Forms :: Avoiding Clashing Functions?

Jul 26, 2010

This particular function is used to save the returned results for a ping sent across the internet. Unfortunately the code won't let me Use the streamwriter method or the fileopen method, because it says:"The process cannot access the file 'C:UsersChrisDocumentsPinging DataFilesave2.txt' because it is being used by another process."

Private Sub SaveToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles SaveToolStripMenuItem.Click
FileOpen(1, "C:UsersChrisDocumentsPinging Datacount.txt", OpenMode.Input, OpenAccess.Read)

[code].....

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VS 2008 : Have A Class Where The Functions Of The Same Name Are Both Instance Functions And Shared Functions?

Dec 6, 2010

What I am trying to do is have a class where the functions of the same name are both instance functions and shared functions.

Public Shared Function Get...(byval xx as xx)

and

Public Function Get...

The Public Function uses a Property xx created in the constructor, whereas the Shared Function has the parameters (byval xx as xx).

Calling Functions From One Class To Another And Using Multiple Forms?

Nov 21, 2009

The project requires a form that has textboxes for a students name and the amount of books they have read, and a label where the points they have earned for their reading is displayed. Also a seperate form with About information and yet another seperate form for summary information.

Forms :: Functions Work Only If Form Is Run Directly (non-MDI)?

Dec 14, 2010

I have this weird issue:I developed an application with a sequence like this login form -> mainform (=mdi parent) --> some functionform (mdi-child)--> report form

The reportform contains a reportviewer and will display different dataset queries depending on the state of some radio buttons which are located on the previous form ('some function form'). When I run the project directly from the 'some function form' (set startup form for project) things work great. The report shows the correct data depending on choices made on the previous form.But....when I run the project all the way from login and mainform it doesn't work. Seems like the choices made on the "some function form' are not coming through to the report form.

Forms :: Adding Preset Option To Functions / Methods

Jul 20, 2009

I'm trying to create classes, functions, etc that present a preset list of options to users (in the same way that messagebox control will show the available button options). A simple example is readFile(ByVal strPath as string, ByVal strFileType as string) where the user will see a list of acceptable file types when they put the comma after strPath.

Forms :: Random Functions - When Start Program And Click Picturebox - Same Card Will Always Come Visible

Mar 30, 2011

Okay, so I'm doing a card game and I'm trying to set that when picturebox (PictureBox1) is clicked, a random card from 13 cards will come visible. Problem is, that when i start the program and click the picturebox, the same card will always come visible. As you can see i've put a button (Button1) which will hide every card. If I press Button2, then Button1 and then the PictureBox1 it will show differend card, but the cards which come visible are always the same.

e.g i press PictureBox1 (which will make card visible), then Button1 (which will make PictureBox1 non-enabled) and then Button2 (which will hide every card and make PictureBox1 pressable). Lets say i pressed the PictureBox1 four times and i got cards: 9, 6, 7, 3, then I close the program, start it again and press PictureBox1 again 4 times and it will show the same cards (9, 6, 7, 3). How can this be done that it will not show the same cards always?

Here's my code...
Public Class Form1

Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
End

[CODE]....

Excel Maths Functions And Calls To All DLL Functions Documentation?

Jan 29, 2007

1) Is it possible to access the Excel mathematical functions without actually opening Excel?

I was thinking of through a DLL WinAPI call or maybe a delegate function or smaller program?

2) Does anyone know of a MS link or area that gives instruction on "how to" use every function of every Windows DLL at all?

Or for all those that Microsoft have chosen to document online at least.

Avoiding ListView Duplicates

Jan 19, 2009

Im adding listviewitems and want to avoid duplication. Now currently, I have resorted to looping through the listview and comparing each items text property against what Im adding. But for a big table this is very slow. The ListView has a .Contains Method but this does not seem to do what I would have assumed; for example [code]Is there a way of doing this so I dont have to loop through all the items?

Avoiding Multiple IF Statements?

Sep 14, 2010

I have the following code block. I'm tired of typing the same IF statement to check if the string has any lenght before assignning them to the class properties of Employee.

Is there any better to accomplish this?
Dim title = txtTitle.Text.Trim
Dim firstName = txtFirstName.Text.Trim

[code].....

Generic DAL Avoiding Reflection?

Oct 13, 2010

I'm working on a new DAL for my latest project. As the performance is essential I'm avoiding late binding/reflection as much as possible. One central part is the DAL function for populating Business Objects.One class is called in order to connect to the database with the given SQL (stored procedures can't be used in this environment) and the given Business Object or List is populated. As different Business Object types will be populated by the same function I made an Interface that all of the Business Objects implements with the Sub called "Fill". The question is - will reflection be used in this scenario? My thought was as I'm "describing" the objects trought the interface the compiler doesn't need to use Reflection.

