vb net for dummies

Tray program refers to a kind of program: when the program is run, will be in the system tray area (also said to be the status area) to create this program icon, users can click on the menu icon appears to control the operation of the state. Pallet programs have many advantages, such as not taking up the screen, running in the background, easy to control and so on. So now more and more programs are made of the tray program. In vb.net, it is more convenient and simple to write a pallet program. T

the configuration file to add a reference; Right-click on the layer to add a reference; 2. Using the configuration fileThe database connection character is used in the program;For example: Dim connstring as String = Configurationmanager.appsettings ("connstring")Summary:The benefit of the configuration file or in the continuous implementation of the system to continue to feel, the current can be realized in the database connection characters and database replacement, in fact,

Use vb.net to knock three layers, seven layers, but when you turn on regenerate, the following error occurs.The error window displays:Unable to open module file "C:\Users\sq\AppData\Local\Temp\. Netframework,version=v4.5,assemblyattributes.vb ": The system cannot find the file specified. Just started to ignore, but a succession of several times, so online check this error. It turns out to be a privilege issue.Workaround:First let vs run as Administrator. The following are the steps: Right-click

euser.pwd = reader. GetString (1) ' Take out the attribute value in column 1th and return Euser ' returns an object conn. Close () End functionend ClassThird, Login effectUser name: WangjuPassword: WJIv. Summary of LearningBy implementing a three-tier login small instance, you can see how the interaction between the three tiers is implemented, and the methods used in each layer. The first study, simply swallowed Geoscience,Back again to learn, with more questions and puzzles. In the process of

Word (1) in VB. NET Office) Here we provide a class for Word operations, which provides basic functions for word document operations. In the next article, I will provide examples of implementation of this class. For your referenceThe program references Microsoft Word 14.0 Object Library using word 2007 + VS2010 '*************************************** * ***************************** 'Author: zhang yuge, QQ

--- VB. NET Single Double ---Single precisionFirst, let's briefly explain: the project contains an amount of content, the first single, and later found that only the amount in the (-100000.66, 1000000.66) range can actually store the corresponding value, the tested code is as follows:The second digit 6 after the decimal point starts to carry, for example, 100000.66 becomes 100000.71 Private Sub button#clic

Implement the IEnumerator interface in VB. NETThis object similar to parent-child relationship is often used in object-oriented design. For example, in my current project, there are order objects, I want to use the Iterator mode to encapsulate products under an order. The IEnumerator interface in dot Net is used for iteration, to support the for each operation in dot Net.To implement the IEnumerator interfa

("Result.pdf"); Process.Start ("Result.pdf"); } }}vb.netImports spire.pdfimports system.diagnosticsnamespace mergeselectedpdfpages Class program Private Shared Sub Main (ByVal args () As String) Dim files () As String= New String () {"sample1.pdf","sample2.pdf"} Dim Docs () as Pdfdocument= New pdfdocument (files. Length)-1) {} Dim I as Integer=0Do While (ifiles. Length) Docs (i)=New pdfdocument Docs (i). LoadFromFile (Files (i)) I= (i +1) Loop Dim Doc as Pdfdocument=New pdfdocument Doc. Inse

VB. NET octopus program to obtain the RGB value of any image pointAbstract: Use the GetPixel (x, y) function in the Bitmap class to obtain the specified vertex color, and then obtain the values of R, G, and B respectively. Create an empty form application, add a Picturebox control, a Button control, three label labels, and three Textbox controls to form Form1. The following code is very simple. First, selec

Next, let's take a look at sqlhelper. 1. UML diagram 2, three-tier architecture 3, sqlhelper 4, Configuration File 5, interface 6, design mode I want to begin by saying, in fact, I have successively published several articles about "VB. net Let's talk about this sqlhelper today. When I used the three-tier Data Center charging system for the first time, I didn't use sqlhelper at all, nor did I know what

Private sub button7_click (byval sender as system. object, byval e as system. eventargs) handles button7.click msgbox ("range:" getweekperiod (Me. monthid. text, me. weeks. text) (0) " getweekperiod (Me. monthid. text, me. weeks. text) (1) end sub private function getweekperiod (byval monthid as string, byval curweeks as integer) as date () dim totalweeks as integer dim y, M as string y = monthid. substring (0, 4) M = monthid. substring (4) dim firstdayofmonth as date = new datetime (Y, M, 1)

) / 2 ; 10 If (RS = A [Middle]) 11 { 12 Return Middle; 13 } 14 If (RS A [Middle]) 15 { 16 End = Middle - 1 ; 17 } 18 If (RS > A [Middle]) 19 { 20 Start = Middle + 1 ; 21 } 22 } 23 Return - 1 ; 24 } VB. NET Code Code highlighting produced by Actipro CodeHighlighte

Abstract: In VB6, Treeview is often used to represent hierarchical data. Code , Requires a large number of manual encoding; in VB. net, due to the enhancement of the Data Binding function and the enhancement of the language features, it is easy to bind the Treeview and hierarchical data. This article will first create a dbtreeview inherited from the Treeview, then, you can bind the hierarchical data of a u

The following method creates a bubble prompt box with AE: 1. VB. NET source code ''' ''' Create a text prompt box ''' ''' ''' ''' ''' ''' ''' ''' Public Function createtextelement (byval X as double, byval y as double, byval ptextstring as string, optional byval Ppoint as ipoint = nothing, optional byval pgraphicscontainer as igraphicscontainer = nothing) as ielement Dim pelement as ielement = new markerel

life which has sex more than what, name less than what conditions So I once again designed a window, from which four field names are selected as a combination of query conditions to simplify the combination of query difficulty, the main interface design such as the following:Next, take a look at our detailed implementation process, first the entity layer---e layer;data Access Layer---d layerbusiness Logic Layer---b layer;Display Layer---u layer;Performance effects such as the following:Since th

How to draw a rounded rectangle in VB. NET and adapt to the form size? Public Class Form1 '************************************ * ******************************** 'Author: zhang yuge, QQ: 3107073263 group: 309816713 '. If you have any questions or suggestions, please contact me, everyone makes progress together '************************************ * the Private Function of drawing the rounded rectangle. ge

The following area is found and can be automatically executed.C #AndVB. NETMutual conversion!Here: Convert Between C # and VB. NET Here, it's good! -------------------------------------------------- Lee Sen-ListenE-mail: lisencool@gmail.com Statement:Here we focus onWinCEAndWindows MobileSome basic knowledge in development. I would like to share with you, and I hope

Source: http://www.codeproject.com/KB/grid/Datagridview_BackImage.aspx VB. NET Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--> Imports System. componentmodel Imports System. Drawing Public Class Userdatagridview Inherits Windows. Forms. datagridview Private M_image As Image Public Sub New () ' Me. m_image = drawing. image.

In VB. NET, the type of sequence handler is very different from that of C. For example: Protected sub button#click (byvalSenderAs object, byval e as system. eventargs) handles button1.click, button3.click, button4.clickType: 'category-specific!'Dim BTN as button = ctype (Me. Controls. Find ("itemnumber", true) (0), button)Dim BTN as button = ctype (Sender,Button) If it is C #, you can directly convert

Update NBearLite to v1.0.0.6 beta Fully supports SQL Server, Oracle, MySql, and PostgreSql database Stored Procedure Call code generation (C #/VB. NET) and various parameter types such as input, output, and return. Sub Query is supported. Save able/DataRow is supported. See: http://www.cnblogs.com/teddyma/archive/2007/07/20/825384.html Introduction Use nbearlite.querycolumnsgenerator.exe and specify the tar