C# - Lock Statement In VB

May 27, 2009

Is there analogue of lock statement from c# in vb.net?

View 3 Replies


ADVERTISEMENT

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?

View 29 Replies

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?

View 13 Replies

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

View 6 Replies

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?

View 1 Replies

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]...

View 3 Replies

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

View 7 Replies

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]....

View 4 Replies

Return Statement Which Is True In An If Statement?

May 24, 2012

Return statement which is true in an if statement

View 3 Replies

Break Up The Code In A Method Body Into Statement By Statement Symbols/"tokens"?

Apr 22, 2011

I'm writing something that will examine a function and rewrite that function in another language so basically if inside my function F1, i have this line of code var x=a.b(1) how do i break up the function body into symbols or "tokens"?I've searched around and thought that stuff in System.Reflection.MethodInfo.GetMethodBody would do the trick however that class doesn't seem to be able to have the capabilities to do what i want..dit 2:basically what I'm trying to do is to write a program in c#/vb and when i hit F5 a serializer function will (use reflection and) take the entire program (all the classes in that program) and serialize it into a single javascript file. of course javascript doesn't have the .net library so basically the C#/VB program will limit its use of classes to the .js library (which is a library written in c#/vb emulating the framework of javascript objects)

View 4 Replies

Exceptions - Can The "Throw" Statement Exist In A Block With No Try/catch Statement

Oct 5, 2009

how to use them then before, but am still a little confused with a few aspects. Here goes:

1.) Lets say you have a method that checks for a certain condition(s) and if it fails Throws an exception. Does it have to be in a try/catch block? Meaning can the "Throw" statement exist in a block with no try/catch statement?

2.) Now lets say we have a method that has a try catch block and in it there is a throw statement. When the throw statement is executed does it first try to find an appropriate catch block in the same method or does it immediately go back to the calling method without looking at the catch statements in the current method where the exception was thrown?

3.) I created a custom exception class that inherits from ApplicationException. Next I created a method which has a catch block that catches this type of exception and does some action. Is the System(i.e CLR) smart enough to throw an exception of this type, or does it only throw exceptions from SystemException?

4.) I know that some people are more liberal in their use of exceptions and others use it more sparingly when truly strange stuff happen like the DB going down. I am writing code where I am getting some info back from the database, converting it and then storing it. Sometimes there might be data that comes back from the database and other times the field is empty and the Null value comes back. Therefore in the instances where Null comes back from the database I should not convert the value to anything, since I will get an error. What should I do in this situation? Should I let the CLR throw the exception when it goes to convert the Null value or should I check for the Null value and if it exists not convert?

5.) In general when I throw exceptions, is it sensible to only throw exceptions of the type Application Exception or are there instances where the programmer throws exceptions of the type SystemException?

View 2 Replies

How To Lock Form

Jan 23, 2009

Basically,I had a button in my form1,when I click it,then form2 will be display...Now I would like to lock form2 until a button in form2 had been clicked,then only I can do anything in other forms...I means form2 must be closed before I can remain to form1.

View 1 Replies

How To Lock Screen

Dec 15, 2011

VB.net how to lock a computer screen using a form

View 3 Replies

Lock A Row In MySQL?

Aug 23, 2010

How do I lock a row in MySQL and then only allow the app that locked it to change the values of that row?

View 7 Replies

Lock Down A Function?

Dec 28, 2009

Wrote this code:
Function ReadRegistry(ByVal regType As String, ByVal RegPath As String, ByVal KeyName As String)
Dim regKey As RegistryKey

[Code].....

What I want to do is raise an error if I get passed a value that isn't listed in the case statement.. or it there a way to define it better?

View 7 Replies

Lock Records On SQL?

Sep 25, 2009

I have a form and its filled from a VIEW of two tables on SQL server. When its opened i dont want other users opening that customers details from either table.I know SQL itself prevents writes if its opened but i want to stop people opening the record in the first place.[code]...

