I am not sure how to phrase my question properly but I want to achieve something like this.
I have a class named Products public class Products
private ID as Integer
private Name as String
Public Property ProductID()
Get
Return ID
[Code]...
When I do the same, I am getting an error "Object Reference Not Set to an Instance of an Object.
I have an SQL statement like:
SELECT FNAME, LNAME, CITY from EMPLOYEE
How do I create a multi-dimensional array from a datareader which should store values like:
John, Doe, LA
Mike, Johnson, PASADENA
Freddy, Kruger, Long Beach
This task is a little out of my reach so i dont even really know where to start...I want a user to click the command field "select" in my gridview. I then want them to be redirected ( response.redirect()) to an input form that will have its various asp.net text boxes filled with data from that selected item. I also need the ability to do this logical process:
IF the form is loaded from user
selecting item in gridview THEN
''Populate controls with data from selected gridview item Else Load
[code].....
Visual Basic 2010 Express: I have a form with a combobox that is populated with the names of locations from a datagrid which in turn was imported at run-time (Form_Load) from an Excel database. The Excel database (and the datagrid) also stores the information for addresses and phone numbers for their respective locations.
What I would like to do is have the phone number and address text boxes automatically be updated with the proper corresponding data when the user selects a location from the combobox. Whether the text boxes are updated from the datagrid or Excel database is not a concern; I'm mainly looking for whichever way is simpler.
I am developing a Windows application in Visual Studio 2005, V2.0 using VB.NET.I am coding part of an Emergency Response Information System. On my form, I have two combo boxes (cboBaseStationID and cboPriority). I am trying to populate the datagrid with records from my database based on what is selected in both comboboxes. For the first combobox, the user selects a name so the datagrid must only show records with that name. For the second combobox, this is a little more complicated. There are four emergency priorities in the combobox that the user can choose - 1, 2, 3, 4. In the database, there are different response teams (to be dispatched to these emergencies) and each response team has a grade of either 1, 2 or 3. So a grade 1 team can respond to emergency priorities of 1 and 2.A grade 2 team can respond to emergency priorities of 1, 2 and 3.A grade 3 team can respond to emergency priorities of 1, 2, 3 and 4.
So basically, if the user selects emergency priority of '4', then only grade 3 teams can be displayed. I am using two different tables in the datagrid. The datagrid is populating at the moment, but not based on anything that is selected in the comboboxes. It just displays a lot of duplicates of all the records in the tables. Here is my code so far (this code is on the search button click - I have already loaded items into the comboboxes on the form's load event):
Dim sqlConn As New OleDb.OleDbConnection
Dim sqlCmd As New OleDb.OleDbCommand
Dim sqlReader As OleDb.OleDbDataReader
[code]....
i have an array contains a-z.Then i have a textbox and when click on the button, it will replace the text inside the textbox to the index number of the array.Example, from "abc" will become "0 1 2" The code below do the job.how to do so that i can replace the text inside the textbox from "0 1 2" back to "abc" based on the array?
Dim txtKey As String = readKeyTxt.Text
readKeyTxt.Text = ""
For Each b As String In txtKey[code].....
This is some of my code. But how do I populate a datagridview using the datareader.
Dim strSQL As String = "SELECT peopleid,firstnames,surname FROM people;"
Dim cmd As New MySqlCommand(strSQL, con)
'cmd.Parameters.AddWithValue("Parameter1", strName)
Dim reader As MySqlDataReader = cmd.ExecuteReader
and how can I handle null field values.
I'm looking to populate an object then display the data to labels.[code]...
View 2 RepliesI am trying to populate a listbox from an access database. It is a scheduling database. First my users pick a room they would like to add an event to, then a date. after the date is selected, id like the listbox to populate with meeting titles corresponding to the date they selected. The code so far looks like this:
[Code]...
I have a need to populate a data object containing 30+ properties from a database table. I could create a simple class containing a public variable for each of the required properties, but I don't want to.
Is the following code a bad idea:
<Serializable()>
Public Class DtoEmployee
Public EmployeeId As String
[Code].....
When I try and populate a listview with data from an array with 3 entries I find that the data goes into the wrong columns. The array consists of the following.
?ID
{Length=3}
(0): "T123456789"
[Code].....
I want to pull data from database and populate an array. Field one: A short name to call the second. Field tow: A connection string to a database.
EG: Cstr=Connstr("OrDB")
The known name of OrDB would result in a string assigned to the variable Cstr that could be a connection string to an oracle database.
I have a database with table "Customer" that will be the datasource for my form controls. My form has a combobox and various textboxes that need to change based on the selectedvalue in the combobox, cboCustNo. Firstly, I'm try to get the combobox to populate with the customer names on the table but have the value member of the combobox set to their customer numbers (just for ease of indexing). Based on the user's selection I'm trying to have various textboxes show the corresponding data (Address, City, Balance, etc.). The code I have so far is below:
Dim cnnDB As New Data.OleDb.OleDbConnection
Dim cmdSelect As New OleDb.OleDbCommand
Dim rdCustomer As OleDb.OleDbDataReader
Dim CustTable As New DataTable
[Code]....
I have this code:
Private Sub EditPage_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load'TODO: This line of code loads data into the 'InventorySysDataSet.tb_master_products' table. You can move, or remove it, as needed.
