DataGridView ComboBoxColumn List?
Jul 12, 2009
I am populating a DataGridView from a DataTable with a DataAdapter (VB 2008 Express, SQL 2008 Express). The dgv is for editing (with SqlCommandBuilder) a SQL table. I have added a ComboBoxColumn ("Type"), with a list, and removed the column from dgv ("Reason") who's index it replaces. What I can't figure out is the binding(?) to have the selected text displayed the same value as that from SQL table that is being edited. The ComboBox displays an index of -1, I need the selected text to be the data from row and field which is to be edited. The list is constant. Code so far is below:
Public Sub LoadDgvComps()
Dim myDA As SqlDataAdapter
Dim dsComps As DataSet[code]......
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Jan 8, 2010
I have a combobox column in a DatagridView, I was able to bind the column to some values from a database using:
Dim myComboBox = New DataGridViewComboBoxColumn()
myComboBox.HeaderText = "Header name"
imyComboBox.DataSource = myDataTable
[code].....
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Aug 11, 2010
I have a databound combo box column. When a value in another field starts with an 8, I want to make the combo box read-only and turn the background gray so the user knows it is read-only.
Here is the code I'm using, where am I going wrong? It doesn't change the backcolor to gray.
Private Sub dgvTest_CellFormatting(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewCellFormattingEventArgs) Handles dgvTest.CellFormatting
[Code]....
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Jun 7, 2009
Is it possible to attach a context menu to a oomboxcolumn in a DataGridView? That is I want the context menu to display after the user chooses an item in the combox.
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Jun 21, 2010
I use:
CODE:
I want to show with the DataGridViewComboBoxColumn two fields from groups table . But i want only link field "articlenb" to column, but a want o show filed "Articlenb" and I want to show fields "groupnb" and "groupdef"
My question is how do this?
Here is my code for ComboBoxColumn, with one field from groups table.
This works well!
CODE:
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Jan 14, 2011
i am using a Datagridview on my form. It get's it's datasource from a dataset: grd.datasource=set_temp After that I add ComboboxColumns manually. At the end I loop columns and set values into that cells from the comboboxcolumns. Works perfect so far. Now I click on a header and the sorting is changed, and then the cells from the comboboxcolumns all lose their values, they are all empty.
Why and what do I do to avoid that? Or must i refill those manual Values after sorting?
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May 24, 2011
I have a child form in an MDI application with a datagridview comboboxcolumn. I'm filling it with string values. When I load the form independently of the parent, I am able to set values for the comboboxcells. But when the form is loaded as part of the MDi application, with the same exact code, the cells are empty.
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Mar 29, 2011
I have a child form in an MDI application with a datagridview comboboxcolumn. I'm filling it with string values. When I load the form independently of the parent, I am able to set values for the comboboxcells. But when the form is loaded as part of the MDi application, with the same exact code, the cells are empty. I've spent hours trying to figure out why this is happening but have no idea.
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Jan 24, 2012
I have a GUI which allows the user to select a report to view/edit. When the user selects a report, it shows the Items in the report. The Item has many properties - most of which are binding properly. One of the properties is Owner, and this is bound to a ComboBoxColumn.
Report
Items
Owner
I have done something very similar to this a few times and had no problems when I set the DataPropertyName, DataSource, ValueMember, and DisplayMember. The only difference is that this time instead of the Item type having an OwnderID it actually has an instance of the Owner object.giving the items bound in the list a self-referencing property that allows them to return themselves for the purposes of setting the ValueMember.However, When I bind it this way:
OwnerColumn.DataPropertyName = "Owner"
OwnerColumn.DataSource = ownersBindingSource1
OwnerColumn.ValueMember = "Self"
OwnerColumn.DisplayMember = "OwnerName"
I get a lot of errors like: Unable to cast object of type 'System.String' to type 'Owner'.
and:
The following exception occurred in the DataGridView:
System.ArgumentException: DataGridViewComboBoxCell value is not valid.To replace this default dialog please handle the DataError event.I was able to get around some of these errors by binding it like this:
OwnerColumn.DataPropertyName = "Owner"
OwnerColumn.DataSource = ownersBindingSource1
and also by making the ToString function on the Owner display the OwnerName property. This seems pretty hacky though - and I think I'm misunderstanding something fundamental as it still does not function properly.
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Sep 22, 2010
With the two lists (t1s and t2s), I want to display t1s in a DataGridView, and in one column show the T2 property as a comboBox column, which dropdown will show the t2s list such that a new list instance can be selected. T2 has a Name property that should be used for displaying it in the comboBoxColumn.