[Code]...

Avoiding 'Microsoft Excel' Prompt

Feb 15, 2012

I'm writing the following bits of code for a SaveFile Dialog box in Visual Basic 2010.NET. The code works well as the XLSX file is created and opens in Microsoft Excel. However, the problem that I am having is that if the program overwrites a file, the user is getting two prompts. One prompt is from the program's own SaveFile dialog confirming the choice. The other is from Microsoft Excel asking you the same. It's as if the program is running in the background.[code]

Avoiding Creation Of SQL Queries In DataSet

Sep 26, 2011

I want to avoid the creation of SQL queries inside the dataset. Here's the screenshot:

Dim search_by_dateofcanvass = sqlcomm.CommandText = "SELECT [#], Material_Name, Brand, Unit, Discount, Supplier, Category, Date_of_Canvass, City, ListPrice, Material_Description, NetPrice, Area FROM CanvassTable WHERE (Date_of_Canvass = " & DTPcanvass.Text & ")"
Me.CanvasstableTableAdapter.search_by_dateofcanvass(Me.FinalDatabaseDataSet.CanvassTable, datepick)

By the way that query can be use to search for date.

Avoiding Double Data In Datagridview?

Sep 16, 2011

If dr("iname").ToString = DataGridView1.item(0).cells.item(0).valueThen Then
MsgBox("Similar items are not allowed.", MsgBoxStyle.Critical)
Exit Sub
End If

I need to avoid displaying similar data from my mysql database table iname to the gridview, but I can't identify the right syntax/code for that?

Avoiding Duplicate Values In Database?

Jun 21, 2010

I want to insert number for City_Id and City_name , i wrote a query for auto generate number for City_Id,working fine but in the city name i want to avoid inserting duplicate value like if Mumbai is a City ihave already saved then system should not allow that name again. neither in small or in capital or mixed letter.

Avoiding Namespace Declaration In Each File?

Sep 25, 2009

One feature of C# compiler is that namespace declaration by default follows the folder name structure in the project. By e.g. you have MyProject1MyDrawing and inside you create a class MyPoint the namespace for MyPoint will be MyProject1.MyDrawing

In VB I cant see any namespace declaration(apparently it implicitly 'inherits' the project(MyProject1) namespace). If I create a MyPoint and MyLine clases in the MyDrawing folder I need to surround each of created classes with "Namespace MyProject1.MyDrawing"..."End Namespace".

Is it possible to automatically name the namespaces like in C# by the folder name?

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Avoiding Referential Integrity While Updating

Jul 4, 2009

I have an MS Access database and an MS Visual Basic 2008 front end.I get this error when trying to update a record that has related records:The record cannot be deleted or changed because table 'X' includes related records.I only want to update one field in the row in the 'parent' table which is not the primary key field of either record but the 'Update' command seems to want to rewrite the whole datarow. Rewriting the whole row causes the error (as this updates the primary key). If I switch off refrential integrity checking in the underlying database this solves the problem except that I want to maintain referential integrity so its not really a solution. I have tried beginEdit and EndEdit with no success - same error.Is there a way to update just one field in a row and write that back to the database?

Avoiding The Video Source Window?

May 17, 2012

I need the Logitech HD Webcam C310 to be preselected.When the Main Form opens the Webcam must be running allready, withoute having to select it from the Video Source Window.

Avoiding Updating A Form From A Thread?

Sep 8, 2009

I've seen a good bit written on avoiding updating a form from a thread.However,I was wondering if that was a problem if the thread exists in an object that programatically builds the form?Thus the form and associated logic exist within the same "thread space." Seems on the face of it like it would work since everything in the form should be in a single dispatch queue.

[2008] Avoiding The Requirement Of .net Framework?

Jan 31, 2009

i get a lots of errors with my application because users doesn't have the .Net Framework installed so i was thinking, can't i take every .net framework resource that my application uses and needs, and add it as a reference in my application so that the user does not need to install .Net Framework?

Avoiding Boxing / Unboxing On Unknown Input

Feb 25, 2011

I am creating an application that parses an XML and retrieves some data. Each xml node specifies the data (const), a recordset's column-name to get the data from (var), a subset of possible data values depending on some condition (enum) and others. It may also specify, alongside the data, the format in which the data must be shown to the user.

The thing is that for each node type I need to process the values differently and perform some actinons so, for each node, I need to store the return value in a temp variable in order to later format it... I know I could format it right there and return it but that would mean to repeat myself and I hate doing so. So, the question: How can I store the value to return, in a temp variable, while avoiding boxing/unboxing when the type is unknown and I can't use generics? P.S.: I'm designing the parser, the XML Schema and the view that will fill the recordset so changes to all are plausible.

[Code]...

.net - Avoiding Overlapped Bookings In Booking System Application?