I then tried writing these values to the db on the form loading but it doesent work - it just sends back NULLs. I tried the same code in the on load event into a button and it works fine there. So im thinking i should do this as a Trigger on SQL itself, but im unsure how i could get the users computername or Windows Login name, or even username from the front end im building.

View 7 Replies

Lock XML File When In Use?

Dec 6, 2006

I am using XML files to store some iformation that are to be processed. I use this code to interact with the XML file:

Dim xmlDoc As New XmlDocumentxmlDoc.Load("theXMLFile")

Do XML stuff such as add elements...

xmlDoc.DocumentElement.AppendChild(oAlarm)xmlDoc.Save("theXMLFile")

What I want to do is to lock the file so that no other process can use the file. If a process wants to use the file, I also want it to wait and try again until file is available.

View 3 Replies

[2005] Lock The PC Using .net?

Aug 7, 2007

how to lock PC using VB.net? So that any user cannot do anything on my PC?

View 10 Replies

Set Its Screen Position And Lock It There?

Oct 14, 2010

But not my application.A app i use refuses to be brought forward, so wondered if there was a way for a vb app to run in the bg that can force a specified application to stay on top, & even maybe set its screen position and lock it there???

View 6 Replies

Alternative To Transaction Lock?

Mar 20, 2012

In my project i am using begin transaction commit or rollback changes. but this causes lock to the tables in that particular functionality.

So if the any other user does any other functionality those locked table are not available until the transaction is completed. I want to know if there is any alternative to transaction which insures data security but the tables are not locked out.

View 1 Replies

BitmapImage In WPF Does Lock File?

Jun 21, 2011

Dim bmi As New BitmapImage(New Uri(fiInfo.FullName, UriKind.Absolute))
bmi.CacheOption = BitmapCacheOption.OnLoad
this does not Use OnLoad

[code].....

View 2 Replies

Bypass The Loader Lock?

Mar 29, 2011

how would i bypass the loader lock. I know there is a way to disable it but im not sure how

View 2 Replies

Code Snippet To Lock PC

May 15, 2010

This is a part of my project, my project basically uses a motion sensor to detect any intrusion. So one of the modules is to lock the PC on detection of an intruder. Is there a way to lock the PC using Visual Basic?(Because most of the other modules have been programmed in Visual Basic.) I am basically looking for source code that can implement something similar to "Windows button + L".

View 1 Replies

Code To Lock Workstation?

Feb 23, 2012

I'm working on a small program to activate winlogon,and to automatically log out of my account, but I'm unsure how to implement this in code.

View 2 Replies

Detect Key State Of Num Lock?

Feb 3, 2011

I'm trying to detect the state of num lock but haven't had any luck. using a windows 7 x64 machine.

Declare Function GetAsyncKeyState Lib "user32" (ByVal vKey As System.Windows.Forms.Keys) As Short
'num lock check timer

[Code]....

View 7 Replies

Get The Current State Of Num Lock?

Sep 2, 2009

How do I get the current state of Num Lock in VB.NET?

View 1 Replies

How To Lock A Textbox To A Cell

Aug 15, 2011

I have a windowsform in visual studio 2008, I connect to a ms sql-server.On my form I have a datagridview who I use to enter data etc and save them to the database. I then have textboxes who shows the sum of the columns etc in the table abd save that value back to the database. but for instance if i put the cursor in row 2 of the datagrid the values in theese textboxes dissapear.What I want to know is if there is apossibility to lock the textbox to ex. table test, clomn x and row 1??

View 2 Replies

How To Lock A Textbox Using Code

Jan 24, 2012

I'm newbie in VB .Net.I do want to lock a textbox but I cannot supply the right code for it.

View 2 Replies

How To Lock Keyboard And Mouse

Jun 8, 2011

I am using vb.net framework 3.5. I want to lock input devices like keyboard and mouse from my application. Is their is anyway using sendkeys or any method to lock?

View 5 Replies

How To Lock Label Position

Jun 22, 2010

I need to lock label position. so, my label can't move at all.. now, i'm using label1.Enabled = False.. but, my label.forecolor become gray..

View 7 Replies







Copyrights 2005-15 www.BigResource.com, All rights reserved