VS2010 gives me the following error :

Error 3 Detected expression statement evaluated for potential side-effect in contracts of method 'LibJungleTimer.KeyBind.Remove(System.Windows.Forms.Keys)'. (Did you mean to put the expression into a Requires, Ensures, or Invariant call?) C:UsersJoelDocumentsProgrammationJTJungleTimerLibJungleTimerKeyBind.cs 51

I think this error says that the expression m_usedKeys.remove(_key); has a potential side-effect. In fact, it has a side-effect, it removes a key from the list!If I try to write something like this instead :

Contract.Assert(!m_usedKeys.Any(x => x == _key));

well it compiles fine.

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.net - AeroGlass - Add Glass Effect To A Win Forms?

Mar 14, 2012

how to add glass effect to a win forms in vb.net or c# I looked a lot of examples like using e.graphics to make a square with the win form dimension and others are done really good without any e.graphics trick. But my problem is that I didn't look any example that uses windows controls like buttons, labels, dropdowns, etc on a glass effect win form.

[Code]...

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Enabled The Glass Effect To Windows Forms?

Aug 22, 2011

I have enabled the glass effect to Windows Forms in Visual Basic 2010. When I drop controls, they are not displaying well as usual. Whats is wrong with this?Image:

Texts are displaying only front of Black color.

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Base Form And Inherited Other Forms From It - Don't See Those Changes Take Effect In My Inherited Forms?

Jun 24, 2010

I have a base form and I inherit other forms from it. However, if i go back and change say the size of the base form, I don't see those changes take effect in my inherited forms. Does anyone know why that is? Is there a solution to this issue?So as far as design is goes, what exactly gets inherited by other forms?

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Forms :: Producing The "slide" Effect?

Feb 27, 2010

I am trying to produce the effect of a projector screen (side on) sliding downwards and want to achieve this by the screen (narrow rectangle) changing its height, waiting, changing its height again so it looks like its sliding.I have formed this code for the button but for the life of my cannot work out why it won't work. I am using Visual Studio 2008.

Dim Sleep As Integer = 500
Threading.Thread.Sleep(Sleep)
RectangleShape1.Height = 60

[code].....

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Forms :: Managing Multiple Conditions In IF - Then Statement

Oct 19, 2010

I currently have an If...Then statement that checks if all fields of a form have been filled before saving the info in a file. I'd like to be able to tell which field has not been filled to give the user a dynamic message (at the moment, it only tells them that the checklist is not completed ) :

If (txtNoDemande.TextLength = 8 _
Or txtNoDemande.TextLength = 13 _
And txtDateLoad.TextLength <> 0 _

[CODE]...

Is there a way to determine which of these conditions is false without having to do a seperate If statement for each ?

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Forms :: Use Inputted Data From The NumericUpDown Control In A Statement?

May 13, 2009

I have a NumericUpDown control with a range of 10-50 and I want to have the selected number be multiplied by an amount of money to create yearly cost. I dont know, however, how to use inputted data from the NumericUpDown control in a statement because I cannot convert it to Integer and I also dont know how to call in the data even if a number is selected.

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Forms :: PointToScreen - Co-ordinates For The Labels In One Statement Without Adding The X And Y Co-ordinates Of The Panels

Nov 2, 2008

Apparently I don't understand what PointToScreen() is actually returning. I'm thinking it should be absolute screen co-ordinates. In a form, I have some labels in a panel, which itself is in a panel and am trying to derive the screen co-ordinates for the labels in one statement without adding the X and Y co-ordinates of the panels. Why does PointToScreen(Label.Location) return the same value as PointToClient(Label.Location) and the same as Label.Location? Shouldn't PointToScreen() return absolute SCREEN co-odinates?

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SQL Statement Doesn't Work - INSERT Statement Works Fine In The Form Load But Not In The Button Click Event?

Oct 14, 2009

See

Public Class Form1
Dim sql As String
Dim conn As New OleDb.OleDbConnection
Dim da As New OleDb.OleDbDataAdapter

[CODE]...

The problem, The INSERT statement works fine in the form load but not in the button click event?

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Forms :: Use A If Statement To See If Fosters Button And Number 1 On The Number Pad Are Both Pressed Then Multiply Constant By Quantity Number?

