Create A Query With Where Statement, Combobox.selectedvalue.tostring()?
May 5, 2010
I am tring to bind a data to listbox with where combobox.selectedvalue. My code is below; I am using data entity in wpf project;
Class Window1
Dim db As New AdvanceEntities
Private Sub Window1_Loaded(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs) Handles MyBase.Loaded[code].....
Also I need to create a query with Join In statement. I need to get two table in one query, they have same values in USERID collumn.
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Jan 26, 2011
am trying to get the following code to work:
Dim testString As String
testString = cbbxStartDt.SelectedValue.ToString("yyyyMMdd")
when doing so the code is being stoped and I get "InvalidCastException" error emssage:
Conversion from string "yyyyMMdd" to type 'Integer' is not valid.
If I do the following, then it works:
Dim testDate As Date
Dim testString As String
testDate = cbbxStartDt.SelectedValue
testString = testDate.ToString("yyyyMMdd")
This, returns the desired value: "20110103"
NB:
cbbxStartDt.SelectedValue.ToString returns: "03/01/2011 00:00:00"
So would it be possible that the problem comes from of the "time bit" : "00:00:00"?if, so is it the parsetime function which would allow to take into account only the time bit value of the combobox?
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Sep 20, 2011
I created a sql query to check if the mobile number is registered or not. If its registered, it will send the new pin code to the customer and if its not, the customer will get a message that "This number is not registered or you are not authorized to this"... something like that... Sending of new code is already working. I just dont know how to make it as conditional statement like PHP. After you query on PHP, you can just set a variable and make a conditional statement..Here is my script in vb.net:
Private Sub CheSMS()
Dim SQLServer As String = My.Settings.SQLServer
Dim conn As SqlConnection[code]......
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Jul 20, 2009
What is the meaning of 'selected value' in combobox properties?
I create a combobox with valuemember = ID (primary key, autonumber) and displaymember = name. How do I get it to select the row with ID of 10, for example?
[code]...
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May 3, 2010
I'm using VB 2008. I'm looking for a way to take the value of the combobox after the user selects the right one. The combobox is databound and in List mode allowing selection of only the items in the box. I allow autocomplete by setting:
AutoCompleteMode = SuggestAppend
AutoCompleteSource=ListItems
So the user can key in the right value and the value narrows down each time. The user can press enter or just click somewhere else to select the value. I need a way to display the value of the combo after the selection is made but not each time a user presses an additional key to narrow down the selection.
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Jul 31, 2009
I would like to assign cboBegCust.SelectedValue to c and cboEndCust.SelectedValue to d
Dim c, d As String
cboBegCust.SelectedValue = "customer"
cboEndCust.SelectedValue = "customer"
[Code]....
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Jan 5, 2012
I bind a datatable to the combobox.DataSource on load. I then give the combobox aisplayMember and a ValueMember (2 different columns out of the datatable). In the SelectedIndexChanged of the combobox I would like to use the SelectedValue property of the combobox, just to test I MsgBox(combobox.SelectedValue) and I get "Argument 'Prompt' cannot be converted to type 'String'." Why isn't it displaying the value?
OnLoad
cbCISoftware.DataSource = dbMaps.Tables("maps")
cbCISoftware.ValueMember = "id"
[code].....
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Apr 19, 2011
Is it possible to BOTH set a comboboxes datasource AND databind the selected value?Ihave 2 comboboxes on a form that I want to populate with data from 1 table,ut I want the actual selected values on each of the comboboxes to come from separate columns n another datasource Right now if one combobox changes, so does the other if that makes sense.
Here's a sample of code:
'Bind DataSource
With cboYields
[code].....
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Jun 2, 2009
I have a question for a combobox in Visual Studio 2008 (VB)If illed a combobox from a table and the use the following statement: Me.cmbProduct.SelectedValue = 1 (or another number)The problem is now that in the form the value is selected but with a blue color. I have on my form several comboboxes but i don't want that blue color.
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May 9, 2011
I have a datagridview combobox column with data bind into it. I would like to set it selectedvalue to a value by default. How can I do it? because it does not have any selectedvalue option.