I'm able to display the dropdown, but remaining a few problems:
1. How to display the correct comboBox "selection" on "load"?
2. How to change the T2 child object instance when combobox selection is made?
3. This is a really basic problem, which suddenly happened and I just couldn't understand what I have changed; The code marked BLUE now just shows empty cells.. While the AutoGenerated columns do show values.. Shouldn't those "manual" columns work?
[Code]...
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Nov 25, 2009
I have a comboboxcolumn in a DataGridView. I have loaded int with string data that appears in the dropdown box. I have added an event to it for an SelectedIndexChanged. What I am trying to do is autosize the width of the cell in the column based on the string chosen in the drop-down box within this SelectedIndexChanged event. This seems to work but it does not work off the initial selection change. When I select the desired string in the dropdown box the width of the cell does not autosize. I am not sure why.
I was trying to get around this by wrapping an IF stmt around the autosize logic by saying if cell value = "" then cell.width = Max Width of all loaded strings/ However, I can't figure out how to access the string array loaded into the dropdown list
[Code]....
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Dec 16, 2009
I am using VB 2005 professional and SQL Server 2005 express edition.
For the last two weeks I have been trying to have a datagridview control on a form that will have datasource from a dataset with two tables that are related. I want child the column to be a ComboBoxColumn where userts can select options and update the other data(from the other table).
I have two tables in an sql server 2005 database named computers:-
computers
locations
Table computers looks like thisID is the primary key column)
ID Location
Computer139
Computer240
[Code].....
With the location column being a ComboBoxColumn so that when a user enters a new ID say Computer5,they have a choice of a dropdownmenu for the Location column. In the database table computers the item should be saved as well as the index value(to correspond to the LocationID).
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Jul 27, 2010
easy way to simply load the data from database into a datagridview with one of the columns being a comboboxcolumn. Apparently there is no selectedvalue, selectedindex or value as in a combobox to return the combobox value. What I need is to verify if the database value is 'true' and if it is then I need to set the comboboxcolumn with a specific value.
Ex:
if ds.tables(0).rows(0)("flag") = "true" then
datagridcolumn.selectedvalue = 1
else
datagridcolumn.selectedvalue = 0
end if
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Nov 27, 2009
I'm pretty new to VB.Net programming, but have already been able to figure out many things using this forum, but also via the many other forums on the internet.I'm currently stuck with a question though regarding getting the clicked value in a datagridview comboboxcolumn.When I use _Selected IndexChanged and then check the current cells value, what I get is the value before I clicked the new one in the comboboxcolumn.When I use _CellEditFinished, I can get the new value, but only after I selected another cell, or changed focus to another object.How do I get the new value from a DataGridViews ComboBoxColumn the moment I clicked it in the pulldown menu from the ComboBoxColumn?
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Apr 17, 2010
I've done this, the way i've always done it .. 100's of times before.. and now on this one form... bombs out... and will not linkup ...I have a DGV with 101 columns, and on this form only one of the coulmns requires a ComboBox (Drop Down List). It's the run's Status, and is one of three values..Pending, Running, Complete... so i'm loading the Combobox Datasource with a List (Of {Object}), like i do on several other DGVCombo Boxes within the same project.. (other forms)
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Nov 30, 2011
I have a grid populated from a list. Now there are particular properties in this list that I don't want displayed on the grid. It displays all of the columns perfectly, then adds 2 others I didn't originally have on the grid when I constructed it in designer mode. I have removed them after the binding with DataGridView.Columns.Remove("ColumName"). However, is there a way to prevent it from adding these beforehand, or is this the only way?
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Aug 31, 2009
datagridview1.rows.clear()
And this one
me.datagridview.rows.clear()
It says I cannot clear the datagridview list.
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Nov 30, 2011
I am basically recreating task manager and process explorer to my needs. I am getting the processes as needed for now into the datagridview by using a timer. However, I can't seem to figure out how to "remove" any copies as it constantly re-adds the processes on each timer interval.I basically want to "refresh" the processes in the datagridview, and "update" any information within the rows.[code]
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Jan 4, 2012
I have a program where i let the user dynamically add DataGridViews to the interface, those are also added to a list for easy management. All of the DataGridViews have their own datasources. I am using a Databinding source to get different DataGridViewTextBoxColumns to add.
The problem is the following: When the user adds the first table the following code runs:
dataGridList(dataGridList.Count -1).Clear()
dataGridList(dataGridList.Count -1).Add(NameDataGridViewTextBoxColumn)
No problem there and the right data is displayed, but when the user adds the second table i get an exception thrown:
"Provided column already belongs to the datagrid view"
I think this is strange since i access different DataGridView's right?
