Regarding DataGridView Visible Columns Count?
Aug 3, 2009
i have a DataGridView bound to a table that has 22 fields in it. In the datagridview columns, the first 2 have the visible property set to false and the last 7 also set to false. This works since there are 13 columns displayed in the datagridview when the program runs. Here's where my issue come in. When I do the following, Console.WriteLine("Column count = " & DataGridView1.Columns.Count.ToString()), I get the expected "Column count = 22 in the output. However, when I do Console.WriteLine("Visible = " & DataGridView1.Columns.GetColumnCount(DataGridViewElementStates.Visible)), I get 20 instead of the expected 13 that actually have the property set to visible.
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Oct 6, 2010
Declare some class level variables that will keep track of the sums for each column. For example:
[Code]....
During the RowDataBound event, retrieve the data from each column and add it to the appropriate sum. I'm not sure if you are developing an ASP.NET application or a Win-forms desktop application so I cannot help you any further at this point. What have you tried so far to solve the problem?
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Jun 29, 2011
I have the below Linq query that is returning the data but I need to aggregate the columns to group on the Period and Sum the Count columns. How do I go about doing this?
LINQ
from t In tblTimes
join h In tblEngineeringDashboard_CADMachinesCounts on t.ID Equals h.TimeID
Order By t.Period
[code].....
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Apr 25, 2011
I was trying back yesterday to count the visible lines in a textbox, which is multiline, and found this article: [URL] but... it didn't work... The code worked fine, but sometimes it returned like, 5 or 4, when I counted the visible lines, and there was 2.. If you know what's wrong/have any answer for this it would be nice :)
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Feb 13, 2011
Is there a way to size the columns so that all the information in the cell is visible. the database is in vb 2010 express
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Feb 19, 2009
Textboxes are arranged in a 5x5 matrix and each text box is only restricted to either a "1" or "0" input. I need help in the code that will count all 1's in each row and column. Since this is a 5x5 arrangement, there are 5 rows and 5 columns each. I am actually making a simulation of a VRC/LRC program. There will be 2 buttons namely "Even/Odd Parity". If user presses Even parity and the number of 1's in that specific row/column is Even, the result will be a 0,If odd the result is 1. There is a result textbox at the end of each row/column.
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Oct 26, 2011
I'm using VB.net 2005. I have working programs that I populate DataGridViews with something like the following:
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Jan 20, 2011
im wondering which way may be better to find out the number of cols for a row:
1) row.Table.Columns then count
2) row.ItemArray then count
3) am i missing something, is there a much more "direct" way to do it?
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Mar 13, 2009
I am currently using a recursive search to get all of the files in a directory as well as in all subdirectories of that directory. At the moment (as a temporary solution to make sure the script worked) I have all files with their respective directories listed in a listview (2 separate columns).
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Jul 30, 2009
I have several problems with rows in a DataGridView. Background information: The DataGridView (DataGridViewCalib) is in one TabPage of a TabControl, some columns of the DataGridView are automatically DataGridViewCheckBoxColumn as the DataSource have some colums which are Boolean. This is a Windows Form written in VB.Net with Visual Studio 2008. The user loads an input data file.
The problems:
1) At first arrival in the TabPage, ShowDataGridViewCalib (code below) is called. All rows are then shown in the DataGridView, despite the code saying that some rows should not be visible. Breakpoints in the code show that the code do arrive at the Rows.Visible = False events. Despite all rows beeing shown a Watch in the debugger shows that:
[code]...
There are two alternative ways of handling the rows in the code. The first attempt (commented away here) is probably the "nicest".
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May 11, 2009
I am trying to figure the best way to programmatically re-size table column headers in ReportViewer.Basically, my current resolution is the following: ColumnWidth = Header Caption_CharacterCount * 0.32...Where 0.32 is an estimated width of a typical character using my current font size.The issue is that the width leaves a lot of whitespace for longer captions.The more characters a caption has, the more whitespace I end up with.The issue with estimating this way is that not all characters are the same width. A good example would the the "I" character, which takes up less screen width than the rest of the alphabet.[code]
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Sep 1, 2011
im usinf Gembox to read Excel files.I'm copying the fields to a datatable, so i have to add the columns to the datatable first.
Therefor im using this code:
For i As Integer = 0 To objWorksheet.Columns.Count - 1
objDataTable.Columns.Add(i, GetType(ExcelCell))
Next
But objWorksheet.Columns.Count is 0 even if theres data in 4 columns.
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Aug 29, 2010
In the previous reply, you showed how to open a CSV in Excel. How does one determine the number of rows and columns that were imported?
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May 27, 2012
I am populating a datagridview with data from a table and some unbound columns This is a large table and I want the form to fill the screen and the datagridview to fill the top half of the form. To do this, I have put a panel on the top and a panel at the bottom.I have anchored the dgv to the top left and docked it to the toplumnHeaderHeightSize is AutoSizehe issue is that the ColumnHeaders are not visible unless I click on the restore down button on the top right part of the screen
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Jun 11, 2009
i have datagridview and datasource is dataset. Everything is fine no problem.
It has 3 coloumns, ID, Name, City. ID is PK
Now I have rowfilter on dataset like this
dataset.tables(0).defaultview.rowfilter = "Name Like '" + txtName.text + "%'"
everything is fine till here. it show selected records.
now, i have another text box on form which ask for id and search id in datagrid like this
dim dras datarow = dataset.tables(0).findbyid(cint(txtId.text)
in above case if id found then it will dr with row. which is fine...
the question is how i can find if current row is in list or not because of filter on dataset.table
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Dec 24, 2010
I just pasted a datagridview on the form , added a button and named its text as "ADD". I even changed the UseColumnTextForButton
property to true . But when the form loads the button text is not displaying .
