I've used VB to connect to Excel and get the titles of the different columns in a spreadsheet. These then display in a drop down combo box for the user to choose from. I'm getting lots of empty values in my combo box because not all the columns in Excel have titles. How would I go about telling it not to display them?
Excuse the easy question but I've only started learning to code a week ago.
let me explain further i have table account. in the table are 2 columns namely account_type,Account_name.So on the forms, i want the combo to show the 2 columns even though ony one column would be saved. Am able to do this in access as attached.[code]...
View 5 RepliesThe combobox is bound via binding source to a table. How can I display the list of look up options while having the first option say [None} and if selected, clears the value from the list.
View 2 RepliesThis combo box is databound to a SQL backend, so when it is filled it has a blank at the top of the list. I am assuming this is added because of the NULL at the bottom of the SQL table. Is there a way to remove this entry?
I have tried the following:
.items.remove("") ' does not work, i added this after the population command
.items.removeAt(0) ' This gave me an exception stating that it could not be used because the datasource was used This is the code i use to fill the combobox on form load:
With ManufacturerComboBox
.DisplayMember = "Manufacturer"
.ValueMember = "ManufacturerID"
[Code].....
I've inherited a form that has a DataGridView that is bound to a dataadapter and it is connected to a binding source. Within the DataGridView is a combo box that is bound to its own bindingsource which basically just calls a stored proc to bring back the possible values for the dropdown combo control
With a blank new row and sometimes even with an existing row, this value for the combo box can be NULL which is a legitimate value for it if no value selected. Problem is everything is so tightly bound if the user mistakinly clicks the dropdown then a value is populated and there's no way to get back to NULL
I've tried to catch the mousecelldown event and others to try to catch this before a value is selected but the Cancel=True doesn't work - I can catch the event but don't know how to return the cell to unclicked or reset it to NULL or pre selected value if NULL I know how to at a new row with the datatable and then set the combo datasource to it and I have my null blank value but with a tightly bound control how do I add this row?
How to use a databound combo box to display one field in the drop down, and another as the combo box text on roll up? Using VS 2005... For example, I have a datatable that has 2 fields. One called "ShortDesc" and one called "LongDesc". I want to be able to see the "LongDesc" column values in the drop down on the combo box. When I make a selection, I want the text in the combo box to read the corresponding "ShortDesc" value.
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I've got some code like the following. I want it so that when I chose an item in 'select 1' it changes the in the second combo box but I'm not sure of the best way to go about it. Does it have to be AJax or can it be done with just Javascript?
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
[code].....
In my detail form I would like to diaplay datetimepicker field as blank in case when user open new record. Is it possible to display blank datetimepicker? How it to do?
View 2 Repliesi have a small program to run through a log file and extract data from it which works, but the array it puts out has a blank value before and after the actual data values, and it confuses me why that happens, i dont really understand why and was hoping someone here knew! the parts of the code related are below
Dim rgxSessionStart As New Regex("^Session Start: [A-Z][a-z][a-z] ([A-Z][a-z][a-z]) (dd) dd:dd:dd (dddd)")
Dim substrings() As String
substrings = rgxSessionStart.Split(LineIn)
a sample line that it would match is Session Start: Sun Aug 22 00:00:00 2010 which WORKS, but the values of the array are "","Aug","22","2010","". so its not a critical problem because i can still get the data from it, but those blank values are puzzling and i feel like maybe im doing something wrong with the syntax or method for them to be there.
When i parse some html and get the fields i need using regex, the first 4 fields returned are fields i don't need, so essentially i need all fields returned after the 4th one.
vb.net '// First piece of data we want...
Dim stringID As New Regex("(?<=><optionvalue="").*?(?="">)", _
RegexOptions.IgnoreCase Or RegexOptions.Singleline)
Dim stringsMatched As MatchCollection = stringID.Matches(stringClean)
[CODE]...
Is there a way i can blank out the first 4 fields returned?
How to display datagridview with default six blank rows and two columns.v
View 1 RepliesI am using VB.net 2010 to generate a letter from a Word 2002 template. The template has MailMerge bookmarks where the database values will be displayed (for example the letter receiving company's address). Currently I have:
«Company Contact»
«Company Name»
«Address1»
[Code].....
If "Address2" value is blank, then don't display the bookmark in the letter output (hence avoid displaying a blank line)
I am using VB.net 2010 to generate a letter from a Word 2002 template. The template has MailMerge bookmarks where the database values will be displayed (for example the letter receiving company's address). Currently I have:
[Code]...
How to display datagridview with default six blank rows and two columns.
View 4 Replies1.In a bank fixed deposit rates are given below.
