I have this code that I got from somewhere, I forget where, but it adds a checkbox array to my form. Now I have a button on the form that when pressed it will check all the checkboxes but instead I keep getting the error NullReferenceExpection where I put that red arrow. What am I doing wrong?
Public Sub frmAlarm_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim Ypos As Integer 'Need to move the position of the checkboxes down
Dim NumWeek As Integer ' This is the number of checkboxes
I am very new to VB and trying to understand Array's. I am having trouble referencing the contents of the Array in other areas of my application and I ma getting object Reference Errors and the contents of the Array appear as Nothing and I get a null reference error.
The Array is being loaded from the Sequel Server and I am adding two columns to the Array to add data. I am getting all of my Array in the Return Array, however I acm unable to reference contents of the Array and write out the contents. I need to reference the contents.
The Array is called MyArray, and I need to reference each part of the Array as MyArray(irow,1) for example.The irow will always vary but I will always have 10 columns. How can I reference the Array in other parts of the application? I tried dimensioning the array at the Class Level, but the array shows nothing in it.
My Code here works and the Array Returns with all of my data that I need all ten columns, but I can't reference the pieces of it elsewhere in the application in another button event in a Private Sub or Public Sub.
I need to have plenty of checkBoxes & textBoxes in my vb.net form.I need CheckBox array to reduce coding of their events.But I am not able to create array of them like in VB-6 Also I need to make them at design time only.So in coding writing like
dim chkBox as new CheckBox()
And then setting location & text of each of them is not at all feasible for me bcoz I need to have near about 100 of them in my form.
First of all, I declare myBox(10) as checkbox, and Count as integer,then in the page load section, I create a html table and add the checkbox in each row:[code...]
How will create an array of checkbox, I dont know to create it on vb.net but as far as i know in vb6 you're just going to create a toolbox then if you copy and paste it,it will automatically ask if you want to create an array of it but I really nid it in vb.net, I want to create 5 checkboxes,for example the name of the checkbox would be checkbox then they're indexes would be checkbox(1),checkbox(2),checkbox(3),checkbox(4),checkbox(5). I tried it to write in codes but something is wrong,the program can't understand what just I did,here's my code.
In the long rung, I'm trying to setup a program to have a local database of files (It's a media player, so think of the library in WMP). I'm just trying to figure out how to do it, so this is a proof of concept thing I'm having a problem with.
Here's the code:
Code: Dim dsDataset As New Database1DataSet Dim drRow As Database1DataSet.FilesRow
I need to produce a report for my program. I would have liked to make the report an excel file that gets data through my program. However this program may go out to people who dont have excel on there pc or have different versions to what we are using.So i had an idea that perhaps if i reference excel in my program then it will not matter if a user does not have excel on there PC.
having a bit of trouble with a bit of code. This is going to be a bit complicated to explain so i hope i can get the idea across. The idea is that the following bit of code uses an array called "lines" which has been loaded from a text file in a previous subroutine. I then want the status of each Checkbox to edit a set of lines in the array.
I have written a program in VB.NET 2008 Express that references a .NET managed dll. I simply added a reference to the dll to the project. I then 'Imports' the dll at the beginning of the program and then can use it. Everything works fine when I am running the program in debug mode (and it uses the dll as intended), but as soon as I go to build the project I get an errors that it "Could not reslove this reference" and "Namespace of type specifier in the Imports 'ModbusTCP' doesn't contain any public member or cannot be found." The dll is located in a different location on my hard drive to the project location, but this was referenced when I 'added reference'.
I'm converting a VB6 app (that works fine) to VB.Net app for work using Visual Studio 2008 Express. I have Word 2003 SP3 on my laptop. I need to open an existing Word document; edit it; and save the changes. Now in VB.Net, when I try to do 'Imports Microsoft.Office.Interop.Word', only Microsoft.Office.Core shows up as a choice. I have Microsoft Office 11.0 Object Libary referenced. I've been searching the internet for hours but can't find any thing that helps. Can anyone here point out what I'm doing wrong? How do I get ...Interop.Word to show up as a choice?
Basically the code below is supposed to load data from a reader into a datatable, then compare a date to the start date and end date in each row of the table.However, I am getting errors on the if statement indicating Overload resolution failed because no accessible '>=' can be called with these arguments.I can probably do this with just the reader but I am playing around with a data table because I know I will have to learn how to cycle through the records and look at them at some point and this is a simple example I can use to do this.[code]
I have 15 checkboxes of control array and at run time fill any 4 or 5 or 6 check boxes with color using colordialog. How can i send the colors to the sql server table using for loop using code at runtime
Often I have a list of object A, and I have another object type B that needs to hold a reference to one instance in that list. So, as far as I can imagine, it's three ways to hold such reference:
1. Make B hold the instance variable of type A 2. Make B hold some other key/ID of the A instance 3. Make B hold an integer of the list index of the A instance
I guess 3 is quite limited, and mostly suited for use locally inside a method, in a for-next loop etc. But with the other two I tend to have the feeling that I should use 2) over 1), as I believe I shouldn't "duplicate" the object.. But wonder if that is a mistake. I guess it's only holding a reference to the stack memory, so it doesn't really make any overload compared to holding just an integer key/ID..
Further my thought is that with 1), I don't have to loop through the list to get the correct instance, as it already holds it. However if A changes, it may not be reflected in B.A, if the A has been given a new instance, so then 2) would instead give access to the updated object A. So perhaps if A is a "dynamic" object that may have been reinitialized (if that's a word), I need to use method 2). However if it's a type of object that is only changed when for example the user opens a program settings form, and this setting form only changes value type variables, then perhaps 1) is appropriate?
