Datagridview - Remove Wrong Columns And Display The Wrong Data
Jan 12, 2010
I've got a DataGridview I want to remove columns from as it greatly increases performance when I format the DGV. The first time I remove columns in a loop (using the removeat) property, everythings fine. But when I try to remove more columns in another loop, it appears to remove the wrong columns and displays the wrong data. In other words, it displays the wrong data and headers; and the columns it does show has headers and cells that don't match.
[Code]...
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Nov 4, 2011
I need to have multiple lines in a cell, so I use DataGridViewTextBoxColumn.DefaultCellStyle.WrapMode =DataGridViewTriState.True. I add columns (datagridviewtextboxcolumn) in designer. Then bound datagridview to a table which has exact the same columns as datagridview. Then I find that datagridview has duplicate columns: the first column is empty (which I guess is added through designer), the second column is filled with data from table. My question is how to correctly allow multi-lines and bound to a table at the same time?
In Designer
Friend WithEvents DGV As New System.Windows.Forms.DataGridView
Friend WithEvents columnClient As System.Windows.Forms.DataGridViewTextBoxColumn
Friend WithEvents columnAccount As System.Windows.Forms.DataGridViewTextBoxColumn
Me.DGV.Columns.AddRange(New System.Windows.Forms.DataGridViewColumn()
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Aug 11, 2010
I have a ListView that populates and displays a user's data (via a profile system in VWD 2008) during Page_Load and also when I go from the EditItemTemplate to the ItemTemplate. When I go to the edit screen again, my DropDownList and RadioButtonList controls display the first items in the corresponding tables instead of the correct profile values.
I don't understand why the controls populate correctly the first and second times but not on the third time (that's right, the third time is NOT a charm).how to solve this problem?
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Feb 10, 2012
I have a problem in listing records in listview.
example: Date today: 2/11/2011
Book Due Date
BOOK1 2/8/2011
BOOK2 2/15/2011
I think the problem is in query, and I can't figure it out. I have two queries..
First is this: "SELECT * FROM `tbl_trans` WHERE `t_bk_duedate` >= '" & DateValue(Now) & "'" It must only show the "BOOK2", but unfortunately, it displays all the records.
The second query is: "SELECT * FROM `tbl_trans` WHERE `t_bk_duedate` < '" & DateValue(Now) & "'" It must display the "BOOK1" but displays nothing at all.
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Feb 4, 2011
the values in the datagridview column datevalues is showing "February 03, 2011 6:30" but is writing in database "February 03, 2011 6:29:59" .i don't know how to fix this
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Jul 5, 2011
I have this database and I need to load it with a visual basic form in Visual Studio 2005.The database has 6 tables and they contain wrong data that I must filter when loading the database in the form.
A quick example:First table is Category, which has 3 fields (id, name, description). In one record I have 2a for id (a numeric only field) and in other record I have m1lk for name (a string only field).
When I click a button I load the database into a DataGridView control. How do I stop visual basic from loading into the DataGridView control those records that have invalid data (like in my example).
I have try with SQL queries using WHERE and LIKE, like in
SELECT IdCategoría, NombreCategoría, Descripción
FROM Categorías
WHERE (NombreCategoría LIKE '[!l]%') AND (IdCategoría LIKE '[!abcdefghijklmnñopqrstuvwxyz]')
but it's really difficult to filter things like Angel* and P3ter and Hood8, all at the same time..
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Jun 1, 2011
I want to have one event triggered when I type something wrong in the cell in the specific column in the datagridview. What event should be? Or cell leave?
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Nov 8, 2011
I'm working with datagridview.I found an example on the web about creating a datagridview: firs I make my array containing data, then I make a datatable from array, then I make datagridview from datatable.I don't know if it's the correct way but it seems work.In a column I make random numbers for test: for example I have on column "Time" these values: 1155, 1725, 584, 996, 1352.Then I try to sort with code when I press pushbutton: it doesn't work because I have the values:1155, 1352, 1725, 1758 (until now it seems to work correctly), but then I have 584 and 996 values: wrong!Ok, let's try with the manual sorting: same result.I filled cells with "integer" values, let's try using strings, then I used "value.tostring" same result.I also tryed to fill strings with blankspaces to obtain same length, but nothing changed. "1155", "1352", "1725", "1758", " 584", " 996".Then I tryed to fill with "0" values:"1155", "1352", "1725", "1758", "0584", "0996".The same.How can I fill cells values?