Me.Tb_master_productsTableAdapter.Fill(Me.InventorySysDataSet.tb_master_products)
sqlCnn = New SqlConnection("Data Source=ZEREYSQLEXPRESS2008;Initial Catalog=InventorySys;Integrated Security=SSPI")
[Code]...
what i want to do is to automatically change the selected option of the cboProductCode on page load depending on the result of a query executed onload also.
Say I have a data file that was created in VB6 like this:
Dim arr As Variant
Dim unit As Integer
Dim i As Integer
unit = FreeFile
Open "SomeFile.dat" For Binary As unit
[Code]...
I'm working in VS2010 on a visual basic application. It takes in serial port data, writes it to an access database, and then graphs the data.The data only comes in once every minute, so it's not like I'm building an oscilloscope. Right now, the chart is reading from the database using a table adapter and graphing just fine, so long as I keep the number of records in the database low.If I add too many records to the database, the chart shows a red "X" through it. I've played with changing the axes, but it is still a problem.I don't really need to graph the whole database.The twenty most recent records would suffice.How can I make a chart series with only a small subset of the database in it.Perhaps it cold be populated with a query?
View 1 RepliesI have a query in Access 07 that identifies the following fields: ContractID, status, start date and end date. For each contract, I've been able to search a network share and upload its corresponding file; however I need to skip the import and write a record to a table for contracts with the same start and end date. I've included a placeholder (in bold below), but how do I make the date comparison work? Do I need to create a multi-dimensional array for that or can it be done with the code I have?
Private Sub cmdRefreshList_Click()
DoCmd.SetWarnings False
'Create an array based on the true-up contract IDs.
[code]....
I am creating a project in VB.NET in which one of the reports require that the name of employees should be displayed as column names and whatever work they have done for a stated period should appear in rows below that particular column.Now as it is clear, the columns will have to be added at runtime. Am using an ODBC Data source to populate the grid. Also since a loop will have to be done to find out the work done by employees individually, so the number of rows under one column might be less or more than the rows in the next column.Is there a way to create an empty data table and then update its contents based on columns and not add data based on addition of new rows.
View 1 RepliesI want to load all of the LOCATIONS in the Location table to a Combobox and then for any found locations (in another table) to be deleted from that combobox. Im using a Array list, but can't get the Data reader to write to the Array list.
Dim SQL As String = ""
Dim Reader As OleDbDataReader
Dim i As Integer = 0
Dim LocationArray As ArrayList = Nothing
[Code]...
How do I load data from a datatable into an array.
Dim
dtDataTable As New System.Data.DataTable
dtDataTable = dsStaffHoursWorked.vwGroupProjHoursDate
Dim DRs = dtDataTable.Select("enddate = '05/14/05'")
Got an array, why cant I save dataread info to array pos?
While myDataReader.Read()
' txtPhone.Text =
Tempstr(i) = myDataReader.Item("Phone").ToString + vbCrLf[code].....
apparently Object reference not set to an instance of an object.
Basically I have a simple while loop that loops through a datareader and saves the information into a object collection. Later on in the code I have a simple function that loops through the collection and exports the data to excel. The later part works flawlessly.OK the issue is that for some strange issue If I just let the while loop work as it should it misses records in the datareader stream. Now it sounds crazy but if i add a counter (x=x+1) along with a message box at the end of the loop to tell me the value of the counter (msgbox(x)) it ALWAYS saves the correct amount of records. If I take the msgbox line out it ALWAYS misses records. I am so boggled right now.[code].....
View 18 RepliesHow can I fill this Percentage array with Sql data reader..
Dim StudentID As Integer = Me.ComboBox1.SelectedValue
Dim Percentage() As Integer
Dim con As New SqlConnection("Data Source=.SQLEXPRESS;AttachDbFilename=D:Database
[code].....
I would like to retrieve a single column of about 800 rows in a table and save these values in an array so as to reference them later on. How can I do it? I tried:
[code]...
And it didn't work. The col1 is of type Int64 and so is the array prev_ob(). Please let me know how I can save it to an array.
I am using a datareader to pull data from my database. I store the data in a multidimensional array in a seperate class file. I access the values in the array from a form through properties.The problem I am having is when I run the project as I step through the code I can see the values being added to the array but when access it from a string property it shows up as string System.String[,]. I would like to have my array transposed accross the listview under the corresponding column. below is the code I am using.
[Code]...
How do i populate my state combobox,such that when i select the appropriate country my combobox will automatically display the appropriate state?
View 7 RepliesI have a combobox wich I want to populate based on the value of another combobox.[code
View 2 RepliesI'm working on a small project, and ran into an issue. I'm creating new picture boxes on a form to represent a control. My question is how would I code a click event for an object that isn't on the forum initially? Also, how can I keep track of which object is assigned to which data in an array? (IE picturebox 0 is array(0) of data)
View 7 RepliesI am currently stuck in one part of my application. I have two combo boxes that i am having the users select from. The first combo box is simply bound to a datatable. that is working properly. The second one i need to populate off another datatable after sorting out what the first one is requesting. Basically it's choosing a line number on the first box and then selecting the machine associated with that line number.[code]...
View 4 RepliesI know that I can populate a menu using a .INI file but I was wondering if it can be done using an XML file. I would like to be able to add parent and children menu items.
Below is a sample of what I want my XML to look like.
<?xml version="1.0" encoding="utf-8" ?>
<!--
MENU only needs an ID
[Code].....