The point of all of this is to be able to view different columns in all the DataGridViews depending on the users choices.
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Jul 16, 2009
how i can bring the data like list box in datagridview column.
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Aug 19, 2011
I have the following code which works fine with a datagridview..
Dim conn As SqlConnection = GetDbConnection()
Dim conn1 As SqlConnection = GetDbConnection()
Dim query As String
[code]....
Now, am working with a listview called LsvColRequestListview please how can I update the code to acknowledge the listview value...
I have on the List view
10 20 30
meaning prac_no = 10
prac_no = 20
prac_no = 30
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May 27, 2009
I have a DataGridView and i want to build a string list from that. i have tried many way wothout a good result.
I need to build this list of string and after that to make a single string to send it via e-mail
[Code]...
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Jan 18, 2010
I am trying to bind a list of a structure to my datagridview. But I just get a load of empty rows (I created the columns manually).
Public Sub New()
' This call is required by the Windows Form Designer.
InitializeComponent()
[Code]....
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May 5, 2010
I am trying to place a datagridview's row information (each cell) into a list.
I've tried this:
Dim dgvRow As DataGridViewRow=myFrm.myDGV.Rows(index)
and it returns the count of my cells in the row, so I know it's getting the right row but how would I get the info from each of those cells and place them in a list?
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Apr 25, 2012
I have created a database with a couple of records to get started, also I have attemted to implement the database in my forms. I want to add, delete, edit and save new records into the database so when I use it or re open the program the entered data will still be there. Also, after I have implemented these things, I would like to be able to import data from the database into textfields or comboboxes. I have a basic email client and I would like to import these contacts into the datafields. However, I will be trying to achieve that later.I am trying not to use the data connection wizards as I am learning the code as I go along. I have been reading up on databases for about 2 days not and i'm still struggling.This is to add contacts with the fields.I have 7 labels with text boxes, using the naming convention lblFName or txtFName etc;
-First Name,
-Last Name,
-Nickname,
-Email,
-Phone number,
-Address and
-DOB
I have 4 buttons;
-Add record
-Delete record
-Save record
-Next record
-Previous record
I don't know whether to use datagridview, listboxes or something else to display the records.This is to give you an idea of what I have done so far.However, I cannot find a way; despite my best efforts over the last 5 days to link the database that is located in the same folder as my program.If anyone could point me in the right direction on how to code this into my program, or post some links of which I can read, learn and understand the code.
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Oct 10, 2009
I have a List(of Class) where the class has two properties. One is a string and the other is a List(of String). I want to view this in a DataGridView and show the list property in a combobox. This is the basic structure of the grid, can someone tell me how I assign the "Files" property to the combobox? [code]
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Jun 6, 2012
I was thinking of using a dropdownlist showing all names. But is it possible to have a dropdownlist showing a datagridview showing more details such as names, address and telephne number of the person?
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Feb 4, 2011
I have a datagridview with its datasource binded to a List(Of T). Now i would like to sort on any of the columns.My code:
'Database access : items = List(BlogPost)
dgBlogPosts.DataSource = items
'My BlogPost Class
Public Class BlogPost
[Code]...
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Feb 6, 2009
I am relatively new to C# and winforms, although I have been using Java for years, so forgive me if im asking something relatively straightforward!I have a DataGridView, it needs to update regularly so I wish to provide a Collection of objects as its DataSource and NOT a database table.So far I have a List<MyObject> which will be constantly updated via a BackgroundWorker thread. I want my DataGridView to update when a change has been made to the List i.e. if the objects are resorted, added to or deleted from etc.Currently my DataGridView only displays the first object I add to the List, if I add more the DataGridView doesn't update to display the new objects added.This is a basic overview of how im coding it:
private List<MyObject> myList= new List<MyObject>();
myDataGridView.DataSource = myList;
Then my BackgroundWorker thread updates the list, e.g.
[code].....
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Nov 1, 2011
What I am trying to do is to instantly apply a filter to a large list of data such that the list is updated almost immediately regardless of the number of items in the list. I have this working using a listview right now but it is far from instant, a list of 5000 items takes over a minute to get through. What I do currently is to maintain a cache of my data that my listview entries are based on. When the user selects a filter I parse this data one item at a time and determine if each item should still be displayed in the listview, if not I remove it. The complexity of determining whether or not a data entry meets the filter requirements is O(1), but just getting through each element in a loop takes significant time, and so does updating the list view graphically at the end of the process.
I have considered using a datagridview instead, using a database connection. I have never done this before and my main question here is whether this would allow me to do what I have described. With the database I could form an SQL query to return only the items that meet the new filter requirements... but would the data in the form update immediately, or would there still be significant delay?
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