Mar 4, 2011

I am doing a bar cash register and I want to use a if statement to see if fosters button and number 1 on the number pad are both pressed then multiply constant by quantity number

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If <expression> Then <statement [:statement]> Else [statements] In Concrete Form?

Jan 1, 2010

I was convinced that If <expression> Then <statement [:statement]> Else [statements] in concrete form of If a = b Then SayHello() Else SayBye() End has sense. I read article on msdn on If-then-else, but I forgot why I was reading, so I concluded, that snippet above means this

If a = b Then HelloIsSaid : IsNotEnded Else ByeIsSaid : IsEnded But I have tested it now, and I see, that Else without statement is nothing more than decoration. It would be pretty good if it had function I described. Do you think its good request? Or do you know any circumstance where this Else has some function?

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Making A Next Statement Into A Loop Statement In Visual Basic?

Jun 8, 2009

y friend and I are re-learning Visual Basic, and we are stumped on this bit of code.

For intAsterisks As Integer = 0 To intLine - 1
lblAsterisks.Text = lblAsterisks.Text + "*"
Next

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Sql - Perform An Inline Select Statement In A LINQ Statement?

Jun 24, 2011

I have the following SQL:

[Code]...

I want to put it (the select count statement) in this LINQ statement so I can get the sales count in my linq statement: Dim TheLeads = (From L In DB.Leads Where L.IsDeleted = False Select L).ToList() Is this possible to do in LINQ?

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Changes Won't Take Effect?

Aug 22, 2011

Wrote a custom stand alone engineering program to do some very basic repetative design calculations. This program also does pricing by taking each design element and asigning pricing to it based on the parameters given. All the individual elements are added together to get a unit cost. (All this works well without any problems or issues)

[Code]...

My eventual goal once I can prove that my changes work is to control the pricing by using the YEAR so that the program increases the cost by a set multiplier based on the actual YEAR the system is set for. ie: 2011
10% increase, 2012 5% increase, 2013 5% increase, etc.

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VS 2005 Changes Does Not Take Effect?

Aug 15, 2009

I have fields with " monday, tuesday,wed, thu, fri, sat and sun". I am trying to add the hours of each day on a separte field " week total hours "..Everything works fine but say if i make any changes again to "monday hours" it does not take effect on " tot hours "

eg.. mon 2hrs, tues 1 hrs, wed 1 hrs, thur 0, fri o, sat 0 and sun 0, then the total hours is 2+1+1 = 4 and it displays well ....but if i change ( mon= 1 ) then it should be 1+1+1 = 3 but it remains 4

[Code]...

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Change The Exit Statement To A Continue Statement?

Feb 23, 2009

add an if statement and an exit statement to my do loop that exits when my future value (FV) is greater than 1000, then to change the exit statement to a continue statement so my loop will continue even though my fv is greater then 1000, point is to get this to run even though my if statement doesnt do anything. problem something wrong in my code and an exception error (xception of type 'System.OverflowException' occurred in mscorlib.dll)

so can someone show me where or why I have an error is, what am I overthinking now! I could use a hint, OMG i could use a tutor for that matter

[Code]...

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ElseIf Statement Into A Select Case Statement?

Jun 23, 2010

A co-worker wants to convert the following IfThenElseIf statement into a Select Case statement.
Explain why this is not possible.

If temperature = 100 Then
X = 0
ElseIf population > 1000 Then
X = 1
ElseIf rate < .1 Then
X = -1
End If

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SQL Statement :: Nearly Working Just Cant Get Form Values In Statement?

Aug 4, 2010

I cant get this SQL statement to insert any of the values in the form to add to the database

sql
sql = "INSERT INTO prevresults (ExamDate, ExamTime, CorrectAnswers, PassPercentage) VALUES (date.now, time.now, rightanswers, percentage.text)"

[code]....

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Add Wait Form Effect?

Jun 30, 2010

I want to add a wait process form instead of the wait cursor effect while the method block execute codes.[code]...

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Create A Spinning Effect?

Feb 23, 2010

I have to create a slot machine. i have 3 picture boxes and i need to know how the program can randomly select from the 7 pictures i have but still create a short delay where there is the effect of spinning. my teacher said that it would be easy to assign each picture a number but i didnt get what he means.

