i have to populate data from mysql table into an array. I have a table which stores the x-coordinate and y-coordinate of a node. I got to retrieve all the x and y's into an array. I am having difficulty doin that as i am now
Below is the code i've been trying:
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
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Public Class Form1
Dim str As String
Dim strA() As String
Dim strB() As String
Dim f As Integer = -1
Private Sub btngo_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btngo.Click
If txtmain.TextLength > 0 Then
str = txtmain.Text
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This program is very difficult for me, but I must get threw it or I cannot finish... What I am doing is making a Database of foreign Languages with the spelling of the words and the pronounciation inside the database... The USER enters a paragraph of words into the translator textbox and pushed translate. The program has a DATABANK of words with the phonetic spellings and matches the word, then translates to phonetics. The problem is that new words keep appearing inside the language. So I incorporated a Database of 2 fields
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i need to make a database application that can write/retrieve cells/datasets from/to a database i buyed a book in there was an example of how to create a database application while debugging i had the "Object reference not set to an instance of an object." error and it highlighted this code
objDataRow = objDataSet.Tables("KlantenTable").NewRow
now the problem is here i declare something later in the code i write to it
objDataSet.Tables("KlantenDataTable").Rows.Add(objDataRow)
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1. First off, how do I make my path to my database relative? The path is currently absolute and is: Data Source=J:/College/AS_DSFinalDatabase1.accdb
2. Second of all, where do I save my database in the project? I want it to be included in like project folders...kind of like the App_Data folder in ASP.Net.
3. I'm recieving an error whenever I try to populate more than 1 DataGridView upon form load for some reason...I've tried 5 different ways of writing the code, and I get the same error...there's no error description, so does anyone know what the issue is? Here's the error:
how do I declare an array with an array? Say I have the following
item11
item12
item21
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Imports System.Net Public Class Form1
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Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
I do have to create at runtime a list that will contains some methods. These will be called in proper time.
So far, I used reflection and have made an array of methodInfo.
The problem is that these methods do have different signature, and I also need somehow to get the value of the arguments to follow their method.
And finally, I need to be able to put all this together and invoke these method when the time comes
is there a way to make an arry of buttons in vb.net in VB6.0 there is a prop of buttons name Index but not in VB.NET so if there is some way to do that,[code...]
View 2 Repliesi want to make a vb.net program that reads from a text file a movie, with the help of a Open Dialog (called openFD in my program) (we don't know how many movie we've got), the actors, the release date, the country, and the rating.
The text file look like this:
Movie1;Actor,Actor,Actor1;Date1;Country1;Rating1
Movie1;Actor,Actor,Actor1;Date2;Country2;Rating2
...
First question: How can I make a 2-dimensional array? line(0,0) - Movie1, ... , line (1,5) - Rating2. Here Is my try, but it's not good:
Dim line As ArrayList = New ArrayList()
Dim itm As ArrayList = New ArrayList()
Dim i As Integer = 0
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And here is the code for the Delete Button. It deletes a movie from the listbox, but the details of the deleted movie remains for the next one, I must delete the details for the deleted movie, too.
ListBox1.Items.Remove(ListBox1.SelectedItem.ToString)
I'm trying to make a public array that I can use in Form1.vb and module1.vb.
It seems to work fine in Form1.vb but module1.vb complains about that it isn't declared.
This is how I've done it: I placed it right after this line in Form1.vb:
Public Class Form1
Public SuffixArray() As String
how I declare a Array that I can use in all forms and modules?
I want to try/use this code [URL] now im stuck with the last part, how can i make an Array list?
View 5 RepliesI've been making a table control for a few days, and I've got to the point of making it capable of accepting new data. To do this, I'm making it generate a row of text boxes, combo boxes, and date selection windows along the row that you're entering data into.
I've tried using an array of 'control' types and changing them to whatever specific control I need as I generate it. That sort of works. For example, the code under 'Case "Employees"' below will make a combo box display on the form, but 'ControlArray(i).Items.Add' gives an error because it doesn't think that ControlArray(i) is actually a combobox yet.
You might also be interested to know that everything will have to be dynamically generated since the table I'm using will not always be the same (and the Select Case code will eventually be replaced by something that checks for relationships in the database).