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Aug 21, 2009
I want to know how can i get selectedvalue of a DataGridViewComboBoxCell
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Sep 27, 2010
I've got a ComboBox with an ItemsSource which I've bound to a List(Of String).What I'd like to do is have the XAML update a String property when the SelectedValue of the ComboBox changes. I've seen a whole bunch of examples for TextBoxes which use
Text="{Binding Path=MyString}"sort of stuff, but I don't really think that'll be the way to go if, in future, I need to change the ItemsSource to a List(Of ObscureObject)...
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Nov 26, 2010
I am trying to create a LINQ query statement that retrieve intersecting data from 3 datatables (dt, dt1, dt2). My first attempt to do so with the following LINQ query statement was successful: [code] However in my design, I would need the LINQ query statement to be dynamically generated, because I want a user to be able to retrieve intersecting data entries from VARIABLE number of datatables. In this case, the first option is not as good as the "INTERSECT" query operator, with which I can just easily connect each SQL query statement with a "INTERSECT" operator. The problem is that my second attempt using the "intersect" operator fails, and after many trials and errors I still can't get it to work. [code]
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Mar 16, 2010
I have a ProbationComboBox with the SelectedValue bound to a RegistrationBindingSource, and the DisplayMember bound to a ProbationBindingSource. [code]
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Apr 12, 2010
In order to fill a datagridview according to the selectedvalue of a combobox I've tried creating a stored procedure. However, as I'm not 100% sure what I'm doing, depending on the WHERE statement at the end of my stored procedure, it either returns everything within the table or nothing at all.This is what's in my class:
Public Function GetAankoopDetails(ByRef DisplayMember As String, ByRef ValueMember As String) As DataTable
DisplayMember = "AankoopDetailsID"
ValueMember = "AankoopDetailsID"[code]....
guess it's down to the WHERE part of the stored procedure, but I need a way to pass the selectedvalue of the combobox into the @AankoopID parameter.
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Mar 23, 2012
I have a WinForms app built with VB.Net in VS 2010, and I'm scratching my head over the following issue.I have a form with a combobox which gets bound to a datasource when the form is loaded:
With Me.cboCompany
.DataBindings.Clear()
.DataSource = Me.m_dsBidResults.Tables("Company")
.ValueMember = "company_id"
[code].....
This seems to work fine, as long as the user doesn't switch focus to some other control and then go back to the combobox. After switching focus, if the user then changes the combobox selection to the first item in the dropdown list (SelectedIndex = 0), the SelectionChangeCommitted event fires, but the SelectedValue remains set to the previously selected value. I've verified this by adding a message box in the above event handler, displaying SelectedIndex and SelectedValue side-by-side.
'add this to SelectionChangeCommitted event handler MsgBox(String.Format("Selected Index: {0}, Selected Value: {1}", cboCompany.SelectedIndex, cboCompany.SelectedValue))
This does NOT happen if the user changes SelectedIndex to anything other than 0; everything behaves as expected. I've verified that the table I'm binding to contains unique values for company_id and company_name.Do I need to use some other event to verify that the SelectedValue has actually changed?
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Sep 29, 2011
WInforms Combobox SelectionChangeCommitted event doesn't always change SelectedValue
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Feb 4, 2009
i want to set the current displayed item in combobox by combobox.selectedvalue = valuehere is the code
Combobox.selectedvalue = value
rivate Function populateComboSupplier(ByVal supplierID As Integer) As Boolean
Dim readSupp As New SupplierCRUD
[code].....
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Jun 11, 2009
Is there any way to get the ComboBox SelectedIndex based on SelectedValue when Datasource property is set with DisplayMember and ValueMember?
