Checking Combobox Values In Datagridview?
Nov 4, 2008
I want to check if two combobox values are equal. The comboboxes are in a datagridview.I found you need to use datagridview_EditingControlShowing to add a handler to the comobo boxes for selectedindexchanged. I can do this with this code.
Code:
Private Sub dgridRegisters_EditingControlShowing(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewEditingControlShowingEventArgs) Handles dgridRegisters.EditingControlShowing
Dim combo As ComboBox = CType(e.Control, ComboBox)
[code]....
However, the message box comes up for every combobox in my datagrid when I change the index, not just the cmbPort2. I would like to have something like this...
If cmbPort1.selectedindex == cmbport2.selectedindex then
'do something
endif
..but it doesn't seem possible.
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Jan 22, 2009
How I could go about checking a typed value in a combo to the values in the combo box. I am making a system to select lockerID and Supplier ID I want the user to be able to enter the value in the combo box as well as select the value form the list in the combo box. Here is the code I have been trying.
If cboStockID.Text = "" And cboStockID.Text <> cboStockID.Items.ToString Then
MsgBox("Please enter Stock ID")
Exit Sub
ElseIf cboSupplierID.Text = "" Then
MsgBox("Please Enter Supplier ID")
Exit Sub
End If
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Apr 3, 2009
I have a DataGridView1 populated by sql searches. On the rare occasion that nothing is returned, my app cannot make use of data so I'm trying to check for null values. My code below is not correct because IsDBNull is not a member of the of the DataGridView1.
If DataGridView1.SelectedRows(0).IsDBNull Then
MsgBox("Nothing to display")
Exit Sub
End If
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Jan 27, 2010
How to set values to a predefined combobox column in datagridview i.e., I want to set some values to this column other than binding
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May 28, 2010
I'm trying to create a Windows form application which uses a few data grid views to pull data back from a SQL Server database. I've managed to get the data back okay from the tables but what I want to do is filter that data dynamically based on values input by the user from a combo box and a date time picker. Each of the data grids display production data for a machine but the combo box and date time picker will allow the data to be filtered by shift and date respectively - how to I pass the values of these to the SQL query returning the data?
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Jun 18, 2009
I m filling values in DataGridView using following code [code]Can anybody help me to insert and retreive values from database in datagridview combobox column.
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Jan 6, 2010
I've been trying to fix this for a while now and have yet to find a solution that works, I want it so that when an item is added another of the same name cannot be added. Here's what I have
Dim i As Integer
For i = 0 To ComboBox1.Items.Count() - 1
If ComboBox1.Items.Item(i) = TextBox1.Text Then
'do nothing
Else
[Code]...
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Sep 28, 2009
I can't populate my combobox with ANYTHING I code, and I don't like the click and pull system. it compiles, no exceptions, but it still doesn't populate my combo... this is the code
[Code]...
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May 16, 2011
Can someone tell me why this code works exactley the opposite of the way I thought it should?
[code]...
I have a combobox (cbKeyWords). I want to make sure tbAddEdit.Text does not already exist before I save. To me I should be testing for a False result not True. But the above code, goes to the msgbox if findstringexact=false and saves the data if it's true.
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Aug 7, 2009
why this code works exactley the opposite of the way I thought it should?
[Code]...
I have a combobox (cbKeyWords). I want to make sure tbAddEdit.Text does not already exist before I save. To me I should be testing for a False result not True. But the above code, goes to the msgbox if findstringexact=false and saves the data if it's true. Am I crazy or am I missing something? Shouldn't FindStringExact return false if it's not found?
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Feb 24, 2009
Case: I have one ComboBox which i fill up by using DisplayMember, DataSource with DataTable.
[Code]....
When user key-in in ComboBox (not select from the list), I check with above all possible but still got nothing. According to my knowledge, .Contains(cboStudent.Text) should work. Right?
I out of idea to check this checking.
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Jun 4, 2011
Iam trying to Check Values Of 2 textboxex .. n then Print A certain Amount.
[Code]...
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Jun 23, 2010
I'm trying to make a small program that helps cashiers to practice typing barcode on their machine. Barcode consists 12 numbers, and it can start with 0. Below are the code I worked on so far.
[Code]...
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Oct 18, 2011
I have 14 values, that change constantly. I need to know how to check each value against each other to see if they are within 250 of each other. [code] I want these two values in the listbox to blink red in the list box. but i always want each value to check every value in the list box. i dont even know where to start short of programming each possibilty with a if than statement and that would take forever
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Jan 14, 2010
Im trying to check to see if a value of a label changes over time. however I can't seem to get it right.
dim val1 as string
dim val2 as string
private sub form1_load()
dim val1 = label1.text
end sub
[Code]...
problem is it will only check it once after ten seconds when the timer is set to 10 seconds i need to to check it every 10 seconds becuase these values display altitude, and if the server freezes the altitudes dont change. I need to make sure they are updated and not frozen.
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Mar 4, 2009
I have a form where when the user clicks the button the values of the form are stored in SQL database. I want to write code in order to check if a specific textbox-value already exist in the database table (in the field "Name"). I 've tried writing something but it doesn't work properly.
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Aug 5, 2009
am new to VB.NET and i was wondering if anyone here knows how to check for duplicate values in strings?
