Object Null Combo - Error When Try To Populate Some Combo Boxes With A Value

Nov 16, 2011

I am getting an error when i try to populate some combo boxes with a value, the combo box has values in and the right amount the code is getting the right number.

the error msg is "Object reference not set to an instance of an object."

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Feb 26, 2010

i have a combo box that on form load is populated but i need to know when i click an item, i will be able to code how to populate other combo and text boxes with data about the same person.

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I have the following code to insert a record into the database [code]...

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i Have this code which populates a number of combo boxes from an excel document, the problem is that it only populates the 1st three lines, does anyone know why this is??

[Code]...

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Aug 15, 2011

I'm trying to add some features to a program my company has developed over the course of several years and I'm having trouble setting the combo box to the proper index. I have successfully populated cmbIGDefaultSpacer with the color options that are available but can't manage to have it set the current color as the index. (I can, however, display the current color in a text box, so I know that the necessary values are being passed to the form.) The error I get is 'Object reference is not set to an instance of an object.' in regards to this line:

[Code]...

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Nov 3, 2010

So as the name states; I am a newer coder.

This is the code i have:

Public Sub RandomNumbers()
Dim s(4) As String
Dim RandomNumber As Byte

I don't know if you can tell what I am trying to do here, so I will try to explain.  I what to create for random numbers and place them into for different text boxes.  I also would like to do this with combo boxes and their selected indexes.  So if the combo box has 10 items in it; the new selected index would be the random number generated above.

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Jan 23, 2011

I'm in the middle of creating an application that will be used to input customer information whilst the customer is speaking to someone over the phone. This involves the customer giving the employee information such as name, address, postcode etc and the employee inputting that information into text boxes and combo boxes that are in the application.

What I would like to be able to do is after the customers information is given over the phone, I need to be able to send that information to a database which will probably most likely be done by button click. In this case, I'm using Microsoft Access. I'm also hoping that I can do this within Visual Basic coding.

The database is set out with multiple tables which include a customer table and a ticket table and both have multiple fields such as first name, surname in the customers table. Both of these tables are in use with the information that the customer gives over the phone.

I've already asked on other forums and people are where replying giving me third party programs that I could use to implement this, something I don't really want to do.

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Sending Data From Text Boxes/combo Boxes To Access Database?

Jan 23, 2011

I'm in the middle of creating an application that will be used to input customer information whilst the customer is speaking to someone over the phone. This involves the customer giving the employee information such as name, address, postcode etc and the employee inputting that information into text boxes and combo boxes that are in the application.

What I would like to be able to do is after the customers information is given over the phone, I need to be able to send that information to a database which will probably most likely be done by button click. In this case, I'm using Microsoft Access. I'm also hoping that I can do this within Visual Basic coding.The database is set out with multiple tables which include a customer table and a ticket table and both have multiple fields such as first name, surname in the customers table. Both of these tables are in use with the information that the customer gives over the phone.

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Feb 27, 2009

I used this code to created 2 combo boxes General and Specific...and Only show Specific (Combo when Combo A is chosen.....What i need now is to know how to assign specific values to the items in combo b (Specific).??? If i chose a sode, Fanta, i want the total price to be $10.00 (this price will show up in the finial price box..

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May 22, 2012

I am developing a program that makes it easier for users to log on to a website and search for specific data. I have the first portion finished in which I have a form with the Ax Web Browser control.

The web browser control navigates to a local website and automatically logs in for the end user. This is done by using code which automatically fills in the username and password and then submits the form to logon using something similar to this: WebBrowser1.Document.Forms.Item(, 0).elements("txtUsername").value = "user"

Once logged on - there is a search page which contains a combo box and list box. I am trying to set specific values for the combo box and list boxes.For example - the combo box on the website is titled: cbxDate and contains the following values: Today, Yesterday, This Week, This Month.

A list box titled: lstArea contains the following values: Zone A, Zone B, Zone C, All.I am trying to figure out if there is a way through code to select, in this example, "Yesterday" in the cbxDate and "Zone B" in the lstArea on the webpage.If anyone knows of a solution, please feel free to let me know. Be advised that I am using the Ax Web Browser Control.

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Mar 20, 2009

what is the syntax to clear a combo box and also a list box?