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Nov 25, 2008
I have no idea how to do this, but I want to create a [I dont know what it is called] to allow me to convert a class property to another type.The I could use the following w/ the new type:
Dim stringPhoneNo as String = "(111)111-1111" Dim typePhoneNo as PhoneNumber = stringPhoneNo.ToPhoneNumber()
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Dec 16, 2010
1. What's the difference between ToString and ToString()? (i do know that ToString method is to cast numeric values to string but don't know how to get it to work)
2. Why do i need XML comment feature? is it necessary?
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Jun 24, 2011
Ok im trying to do a if statement in Linq and was wondering if it was possible to do something like:
Dim loadFriends = From p In db.UserRelationships Where p.aspnet_User.UserName = User.Identity.Name _
Or p.aspnet_User1.UserName = User.Identity.Name And p.Type = 1 _
Select New With {if p.aspnet_user1.user = "a certan username" then .username = _
p.aspnet_user.username else .username = p.aspnet_user1.Username}
[Code]...
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Nov 30, 2010
In my Form1 i have a datagrid with coulmns: CarName , CarModel , CarColor , CarOwner (there are a lot of data).
I added queries (textboxes that the user writes in text) that can "filter" data when the user want to choose specific CarName or specific CarModel.
textbox1 = CarName
textbox2 = CarModel
textbox3 = CarColor
textbox4 = CarOwner
If the user writes text in TextBox1 then the data shown in the DataGrid is filtered.What if the user want to choose also (!) a carOwner? I know how to use AND statements, but if the user didn't specified a carOwner non of the data is shown although there are this kind of data.
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May 30, 2012
Can you show a coding example that has the "Using" statement with a scalar query?
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Nov 30, 2011
To create a program that asks for input then uses an else statement to create a handling fee balance.
Input: sales record - first name, last name, purchase amount, balance before purchase
Output: report - full name, old balance, purchase amount, handling fee, new balance
Definitions: handling fee is 5% of the old balance if the old balance is less than $1000.00 else it is 2% new balance = old balance + purchase + handling fee
Processing:
Ask for and receive sales information
Calculate new balance
Print output report
End the program when a purchase amount of 9999.99 is entered
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Sep 30, 2009
How can I turn the following query into a LINQ statement? [code]
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Oct 15, 2010
We use LINQ to SQL extensively, and one of the biggest performance pitfalls we've run into is situations where a query can't be converted to SQL, and so an entire database table gets loaded into memory and the query performed by .NET. For example, this query
Dim Foo = (From c in Db.Contacts Select c Where c.ContactID=MyContactID)
translates to a simple SQL query, whereas
Dim Foo = (From c in Db.Contacts Select c Where c.ContactID=SafeInt(MyContactID))
doesn't because SafeInt is our own function and doesn't have a SQL equivalent; so the whole contacts table gets loaded into memory and searched by LINQ to objects, which is vastly slower. With a little experience, we've gotten better at avoiding this kind of situation. But it's not always obvious, and this is the sort of problem that's often not revealed until you're working with a lot of data and things start to slow down. Is there a straightforward way to see - whether in Visual Studio or some other way - how LINQ queries will be handled, other than trial and error?
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Jul 19, 2009
My ComboBox1 have two options, 1 is "R2" another is "R3". I want to put that either the ComboBox1.Text = "R2" or "R3" still will give me Label8.Text = "ok". So i tried put the code like this but it doesn't work.
Code:
If ComboBox1.Text = "R2" or "R3" Then
Label8.Text = "ok"
Else
Label8.Text = "error"
End If
The above code not working But if i took 'or "R3" ' away, it will work.
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Sep 6, 2011
I am getting a syntax error for the code below.I am trying to create a user in the mysql database and add their information to a datagrid control all in one button click using two statements; one to create the actual user, and one to add the user and their additional information to a table on the database and then refresh the datasource which will display the new user's information in the datagrid control.
If anyone knows where i went wrong please feel free to critique my code and let me know; or simply offer more efficient alternatives to what im hoping to achieve.
For those of you that must know, i am running the latest version of MySql server, MySql Workbench, and Visual Basic 2010 Express on a windows 7 based laptop. I'm writing this program in VB.net.
[Code]...
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Feb 13, 2012
It seems like the query builder in vb only allow 1 table to use the INSERT statement, so are there any way add more than 1?
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