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Effect Of Openform On Subforms?

Jun 12, 2009

When I use a control button on a switchboard to open my form which has subforms, the subforms open in datasheet view. When I open the form directly the subforms open in single form/continuous form view - which is what I want. Is there something I can do to the event procedure to make the subforms open properly?

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Glow Effect To Mouse Over?

Dec 22, 2009

I am not an advanced VB programmer as I create applications for fun at home, so am hoping someone can help me with this. I would like to add a mouse over glow type effect to a control (doing this on a picturebox at the moment). I did this very simplistically by creating a user control and having a picturebox within a picturebox, one of which is not visible. On the mouse over, I just make it visible and it does look cool as it has rounded edges and all that. But I assume this is not a good technique and really limits you. I would like to do it so I can define the color, glow size, etc... kind of like the glow effect in Flex.

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IDE :: Why Click On A Button Twice To Take Effect

May 5, 2010

I have a few routines that they loop forever if they are not interrupted.Selecting any of them sets the "seq" to True.This would leave them in the tight loop to do whatever they do.Its different patterns of LED flashing.I use another button to stop and that makes the "seq" go False.Interesting that I need to click the stop twice to take effect.I can click the stop now and the 2nd click could be after a long time but there is always the 2nd click on Stop that takes effect.

[code]....

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New WebBrowser1 Won't Be Effect With WebBrowser1_DocumentCompleted

Jan 20, 2011

I use to remove wb1 at some point after work Is done

WebBrowser1.Dispose()
and
Dim WebBrowser1 As New WebBrowser
Controls.Add(WebBrowser1)
WebBrowser1.BringToFront()

[code]....

p.s the reason I'm doing it because even if you delete cookies, index.dat will have cookies saved for the current wb1 and won't be deleted only if you reopen the app.

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PageSetup.FirstPageTray Not Having Any Effect?

Mar 11, 2009

I am try to control which tray to print to from a VB form. (VS2008)The target printer is HP laserjet 4200 with a 4 tray TowerTray added. The test is below just cycles through the 16 options, but they all go the botton tray on the printer. The default tray is the top tray on the printer.Imports Word = Microsoft.Office.Interop.WordImports System.Drawing.Printing

Public Class PrintTest1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click testprint() End Sub
Private Sub testprint() Dim oWord As Word.Application Dim oDoc As Word.Document = Nothing

[Code]...

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Picturebox Fade Effect?

Dec 20, 2011

i am making a marriage bureau desktop application software and i have set 12 pictureboxes in a groupbox...i have set timer to change picturebox in groupbox but this does not feels impressive so now i am trying to give fade effect to these pictureboxes i tried a lot but not succeeded...

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Position - GROWL Effect In .net App?

Mar 14, 2012

i came up with the following code to produce a "GROWL" like effect that you see on MAC's and some jquery websites. (example of something like this can be found HERE. The code i am using works great and displays the message(s) just fine. However, the problem i am having a hard time trying to get working is how to display the current message ABOVE each previous message thats still on screen and having a timer for EACH message that pops up. Currently it closes all the message boxes at the same time.

The code is this:

Public Class Growl
Private _notifications As New Dictionary(Of Integer, msgWindow)
Private _count As Integer = 0

[code].....

Right now it will display the newest post BELOW the old post. What do i need to change in order for it to display the newest one top and keep working its way down the list as other message boxes appear?

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Set Picturebox As Glass Effect?

Mar 30, 2010

I would like to know if it possible to create an effect of magnifying glass for the picturebox, so I could see the other controls behind the picturebox which make them looks like a glass?

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Sql - SQLCE Query Having No Effect?

Aug 28, 2011

I'm attempting to insert rows into an SQLCE database, and it's returning that 1 row is affected, there's no exception, and no syntax error in the query as far as I can see - but it's having no effect, when I look in the table from the Database Explorer.

Here's the code, though it probably doesn't make a difference:

Using conn As New SqlCeConnection(My.Settings.DietSafetyCheckerReportsConnectionString)
conn.Open()
Using cmd As SqlCeCommand = conn.CreateCommand()

[code]....

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