PeriodRate
6 months8%
12 months10%
24 months12%
a.Design Suitable user interface in windows application in VB.NET to calculate interest at maturity. Use Radio buttons for period.
b.Calculate interest at maturity.
c.Calculate total amount at maturity
d.Add a clear button to clear the exiting contents
e.Display an error message when deposited amount is blank
I want to Add Values to my combobox in Datareader.This is my code,
Command = New MySqlCommand("SELECT * FROM tableName WHERE id = '" & id & "')
Command.CommandTimeout = 30
dr = Command.ExecuteReader()
If Reader.HasRows = True Then
While Reader.Read()
cmb.Items(dr(0))
End While
End If
I have tried adding it this way but it is not working.
I am familiar with getting a selected value from a combo box but what about if you wanted to get all the values from a combo box then store those values in an array or list. The combo box would be data bound to a source and have an ID as the value member. So How would I get all the values from the combo box.
View 6 RepliesI have two comboboxes in my form (cbAdresse & cbVerwaltung). Choosing the value in the first combo, i get the value from the table into the textbox txtAdID. Now i try to use the value in the txtAdID as the parameter for the SQL command selecting the values from the table (tblVerwaltung). These values must be added to the second combo (cbVerwaltung). So i use the following code for the SQL Compact Client:[code]Using this code i get the following value in my combo cbVerwaltung: "System.Data.DataViewManagerListItemTypeDescriptor".[code]
View 3 RepliesI have a combo box that is tied to a binding source that loads a list of users from a table. Currently the list of users is a List of String object type. When a user selects one of the users from the drop down, a list is filtered down based on the selection. To do that I currently have to requery the User Table to grab the UserID column of the user selected, which seems a bit inefficient to me.
Is there a way that I can assign a custom object with two properties (UserName, UserID) and have only the User Name is displayed and when I have to filter the list, I already have the UserID, so there is no need to requery the database.
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I am working with Vb.net and have a form with a combo Box. On load the form is loaded with one of the following details depending on what is stored in the database; Cancelled, Processed and Failed.
TxtColStage.Items.Add("Cancelled")
TxtColStage.Items.Add("Processed")
TxtColStage.Items.Add("Failed")
Then I have an update button and when the user drops down the list he/she can select between Cancelled/Processed/Failed. I want to be able to grey out or disable Processed and Failed, so that when the user updates the field he/she can ONLY update with the Cancelled option ONLY.
how can i fill two value in combo box . first one for visible and second one for backend(key column) like in vb (Item data)[code]
View 1 RepliesI am trying to get duplicate values from dgv into a combo:
[Code]...
Am using a combo box with no of phone numbers .I want to get the phone no one by one in a variable. Now am using the below code to get the combobox values. But still now am getting the following error message System.Data.DataRowView. Please help me to fix this error. am new for vb.net.[code]
View 1 RepliesI have a enum,
[Code]...
I need put the "text" value of all the above Enum values in to a combo box, how do i do it?
I have A combo box with 5 values in: How would i save all 5 of those values to my file?sw.WriteLine(CustomerIDTextBox.Text + ":" + CustomerFirstNameTextBox.Text + ":" + what????? Once these values are saved how would i go about retreiving them from the file and displaying them back into the Combo box?
View 3 RepliesI'm using the combo box control in VB.It is not bound to a data source.Visual Studio gave me a text box to enter the values for the combo box.When I run the program, there is a blank value?How do I eliminate this blank (or null) combo value? My combo box is a required field.
For example I entered
Option 1
Option 2
Option 3
When the program is ran, the combo box has <blank> (which is selected) Option 1
[Code]...
I am working with Vb.net and have a form with a combo Box. On load the form is loaded with one of the following details depending on what is stored in the database; Cancelled, Processed and Failed.
Code:
TxtColStage.Items.Add("Cancelled")
TxtColStage.Items.Add("Processed")
TxtColStage.Items.Add("Failed")
Then I have an update button and when the user drops down the list he/she can select between Cancelled/Processed/Failed. I want to be able to grey out or disable Processed and Failed, so that when the user updates the field he/she can ONLY update with the Cancelled option ONLY.
I have a form that queries a database into a dataset then sets textboxes to values from the query. I have a status field I want to be able to control so I created a combo box with typed in values(Active, Inactive, Missing, Broken,Calibration). The purpose of this form is to view the current information on the item and edit if need be. I want to display the current status in the combo box. I can't get the combo box to display the value from the query. How do I do that.
View 6 RepliesWhen insert in the first char then it display the related item the combo box
View 9 RepliesI have a combobox with a list of items in it. Now when the user enters a character I want the combox show the list of items that starts with the specified character.
View 7 Replies