I've been searching around a lot to figure this out. I found some code that sort of works:
VB.NET
If String.IsNullOrEmpty(CStr(Me.dgvList.Rows(i).Cells(0).Value)) Then
End If
[code].....
[Code]....
IF cursor leaves column 0 and row 0 then it displays msgbox but I want to check where column 0 and row 0 has value or empty In case of empty cell it must display msg as
msgbox("this is empty cell")
The following code records the row and column of a selected cell.
[code]...
.
If MonthDGV.Rows(selectedRowIndices(0)).Cells(selectedColumnIndices(2)).Style.BackColor = Color.White Then but that is no use. As there could numerous selected cells all over the place, how would I check the BackColor of all the selected cells.
What is the best datagridview event to use these codes I want to check column 0 is empty or has some value
If e.ColumnIndex = 0 Then
If DataGridView1.CurrentCell.Value = "" Then
MsgBox("Empty Value")
[code]....
Im using this code to populate a datagridview:
Private Sub PopGrid(ByVal Filename As String)
Dim ConnectionString As String = "Driver={Microsoft Excel Driver (*.xls)};READONLY=FALSE;DriverId=790;Dbq=" & Filename & ";"
Dim Con As New OdbcConnection(ConnectionString)
[code]....
But when i look at the grid, there is alot of empty cells that is NOT empty in the excelsheet.
Ok I'm handling the RowPostPaint event so I can have the row's bounds so I can draw over that row in a custom manner.It looks good when it first loads, but as soon as I start scrolling, things get all wacky and aren't drawing.So when I first load the form, the grid looks like so:Looks good so far.But when I scroll to the bottom, it looks like this:It looks like the rows that aren't initially visible never get drawn, but don't even get drawn (the text anyways) even after the the row has been drawn.When I scroll back up to the top after this, it's looks like:Here is my RowPostPaint code, it's a little long but I tried to comment it so things wouldn't be too confusing.
vb.net
Private Sub dgv_paint(ByVal sender As Object, ByVal e As DataGridViewRowPostPaintEventArgs) Handles DataGridView1.RowPostPaint 'Set up
[code].....
in datagridview control is there any method to merge the cells across the rows
i need to merge a button column across other rows basing on some cell values
of column 1
This works:
DataGridView.Rows.Add("Bla Bla Bla", value1, value2)
But if I do:
Dim newrow As New DataGridViewRow
newrow.SetValues("Bla Bla Bla", value1, value2)
If Not value1.Equals(value2) Then
[Code]....
the entire row is empty.
Why is the row full of empty cells?
I'm extracting data form a mysql using a huge query made up of three unions to searc on different tables for a telephone number. e.g. contacts, leads, etc.Iy workd perfectly in a sql tool and is well tested.When I run the query in visual studio, I get a result, two columns contaon the same image you get when a webpage image link is boken. These columns should contain a mobile phone number and an ID.Both are stored on mysql as varchars.No data is presented for these columns even though it exists with gaps
View 3 RepliesI'm binding data table to datagrid but i'm not sure how to delete the empty cells in that data table
View 8 RepliesI am trying to draw arrows between the cells on datagridview. The problem is, if I make graphics with:
VB.Net
Dim g As Graphics = dgwTable.CreateGraphics
Then draw something with this graphics, my lines stay behind the cells. Is there any way to draw onto the cells?Is there any way to draw arrows?
Is there any way to merge cells in datagridview in vb2008 like we could do it in excel?
View 6 RepliesHow can i replace selected cells in a datagridview by using copy and paste or some other method. I want to highlight a Row or Column and then replace all the highlighted cells with one value
View 3 RepliesI have made a form that consists of textboxes nested in groupboxes nested in tabpages. I want to check if all textboxes are empty in every groupbox and even if the controls from a groupbox in a groupbox are empty.When they are empty i should not create an element string for my .xml document.Below is the code that I have at the moment. I call it with the form as the parameter.
Public Sub recurringControls(ByRef ctl As Control)
For Each c As Control In ctl.Controls
If c.Controls.Count > 0 Then
If c.Tag IsNot Nothing Then
[Code]...