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Apr 20, 2010

I have tested the code for the DataSet and DataAdaptor and both work fine, and as test was able to place the MaxRows variable into one of the text boxes on my form so I know thats all ok. But I am now trying to use the function below to copy the 1st cell of each row into a combo box to populate the options and comes up with a null exception error but cant get my head around it.

[Code]...

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I'm trying to populate a combo box with some data from a xml document, but so far all i'm getting is this error message in the combo box[code]...

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May 8, 2012

I am new to Visual Basic and I'm trying to make a simple combo box that automatically populates from dataset. The table is from BaseMaterial with the column Material.

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Feb 15, 2012

I have a form with one combo box and text box and buttons. please refer the snapshot with i have attached.I have the following code:

My Stored Procedure for inserting the data:
/*
Name: usp_InsertBranchSetup

[code]......

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Mar 12, 2009

I'm trying to populate a combo box with a dataset, this sort of works, but everything is just appearing on the same line. I think this answer might be to put the dataset into an array, then put the array into the combo box.

...problem is, I'm not sure how to do this! My code thus far is,

Dim usernameList As Array
'Retrieve usernames where player has available status
GetFilteredData()

[Code].....

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Mar 10, 2010

I have a form which has a Combo Box Control. I have selected the drop down style property to DropDown. I have also set the DropDown Width to 250.I have set the auto complete mode to suggest and the auto complete source to listitems.it works absolutely fine when i click on the drop down. but when i type in somethin, the auto complete mode activates a drop down which has a small width.i wanna know how to increase the width of the auto complete drop down via code so that the list items are viewed properly.I am using C#

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Nov 30, 2009

I am trying to create a WPF browser application that allows you to search and display recipes. The combo box presents choices, the Ingredients display in one list box and the "cooking" instructions appear in the other list box. What's happening is the first time you make a selection from the combobox nothing displays, and this could be happening because the first line of code under Selectionchanged clears the List Boxes however, it should be populating those list boxes with content, shouldn't it? Anyway, as you make other selections List boxes 1 & 2 get populated but they do not match what displays in the Combo box, i.e. if you select "Easy Taco Dip" any random recipe might appear in List Boxes 1 & 2.

Option Explicit On
Class Page1
'User Makes a selection from the ComboBox which populates List Boxes 1 & 2

[Code].....

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Oct 8, 2011

I was having a heck of a time populating a gridview combo box.I learned a ton in the last 48 hours but would really like to know the answers to the bottom three questions.You guys are the experts, so I'm hoping you will enlighten meBut the summary of it is below:I was never able to get the ComboBox to bind to the data source. I tried everything until I turned blue. So I went to the basics and coded all the automatic stuff. I'm curious as to why the automatic binding didn't work. Perhaps its because my gridview datasource was LINQ.Here is how I pulled it off. I hope someone down the road benefits from the last 48 hours of my delima:First of all, know that I have two drop down lists on my form, one is the GPField and the other is the BankField. These are already populated DDLs that are static. So I used them to cheat on the values instead of using enums.

Sub fillGPFieldListDDL(ByVal obj As Object)
Dim db As New CompanyDataDataContext
Dim myConn As New Connection With {.ConnCls = ConnCls}

[code].....

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Apr 14, 2010

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AS
SELECT VendorID, CompanyName
FROM Vendors

[code].....

I would select only the vendors that have the RepairType of say Landscaping, so thecboVendor would load now only Vendors with Landscaping instead of all vendors.My question is this: Is this done in SQL in my Stored Procedure or is it done in VB in my functions for my combo boxes. I've never tried this before I am totally lost on it. I have fiddled with the code on both ends but to no avail.

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Aug 19, 2010

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Jun 9, 2011

i've been searching everywhere to try to get this setup. I am running Visual Basic 2008 I have 1 Combo Box that Has 3 Entries, Kyocera>Konica>Toshiba I have a 2nd Combo Box that has entries for each of those manufactors ...Kyocera has 3035,4035,5035....the konica has c250,c352,c452......the Toshiba has c3520, 4520

[Code]...