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Jun 10, 2010
I'm basically putting some validation logic around an undo button on my form and i'd like to check whether any fields on the form have had their values changed so i can ask the question "abandon changes?". This seems like something pretty standard to me but I can not see how to check whether a value has had its contents changed (without recording a before value and comparing it to the after value which for large forms would be quite horrendous to code).
In the language i used to use we used to walk the object tree (so we dont have to specify each object individually like text box, combo box etc) and check any object that have value-changed = yes to indicate the validation was required.
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Jan 14, 2010
I have tried to solve this myself and I know I am probably doing something really silly here what I have is two different registry values that control what is displayed in the combobox on my form RegistryKey1 has the following values:0,1 or it does not existRegistryKey2 has the following values2,3, or 4 the combobox has the following values 0,1,2,3 However here is the problem if the RegistryKey2 is 2 then it further has to be checked if RegistryKey1 is either 0,1 or does not exist
if it is 1 then the selectedindex = 0
if it is 0 or does not exist then the selectedindex = 1
if RegistryKey2 is 3 then the selectedindex = 2
[code].....
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Mar 30, 2010
as title says. and if it has the same values, delete one of them and add (2)
so itll be like: - before the filter:
[Code]....
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Apr 14, 2011
I have a form where two fields on the first page of the form make up the primary key. I want to check for duplicate values before attempting to insert the record, since I don't want the user to go all the way through the form only to find out they can't submit it. So I'm trying to check for duplicate values when the user tries to go to the next page of the form. I wasn't quite sure how to do it, and sure enough I'm getting an error. ("Object reference not set to an instance of an object.") The problem is apparently in my if statement, "If myValue.Length > 0 Then", but I'm not sure what needs to be in place of that.
Protected Sub CustomValidator1_ServerValidate(ByVal source As Object, ByVal args As System.Web.UI.WebControls.ServerValidateEventArgs) Handles CustomValidator1.ServerValidate
'get values
[code].....
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Feb 20, 2009
I have declared a class in VB.NET using VS2K5 with some shared variables and made that class a dllI made use of that dll in another project and tried to make use of those variables. Even though I can able to make use of them, Im unable to view the values of those variables like the values of normal variables when Im debugging. Is there any way that I can watch the values of those shared variables during debugging.
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Jun 24, 2009
I have filled a DVG with information and added another column to index(8) pragmatically Now i want to create a combobox with values depending on values in other cells on the same row so each row will have a combo box with different selections. below i have placed the code and hoped someone would have some input on how to approach this. i have tried datagridviewcolumn but that fills every row with the same information regaurdless of a if statement
[Code]...
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Dec 26, 2011
Basically I have a form which has 2 drop downs. In the 1st drop down I am selecting City category. When the city is selected I want to update the 2nd drop down values in correspondence to 1st value choosen in 1st drop down. I have done like this,This adds the value in the 1st Drop Down:
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
Dim s As String = "connection String"
sqlconn = New SqlConnection(s)
[code]....
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Oct 31, 2011
I've never really used the Check List Box in the past, however, for the recent program I am developing, I am using this control rather than individual check boxes scattered across the form.Anyway, I want to be able to program through code which items get checked in this checked list box. Specifically, I have a variable that contains the text of each check box that I want checked.With a normal check box, I can simply say:
Dim strNames As String
strNames = "John Doe, Mark Johnson, Mike Brown, Cindy Smith"
If strNames.ToString.Contains("Mike Brown") Then[code]....
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May 2, 2012
DataGridView TIPs has TextBoxes and ComboBoxes in it and the data comes from an SQL table. I see how to get or set the cell values that come from the ComboBoxes using Item, but how do I access the actual ComboBox events and properties?
[Code]...
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Mar 30, 2010
1. I can check a DataSet for errors with DataSet.HasErrors and I wonder how to check the same thing for a DataGridView.
2. Coming from MS Access I am not used to batch editing a dataset via a datagridview for instance. Think of a multi user Windows forms application / SQL Server setup. So I wonder if it's ok to just save the data after a row has changed, edited or deleted and not wait till all modification are done and then do a batch update?
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Feb 9, 2011
get cell value when checking on datagridview vb.net.
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May 7, 2012
I have an unbound Datagridview which gets its data from an array from an Excel sheet. I give the user the chance to amend this data in a Datagridview. I then need to know if the user has changed this data before processing it further. I have in vain, tried to use IsCurrentRowDirty, IsCurrentCellDirty, looping through DGV matrix etc. It seems that because the DGV is not bound to a dataset then the normal properties like HasChanged and the 2 above don't seem to work. Here is my attempted code which is not working:
Dim DGRow As DataGridViewRow
Dim DGCell As DataGridViewCell
For Each DGRow In DGV_ReviewDetails.Rows
[code]....
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Jan 28, 2011
So I'm writing the equality operator overload (Operator =())for a custom object, and the resulting mess of If conditionals is just an eyesore. But so far, it seems like the only sane way to check the values to as to match the specific behavior of this object.
The rules are:Num1 is required, period, and both the left and right operands and must be equal for True. Else, False.Num2 is optional, but if specified, must be present for both the left and right operands, and must be equal for True. Else, False.Num3 is optional, but can only be specified if Num2 is also present. Else, False.Num3, if specified, must be present for both the left and right operands, and must be equal for True. Else, False.
[Code]..
I also know that I could cache elements of the checks into booleans and then use those to reduce the amount of text. But that seems like a waste of cycles just for code readability. So I wanted to know if the SO community had better thoughts on reorganizing it, just in case I'm being too verbose with my checks.
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