This is kind of the case I have some times, and I wonder if I should then use 1), as it doesn't require me to loop through the list by key/ID. It makes other object hold the full reference, which is not really necessary, but maybe still more efficient? Although at the same time, maybe I shouldn't really care much about looping through an object list either, if the list is not very big.
I have a collection class, say ITEMS, that inherits a Dictionary (of String, SINGLEITEM). From the SINGLEITEM class, I would like to reference a property in the parent ITEMS class, what is the best way to do this? For example, say the ITEMS class has an IsDirty property and I would like to set that if ANY of the contained SINGLEITEM objects is modified, what's the best way to go about doing this?
I know I could add a reference to the collection class in each SINGLEITEM class (since I override the ADD method, I could make this assignment), but this seems like overkill.
I cant grasp it right now, lol. So here's what Im trying to do: I have two tables, a main table, and an employee table, with a foreign key in the main table pointing to the employee number in the employee table. Im trying to use a databound datagrid to show everything from the main table, and the corresponding name of the employee number referenced in the main table. Is there a way I can do that using DataSet.Table.Column.Expression, or what would be a simple way of doing this? I cant use TableAdapter b/c sometimes the database is offline, so preferably with datasets.
We have currently upgraded our development machines to Windows 7 and Office 2007. We have a vb 2008 app that references 2003 Office components to use for mail-merging to word.We loaded up our app in the vb environment today and were instantly greeted with missing components/functions which are related to the 2003 Office components. We can update these to use the Office 2007 components/functions instead, however we are unsure whether after doing this our vb app will work with machines only with Office 2003 on. can machines with Office 2003 on work with our vb app that references Office 2007 components?
I have a question, I can't really find the answer...Basically I have 2 FormsIn form number 1 I have 2 pictureboxes. I want to create a checkbox in form2 that says if checkbox 1 is checked then show picture 1 in form 1
I have a ListView with Checkboxes in vb.net and what I want to do is when the user check the checkbox, the program ignore the response of the user in checking the checkbox, instead it leaves the checkbox uncheck.
I am creating an Interactive map which displays the facilities when the user clicks on the Checkbox, such as toilets.It will display all the toilet locations via PictureBoxes.I want to do this without having to write all this code?[code].....
i have 5 checkboxes in webform and textbox1... when i search the record using the date specified in textbox1 when i enter 11-Dec-2010 in Textbox1 and click on submit button then checkbox1, checkbox2, and checkbox3 will be disabled and unchecked .....
I have a DataGridViewCheckBoxColumn who's column name is "booReadyToReport want to hide all the checkboxes in this column if "bintAnalyteCodeID" doesn't equal the selected value in a combobox on my form. ut I run this bit of code the DataGridView DataError event fires currently, have nothing in the event except an comment. he code seems to work, but I'm new to VB.NET and I'm wondering if this is the correct way to handle thishould I use the CellPainting event?
highlight rows with RBF3 For Each dr As DataGridViewRow In Me.dgvCalculatedResults.Rows f dr.Cells("bintAnalyteCodeID").Value = Me.cbxAnalyte.SelectedValue Then
I have some DataGridView code written in vb.net. (Nothing is attached to a datasource.)The 4th column is a checkbox cell.How do I detect if that checkBox is checked or unchecked?This code strangely reports TRUE or FALSE at random times. It even turns ON the checkbox in rows other than the row I clicked in. (Huh?)
Private Sub DataGridView1_CellContentClick(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DataGridViewCellEventArgs) Handles DataGridView1.CellContentClick Dim whichGrid As DataGridView = CType(sender, DataGridView)
[code].....
I've tried countless other methods... none seem to actually get the checkbox ON/OFF value in vb.net.
I've got a form with parent-child setup. The parent displays name and other demographic info.The child displays multiple addresses, one row at a time. There can only be one primary address for a name and this is designated by a checkbox at the top of the child form.If the user wants to change the primary address to another address,then they find the other address and click on the checkbox.The form checks the other addresses and if one is found that is designated as primary,the user is warned that one already exists and prompts them to change it.
So for example, a name has 2 addresses, the 2nd being the primary address.The user wants to change the 1st address to be primary.They click on the Primary Address checkbox for the 1st address.A warning displays that there is already an address listed as primary.The user then answers the prompt to change the 1st address to the primary address.The checkbox for the 2nd address will be unchecked and the checkbox will be checked for the 1st address.My problem is getting the checkbox unchecked for the 2nd address.If I close the form and reopen, then the checkbox is unchecked.How do I refresh the checkbox for the 2nd address?Here is the code I'm using to find if an address has already been marked as primary:[code]......
I am trying to identify the value if a checkbox against a record in a datagrid.
I am trying this:
Dim eRow As Integer eRow = dgv.CurrentRow.Index TextBox1.Text = dgv.Item(6, eRow).Value
But I get nothing it works on other fields in the datagridview. The user will de-select records he does not want to authorise. When he has done this I want to update another table with the values that are selected(or True) on a button click event. There could be 100's of records so not sure if this is the best way to go about this.
ok in my webbrowser1 there will be a checkbox is there anyway to click it just bye the test next to it like in this picture it has "Remember me on this computer. " is there a code to click it just by giving it the text that is next to the checkbox ?