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Jan 12, 2011

i've been searching everywhere to try to get this setup. I am running Visual Basic 2008 I have 1 Combo Box that Has 3 Entries, Kyocera>Konica>Toshiba I have a 2nd Combo Box that has entries for each of those manufactors...Kyocera has 3035,4035,5035....the konica has c250,c352,c452......the Toshiba has c3520, 4520

I want it so when i click on Kyocera the 2nd combo box only reads 3035,4035,5035 and when i click konica it only reads c250,c352,c452 etc etc

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Oct 14, 2009

I have an employees form with the employees home anddress and work address. I am working with VB

2008 Express.In each address I have a combobox bound to a table of the States.Wn I select any state

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different dataset, another bindingsource, with the same results.

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May 17, 2011

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Jul 15, 2009

I am using the following code for populating the combo boxes in my application. It is really nice. If any one requires, may use this. It takes three parameters. The first, the name of the Combo Box and the second, the SQL Statement to populate the combo box and the third is the number of column to be displayed (from the SQL statement)

[Code]...

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May 4, 2010

How can I set something to the default option when the form is loaded? Meaning...If I want the combo box to have the options of "Hoops,Jams,Dunks", how can I set "Hoops" to be displayed in the combo box before it's clicked?

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Jun 22, 2010

I 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]...

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Jun 6, 2011

can someone please give me basic steps on how to hard code a combo box to display a column from a database?

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Aug 15, 2011

I want to fill data in my combo box using Add range method.

cboFirst.Items.Add("Sunday")
cboFirst.Items.Add("Monday")
cboFirst.Items.Add("Tuesday")

[Code]....

This is how im filling my combo with days. i want to do the Same but by using Add Range Method.

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May 1, 2011

Im trying to pooulate a combo box in vb.net 2008 with information from my access database, but I have no idea how to do thi :S im trying to get it so that the customer names from the database appear in the combo box this is as far as i've gotten for my form load.[code]

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Jun 17, 2010

How to populate a combo box using SQL Data Reader in DAL, BAL and UI atmosphere.  Please find below my code snippets and correct me if I'm wrong anywhere in this code.

'DAL Code

Public Function PopulateComboBox() As SqlDataReader
_cnCon = New SqlConnection(_conString)
_cnCon.Open()

[Code]....

What should be the UI code?  Is the code specified in DAL and BAL is correct?  I knoiw how to fill the combo box with values from SQL Data Reader. But I dont know how this can be done in 3 Tier application. 

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Is there a way to populate a combox with a list of available drive letters? I've tried the following code but could not gt it to wrok.

[Code]...

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Jun 19, 2009

I am using these codes to populate a Combo o a Listview. What i want is to populate de List or a Combo depending a selected value.

cn = New SqlConnection(stringdeconexion)
cn.Open()
Dim sql As String

[Code].....

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Mar 19, 2010

I have the following bit of code which works find but I have been asked to show for the displayvalue the storecode - storename. How can I do this?

sSQL = "SELECT * FROM ST_STORES WHERE ST_RG_CODE = '" & cboRegion.SelectedValue & "' ORDER BY ST_STORENAME"
sqlDSStoresCombo = rppData.tblGetTableData(sSQL, "ST_STORES")

[Code].....

I think I manually need to add the items but don't know how to add an item that has a value and display.

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Aug 26, 2011

i have a combobox and richtextbox, text box. in my rich textbox i have a

Smart BRO 15,SMBRO15
Smart BRO 30,SMBRO30
Smart BRO 50,SMBRO50
Smart BRO 60,SMBRO60
Smart BRO 100,SMBRO100
Smart BRO 115,SMBRO115

i want to split this in to two. i want to load the this in my combobox
ex.

Smart BRO 15
Smart BRO 30
Smart BRO 50

when i select Smart Bro 15 in combobox, the SMBRO15 will show in textbox .

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Mar 20, 2010

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Oct 15, 2011

I am trying to get this Program to print. Most of it is working correctly except for the part of the Fragrance. When it prints it is printing the whole list not what I selected. The exterior and interior are printing correctly and I tried to set the combo box up the same way. I did the debugging and I can see it loop thru the printing process over and over to get all the names in my list. I just don't see why it is doing it or how to stop it.

Public Class CarWash7
'Declaring the Exteroir constants
Const EXTERIOR1_String As String = "Hand Wash"
Const EXTERIOR2_String As String = "Hand Wax"

[code]....

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