Dim ControlArray(NumberOfColumns - 1) As Control
For i As Integer = 0 To NumberOfColumns - 1
ControlArray(i) = New TextBox
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I am trying to make an array of picturesbox's. Now I need one array to loop though all the pictureboxs on the form and add them to the array. I also need another array to loop though all the picturebox's on the form however I only want it to add the ones that there names start with "ladder_" How can I do this?
-Manmax75Don't Be Scared To Ask,
What is the best way to take an array in VB.NET which can either be Nothing or initialised and give it a length of zero?The three options I can think of are:
ReDim oBytes(-1)
oBytes = New Byte(-1) {}
oBytes = New Byte() {}
The first example is what most of the developers in my company (we used to do VB 6) have always used.
I need to make a greyscale image from an array. The array is 120 * 30.
Each pixel needs to be 1*4 in size producing a final image of 120 * 120.
I've got a situation where I need a table of constants in my app. It's actually a table of 43 formatting options where the description will appear in a drop down and the detailed settings will be used by the codeIt appears that VB can't do arrays of constants. So I've fiddled around with a Constructor in a class that creates a new array then loads up each element with hard-coded .Add statements. It doesn't seem elegant though.So I then decided to try an XML file, that I load in the Constructor and assign the contents to an array. This is what I've decided is the best, most elegant, option - but I'm throwing this question in to see what you people might recommend ! The data is mostly strings
View 11 Replieshave a few items in my listbox how would I convert it into an array?
View 19 RepliesI'm in a Collage VB.Net Class and I was wondering if it is possible to make an array of expressions like : Dim exps() = { 5*4,2+3,5*2}.
View 3 RepliesImports db = System.Data
Public Class CustomerADO
Dim cid As Integer
Dim fn, ln, em, pw As String
Dim bl As Decimal
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What should I do in the while loop to make array of customers objects. And what should be the code in the form to add this array of customers to listbox.
How can i retrieve the information from Ms Access and put it into a VB.net 2D Array?
View 4 RepliesHow do i create a byte array that grows?
Say I create a loop in a new thread and in that loop I using a blocking method to read data from a socket . I receive 255 bytes at a time, until all data has arrived. I want to pop this into one larger byte array after I have received it and whisk it off to somewhere else to do nasty things to it.
How to make a control array for buttons in VB.Net? like in VB6..
is it possible that the syntax can be like this?
dim a as button
for each a as button in myForm
a.text = "hello"
next
how to make a control array of my control?
ex:
Button1(0)
Button1(1)
Button1(2)
...........
in vb6 i have no problem on doing this.. but in vbnet i don't know.
I am trying to make a jagged array that has,
3 columns
with 5,4,4 rows respectively
that each have 2 rows
that have a varying number of rows, for example 6,9,5,6,4 I have the first part setup but I don't know how to get to another level of the jagged array.
Dim potentialStructure()() As Short = {New Short() {0, 1, 2, 3, 4}, New Short() {0, 1, 2, 3}, New Short() {0, 1, 2, 3}}
And how would I access an element at say, the lowest level?
If there is an array with elements: 1,2,3,4, the program should return another array with sum of all combinations:
1
2
3
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How can I make an array of objects in VB.net. Here is the requirement. Basically I have a class named hotel. I need to dynamically add customers to the hotel class using the Customer class. So basically if in the Hotel class I can have an array of Customer objects that would be great. How can I do this in VB .net ?
Public Class Hotel
' I need an array of Customer objects. objCustomers
End Class
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I need to create a list of possible images to change picturebox controls to. I have the images loaded into the My resources folder of the solution, but I need to create an array referencing them. What data type do I use for the array?
View 9 RepliesI'm fairly new to Visual Basic (VB), but I've already got running code to access all my serial port. The problem is I want to load multiple serial ports into an array and loop through them in my functions. The program allows me to create ports(), but fails when I try to populate it.
Dim ports As IO.Ports.SerialPorts()
ports(0) = SerialPort1
Where SerialPort1 is an object I draged from the Visual Studio toolbox.
How i can make an array with unlimited range in VB.NET and also get the number of variables containing?
I tryed:
Dim _items(,) As String
_items(0, 0) = "hy"
_items(0, 1) = "hello"
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