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Mar 15, 2012
i have a system that will search a data and print it, the problem is that everytime a search the data and shows its result when i try to view it using crystal report it shows a wrong data... the crystal report shows the very last entry that the user added and ignored the previous data.
heres my code;
Dim frm As New PClearViewer
PClearViewer.Show()
[code].....
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Dec 13, 2009
I have a program that receives serial data from a microcontroller and displays it.If I use windows terminal I get the right data.For some reason my program is not displaying the right data.What is sent is temperature.So the actual data is 24 degreesC and my program is showing 10 degreesC.
Private
Sub SerialPort1_DataReceived(ByVal sender As Object, ByVal e As System.IO.Ports.SerialDataReceivedEventArgs) Handles SerialPort1.DataReceived
[code]....
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Mar 12, 2012
I am trying to build a windows phone 7 app with vb.net And i need to clear my listbox:
[Code]...
I would like to remove the "wrong numbers" because i want to get the average. In this case the wrong numbers are: too low: 100, 21, 200 too high: 5200 I just figure out a way to do this For each items in listbox
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Jul 1, 2009
I am trying to read some data from an Excel 8.0 worksheet using OLEDB thusly:(Warning - contains curly braces)
Code:
DbProviderFactory factory = DbProviderFactories.GetFactory("System.Data.OleDb");
using (DbConnection connection = factory.CreateConnection())
{
[code]....
The problem is that for some columns it sets the data type to be Double even though the spreadsheet column format is "Text" and teh column contains non-numeric data. Then when it gets to that cell it returns DBNull instead of the text value.
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Nov 14, 2008
Imports System.Runtime.InteropServices
Imports BOOL = System.Boolean
Public Class Form1
Public Structure MIB_TCPROW_OWNER_PID
Dim dwState As Integer
[code]....
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Mar 26, 2010
My MS-Access database contains 30 "table" files with identical formats (e.g. Composer, Arranger,Lyricist, etc.) and I use a common VB.NET form and DataGridView for displaying and editing any one of the 30 tables. When a user makes a menu choice, the menu program puts the file name and its first field into two global variables and then shows a form that contains an unbound DataGridView. This other form then loads a dataset from the appropriate database table and programatically binds the DataGridView to the DataSet. (I clear the dataset before filling it.)
All goes well and three DataGridView columns are displayed for the first time. However on subsequent operations, the DataGridView retains the columns that were previously generated along with their column headings (but no data) and I get six DataGridView columns. On the third operation I get nine DataGridView columns.
I have unsuccessfully tried to obtain a count of the number of DataGridView columns so that I can remove them from the DataGridView but it always gives me a column count of zero.How can I accomplish the simple task of removing all columns from the DataGridView?
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Aug 28, 2011
How can I chanage the code below to work with a datagridview:
Public NotInheritable Class DataColumnCollectionExtensions
Private Sub New()
End Sub
[code].....
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Jan 25, 2010
How to tell a programmer he is wrong?
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Jan 15, 2012
I have a login form which accesses to my website by WebBrowser. You have to put Username and Password in the two Textboxes to login... It works fine and it loggs me in to my site...but how can I tell if the password is wrong or not?
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Jun 12, 2012
I am trying to wrote to the registry but it redirect to the wow6432node instead of where I want it, how do I fix this?
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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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Feb 5, 2010
I am converting a VBA program to VB. I need to create controls at runtime as I don't want the user to be limited to the amount of information that they can input. I am converting this statement in vba:
Dim CF As CashFlowControl
CF = New CashFlowControl
CF.Cashflow = Form1.Controls.Add("Forms.Textbox.1", "Cashflow" & Cashflows.Count + 1, True)
With CF.Cashflow
.Left = Form1.Label2.Left
.Width = Form1.Label2.Width
.Top = Form1.Label2.Top + Form1.Label2.Height + (Form1.Label2.Height * Cashflows.Count) + 5
.Visible = True
.Text = 0
.Text = Format(CF.Cashflow.Text, "$#,##0.00")
End With
I have tried:
Dim txtbox As New TextBox
CF.CashFlow = Form1.Controls.Add(txtbox)
With CF.CashFlow
.Name = "CashFlow" & Cashflows.Count + 1
.Left = Form1.Label2.Left
.Width = Form1.Label2.Width
.Top = Form1.Label2.Top + Form1.Label2.Height + (Form1.Label2.Height * Cashflows.Count) + 5
.Height = Form1.Label2.Height
.Visible = True
End With
I've also tried:
CF.CashFlow = Form1.Controls.Add("vbtextbox","Cashflow" & Cashflows.count + 1)
With CF.CashFlow
.Left = Form1.Label2.Left
.Width = Form1.Label2.Width
.Top = Form1.Label2.Top + Form1.Label2.Height + (Form1.Label2.Height * Cashflows.Count) + 5
.Height = Form1.Label2.Height
.Visible = True
End With
I still get the little wavy underline under the text after the "Form1.Controls.Add" statement and the error says "Value of Type 'string' cannot be converted to 'system.windows.forms.control." I also get the error "Too many arguments to 'Public Overridable Sub Add(value as systems.windows.forms.control)"
What am I missing here? This seems to be the way it is done in all of the examples that I have found on this site.