I was looking for some code that would change the colors of some rows in my datagridview but I could not get that to work. I have this code which should work but it doesn't, I could not find any replacements. I need to change the color of some rows.
Do While cnt > -1 If datagridorder.Rows(cnt).Cells.Item("DataGridViewTextBoxColumn16").Value.ToString.Substring(datagridorder.Rows(cnt).Cells.Item("DataGridViewTextBoxColumn16").Value.ToString.Length - 5, 5) = "Cease" Then
datagridorder.Rows(cnt).DefaultCellStyle.BackColor = Color.Red
End If
cnt -= 1
Loop
I've a datagridview with a multiline textboxcolum, if the cell content is small (one line) the scroll works fine and I can see the content of all rows. But, if a row cell content is very large (ten lines), only is visible the top of the cell and if I try scroll down, the scroll goes to the next row without can see the rest of the cell text, even using the arrows for move inside the cell, the bottom is not visible.I was searching in the web and the only solution is use panel and put inside the datagridview. It looks me a fix more than a solution.
View 1 RepliesI'm writing a VB.NET program (VS 2005) that reads data from an XML document and writes it into a column in an excel spreadsheet. It's working fine, except for the following: after the first run, all the data appears as expected - for example
COLUMN
a
b
[code]......
I have a DataGridView that has some columns with dates. It binds to an in-memory Datatable which gets loaded from an string array of data passed back from the backend Some of the rows returned have nulls for the date columns. Solution 1: If I define the Date column in the DataTable as "string" I can easily convert those nulls to empty strings and display it in the grid as empty strings (desired results). However, if the user clicks on the date column header to sort by date, it doesn't order the rows as you want. You get a purely string sort order. Not acceptable
[Code]...
i tick a check box in my datagridview, the cell in column 3 of the same row will change colour? this needs to apply to all check boxes and corresponding cells.
View 5 RepliesI want to know how many cell a namedRange contains . or want to check either a named range contains a single cell or multiple cells.
View 2 RepliesI 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".
A really boring question, sorry, but I really don't know that yet ;) I've tryed always string.empty, but with a decimal, there is an error.
View 3 Replies[code]... Check Datagrid Is Empty?
View 1 Repliesi have a dataset that takes results from a select to a sql database. the select returns rows and sometimes returns no rows. how can i check if the dataset has no rows from the select? [Code]
View 4 RepliesI need to check if a .txt file is empty, if it's not, the code will read the file and process the information.I know how to read .txt file. Is there a way to check if the .txt file is empty? not an empty line just completely empty?
View 3 RepliesOn a button click I need to test whether or not an array has been filled, if it has the user gets linked to a new form otherwise they receive a message box telling them to first assign values to the array.
I've tried 'If MyArray Is Nothing Then....' and 'If MyArray.Length < 1 Then...' but neither seemed to have worked.
I was wondering how to check if a list box is not empty I have inserted my code I want t check if there if text in the listbox and if there is no text do some thing. I have put the line of code i am having trouble with in red
result = MsgBox("Are you sure you wish to make the required number of lockers", MsgBoxStyle.YesNo, "Confirm Order")
If (result = MsgBoxResult.Yes) Then
CheckLevels()
If lstOrder.NoItems = True Then
[Code]...
I've done an internet search to determine if I can detail if a SQLDataAdapter is empty after running an SQLCommand? My research so far point I can't check if the SQL dataAdapter is empty until I bind it to a dataset/datatable. Ideally would not like to run another SQL command to do a row count to determine if query retruns rows or not. I'm populating a datagridview and would like to alert the user that there is no data to view. What's the most efficent way to check if an SQLDataAdapter is empty?
View 4 Repliesi want to insert the data into the table only if the table is empty, so for that i need to check the condition to check whether data already exists in the table, if present then i want to empty the table before inserting the the fresh value.
i know how to insert and delete the data only prob is to check the condition. so please can any help me out in this.
TO INSERT
Dim comUserSelect As OleDbCommand
myDateTime(i) = DateTime.Parse(arr_dateTime(i))
' Console.WriteLine(r("P1"))
[Code].....
In Visual Basic 2010 I have a PictureBox control which i need to check in code to see if it does not contain an image.
View 2 Replies