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Nov 30, 2010
I'm trying to focus input and fire the editing event on each new row that I add to a DataGridView in my form.[code]...
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Jan 11, 2011
I have a class that inherits from DataGridView. However, when I create a new instance, set the position, width and height and then run the project, the datagridview is not rendered.Is there something else I need to do the make the datagridview become visible?
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Apr 8, 2011
I do not know what this term in the computer. but I try to send pictures, might be able to know what I mean.I want to eliminate the columns that I marked in the picture.how? what can be set for width 0 ?
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Jun 19, 2010
A DataGridView in my VB.NET 2008 program contains over 15,000 rows. I loop through the rows, totalling groups of rows and appending 'total rows' and one 'Final total row' to the DataGridView. That works fine. I want to initially hide all rows except for the total rows, giving the user the option to show all 'detail' rows. If i place the statement << dgvTitleCounts.Rows(intRow).Visible = False >> in the loop, execution time increases by three minutes and that is unacceptable.
I see two options: (1) find a faster way of making all rows invisible; and (2) place the total rows in a separate DataSet and bound DataGridView.
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Sep 11, 2010
I have a access table column ("d") and rows with value Datetime. How can I ..... when form load make the datetime now ..visible. What is the code for making the rows with datetime value now start with index 0.
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Oct 27, 2011
i have a datagridview which am display some data and i have also cell formating event which according to that data that are populate am changing the row format and one of my columns are of type image and am load an image depending on the row values.day by day the data in are become larger and when am trying to load that data to the datagridview is taking much time in order to display that data to the user.
1st ,when the event of cell formating is fired, is fired only for the visible area of datagridview rows? or is making changes for all the rows in the datagridview.
2nd , is there any way to load only data that are visible in the datagridview area and when the user scrolls down or up to query also the rest?
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Oct 15, 2010
I've got a form that populates a DataGridView from an excel file. How would I filter that DataGridView so only the search criteria are visible. I need to search through 2 columns by all rows. I'm not very good with datasources I guess and can't figure out what all I need to accomplish this. DataSets, DataViews, DataTables.
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Apr 15, 2010
How to make the textbox's border set to visible in a datagridview?[code]...
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Aug 3, 2009
I have a tabcontrol which contain 4 tabpages. Each tabpage have a datagridview.
When i select any tabpage the datagridview of it will show.
I want to check what datagridview is showwing(visible) in button1 click event.
I dont want to loop through controls thenafter check visible propety of control.
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Dec 8, 2010
How i make a button visible or Un Visible using the DataGridView's Checkbox...
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Oct 20, 2010
I am running a website for a F1 racing game, where users can submit their laptimes and compete with each other for the fastest time.
I am now trying to have my website create an image of the top-5 users every... 5 minutes or something, and copy it to the webserver somewhere I can link to. This way the image under that link will update with the latest information every 5 minutes.
To layout the times (these also include the position (1 to 5), the username, the platform, the time of course, and some more details) I am using a DataGridView. I could take the long route and layout the specific 'columns' manually, but I thought using a grid was far easier. I simply set some properties of the grid to make it look nothing like a grid (basically hide the column and row headers and grid lines and give everything the same backcolor). Then I load the times into the grid, and take an image of it using the Control.DrawToBitmap method.
This works fine, but it returns the entire grid. This is a problem because I made the grid extremely large (5000x5000) so that it can always accommodate the times regardless of the length of the usernames. So, the image I get is 5000 pixels wide while it only contains data in the first 500 px orso.
I am currently using the GetRowDisplayRectangle and GetColumnDisplayRectangle methods to figure out the part of the grid that actually displays the times, and use that to cut the image down to the portion I need.
But here's a problem: these methods only return something when the grid is on a form that is currently being shown! I am already giving the grid a parent form (even though I am just creating it in memory and it doesn't need to be displayed anywhere) because otherwise the data wouldn't load, but I was never showing that form. Now it turns out I do need to show the form, very briefly, in order to figure out the area that I need to take a snapshot from.
Remember that this is all happening on a webserver, so I'm not absolutely sure if this is a problem. Is it ok for a webserver to have a form popping up and down every 5 minutes? Or will this cause problems? I honestly don't know but I don't think it's a good thing. Moreover, it also pops up on my own machine when I'm testing, and it's damn annoying.
So my question is basically twofold:
1. Maybe I should ask this in the ASP.NET forum, but is it a problem to show a form briefly every 5 minutes?
2. Is there any other way to get these Get...DisplayRectangle methods to work without having the grid on a physically visible form?
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Mar 21, 2011
Having an issue with my data gridview. I've set the visible property of the ID column to false, and in the designer the column is hidden, yet it still shows up when i run it. Now if i set it to True it shows the column twice.
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Aug 2, 2010
I have 2 datagridviews on different tabs of a tabcontrol.The user can input names into datagridview1 column1.I want these names to automatically appear in datagridview2 column1, in such a way that when rows in datagridview1 are added and removed the same rows are added and removed in datagridview2.I also want the column sort function to effect datagridview2.
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Jan 28, 2009
I've got a panel - that's in a group box. All of this - with lots of other textboxes on labels - is in another panel (the big panel).I make the big panel visible and not visible based on selections made by the user.This small panel - that's in the group box. I cannot seem to make it appear.Even if I leave it VISIBLE at design time - the objects in it will not appear.Is there some kind of nesting problem that I'm not aware of!
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