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Jun 29, 2010
So i had a some objects on my project like a few textboxs and buttons, which all had code tied to. For example text1 button1. I delete the two objects (not code) from the project and then paste a text1 and button1 (same exact names) back into the form. now when you click button1 or text1 you get
"Private Sub Button7_Click_1(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button7.Click"
rather than the code all ready in the project for button7. The reason im doing this weird situation was because i goofed some of the object settings and was copy and pasting the old objects from a backup version.
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Jul 30, 2010
I'm quite new to VB Programming and I'm using Microsoft Visual Studio 2008 for programming. I'm writing an application that communicates with an Omron PLC via CX-Server Lite which brings some ActiveX plugins for VB. So far I solved a couple of problems and my application "is doing something" already.My question in the end might be really easy. I inserted 3 bitlamps (Omron ActiveX Components) in a form, gave them the size and position I wanted them to have. When I now start my application they show up in the wrong size. It seems as if they would keep there position but they simply have the wrong size and even overlap each others although I have them sorted nicely in Visual Studio.Another effect I have is, sometimes when I move the components around on the Form in Visual Studio they seem to be "behind" the Form. I can't see them anymore but i can highlight and move them.
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Jun 7, 2009
I made a chat-room in Visual Basic, but when I run the deBug it works fine. When I build the application that's where things go wrong. I am using C4F-P2P.
Unhandled exception has occurred in your application. If you click Continue, the application will ignore this error and attempt to continue. If you click Quit, the application will close immediately.
An error occurred creating the form. See Exception.InnerException for details. The error is: Could not load file or assembly 'C4F_P2PWinformControls. Version=1.0.0.0, Culture=neutral. PublicKey Token=9569f7192217be80' or one of its dependencies. The system cannot find the file specified. ""DETAILS"" See the end of this message for details on invoking just-in-time (JIT) debugging instead of this dialog box.
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Jan 24, 2012
I have two (2) variables in a textbox (L7B) and (D2B).
TextBox3.Text = (L7B) &
" " & (D2B)
I want to write over (L7B) without changing " " & (D2B).I have been using the TextBox3.Text.remove command with success however in this case there are just too many scenarios. (D2B) isn't the same number of characters so I would have to determine the number of characters to remove in each scenario.
To write over (L7B) I thought I would try TextBox3.Text.remove ((L7B)). To my amazement VB accepted this command but when I run it it removes " " & (D2B). How is it removing the wrong variable? I could understand if it didn't work at all, after all that's what I expected to start but to delete the wrong variable !! why?
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Dec 12, 2009
I'm attempting the following code to calculate how many quarters, dimes, nickels and pennies a user should get as change, and display them in four labels, when buying an item from a machine. The user inserts the amount paid and the cost of the item in two textboxes.My code is as follows:
Code:
Private Sub btnCalc_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnCalc.Click
[code].....
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Jun 16, 2010
I have a byte array that I'm encoding to a string:[code]Then I write that to a file via IO.File.AppendAllText.If I open that file in 010 Editor (to view the binary data) it displays as this:47 43 44 53 79 73 74 65 6D 73 3F 0A 01 32 31 36..The original byte array contained 89 at position 11, and the encoded string contains 3F.If I change my encoding to Encoding.Default.GetString, it gives me:47 43 44 53 79 73 74 65 6D 73 E2 80 B0 0A 01 32 31 36.
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Feb 6, 2009
I'm working with VS2005 Pro. When I show the toolbox to add a control to the form all controls display the same icon. The icon changes from one session to the next, but remain the same as long as I have the IDE open. I've applied all updates and service packs and the problem persists. It doesn't stop me from adding the correct control, but does make it a bit more time consuming finding the right one.
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Mar 30, 2011
How ever it is returning wrong results. Any one spot the mistake. Needs to return the username / ID from every online user from [code]...
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Nov 20, 2009
Scroll Event goes wrong.I have this [code]...
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Jan 3, 2010
I can't manage how to fix.
Dim constring As String
Dim con As SqlCeConnection
Dim cmd As SqlCeCommand
[code]....
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