Aug 22, 2011

If a booking is present in database on 12/27/2011 at 5:00 pm for 2 hours and i try to make a new booking on 12/27/2011 between 5 to 7 pm then my code generates an error message. Even if i try to book at 4:00 pm for 2 hours it generates an error message as the 2nd hour will be overlapped here with already made booking from 5:00 to 7:00.

Now here comes the problem part. When day changes it doesn't generate error message i.e. IF a booking is there on 12/27/2011 at 11:00 pm for 3 hours then it should not allow new booking till 12/28/2011 2:00 am but when i try to book 12/28/2011 at 1:00 am it saves it in the database and doesn't generate an error message. I want an error message generated in such a case.

I am using two separate fields in database one for time and one for date. Both of them have DateTime datatype.

newtime refers to time on which i'm trying to make new booking addednewtime refers to time after adding the duration to time on which i'm trying to make new booking

[Code]...

.net - Elapsed Time With Environment.TickCount() - Avoiding The Wrap

Apr 16, 2009

Does the absolute value protect the following code from the Environment.TickCount wrap?

[code...]

Avoiding Cross Process Calls When Doing Word Automation

Oct 5, 2010

I've got a Word Addin in VB.net and VSTO that exposes a COM compatible object via Word.COMAddins.Object, so that the addin functionality can be called External to Word, without accesses to Word itself being cross-process.The technique worked in VB6, but with VB.net, it still works, but it's much slower than the same code running directly from the addin via a task pane, as if the calls are all cross process when they shouldn't be.Anyone who's ever done Word automation knows that code that runs perfectly acceptably INPROC with Word (in this case the instance of the ADDIN that Word itself loads), will generally run unacceptably slowly out of process (or cross process).[code]And slow as in a factor of about 10 to 1; what takes 3 seconds to run when run directly from the ADDIN via the task pane, takes ~30seconds to run when called from external code through the COMADDIN.object object. I'm guessing that I'm running into some sort of issue with .net APPDOMAINS or something and what +really+ constitutes cross proc calls in .net, but I've found nothing so far that would even hint about this sort of thing.My next step, barring some mystical insight, will be to code up a repro, which could get tricky because of the shear number of elements in play.

Avoiding Exception Of Request QueryString If Parameter Not Passed?

May 2, 2012

If the parameter variable is not passed then this code throws an exception of "Conversion from string "" to type 'Date' is not valid."

This is my code.
Public Shared ReadOnly Property Request_projectStartDate() As Date
Get
Dim _value As String = Nothing
[Code] .....

Avoiding Loading Of Form When Experimenting With Debug.Write?

Jun 17, 2011

loading of form when I experiment with Debug.Write code?I deleted the form,placed code in a standard module before running the program but am getting an error message.With the form existing I get what I want but I just don't need to wait for the form to load and then to click cancel to close it.Is it not possible to have just a standard module in a VB 2010 Express project? If not can't I place the code in form1.vb but stop it from loading every time I test something?

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Avoiding Microsoft Excel Prompt - User Is Getting Two Prompts

Feb 7, 2012

I'm writing the following bits of code for a SaveFile Dialog box in Visual Basic 2010.NET. The code works well as the XLSX file is created and opens in Microsoft Excel. However, the problem that I am having is that if the program overwrites a file, the user is getting two prompts. One prompt is from the program's own SaveFile dialog confirming the choice. The other is from Microsoft Excel asking you the same. It's as if the program is running in the background. Does anyone know how I can write this code to save the file as an Excel file? [Code]

Avoiding Print Dialog When Printdialog() Called For .rdlc?

Mar 4, 2011

I am using Printdialog() to get my report printed (.rdlc)I want to avoid this dialogue and send the report directly to the printer without user interference.

C# - Avoiding Deadlocks And TimeOuts When Processing Huge Data?

Oct 14, 2010

I have code in an ASP.NET form that needs to, depending on user entry create messages in the database. We are speaking of potentially thousands of db entries. How do I protect against deadlocks, I mean apart from using Transactions and setting IsolationLevel to Serializable, as well as using WITH(NOLOCK) statement on my select statements since I don't mind a dirty read.

[Code]...

Differences Between VB Functions And Convert.To* Functions?

Feb 19, 2009

While converting types, I have found myself using both VB functions and BCL Convert.To* methods.
E.g.)

Cstr() vs. Convert.ToString()
CInt() vs. Convert.ToInt32()
CDbl() vs. Convert.ToInt64()
etc...

Are there any subtle differences that should be noted?

[2005] MembershipUser Functions - See Exactly What The Functions Are Doing?

Mar 4, 2009

Is there a way to see exactly what the functions are doing. What i mean is there a way to see the class? I know what it does, i just want to know the code.
For example the function: Membership.FindUsersByName()

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