Datagridview And Comboboxes - Getting Message "DBTableName Does Not Exist"?
Aug 4, 2011
I'd like to create a data bound comboboxcolumn off of the distinct results of a view in my database. The view returns tablenames within the database which do not already have an entry configured. I use this as a entry to tell a purge application how and what tables to purge.Setting up this combobox proves to be a little more difficult than I imagined because my view pulls from informationschema.columns in the master db and therefore is unrelated in the 1:M traditional scenario. So as a result my displaymember and valuemember get the same field unlike most examples I see where some integer or enum is the backing value in the valuemember. Not the case here.
When I put all this together and run the code I do have choices in my drop down list but the current cell is blank. What is going on here?..create column
Dim Tablenamecolumn As DataGridViewComboBoxColumn = New DataGridViewComboBoxColumn()
With Tablenamecolumn
.Name = "DBTableName"[code]....
If I change things around a little bit and I get an argumentexception telling me that "DBTableName does not exist".I have one query that on startup calls for all my entries in purgeconfig table and it contains "DBTableName". Then I have another query which returns me a single column with many rows and a different field name and that's what I am using for the column's datasource. I can manipulate that query to change the column name to match "DBTableName" that the other datatable has, yet it still doesn't work. Do I need to create a data relation or something between them? Why aren't they wiring up?
The only way I can make my code work without the argument exception is to refer to my combobox with the field name of the column coming out of my View. Anytime I start using the other column name it throws the argument exception.This isn't the only column i'm going to need to do like this and i've spent a lot of time trying to figure out what i've done wrong and why it doesn't display the current value in the cell, only a blank cell insteadl.
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Apr 23, 2012
I want a Code to check Database exist in SQL and Message Box Show Database Exist Yes/NO?
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Sep 7, 2009
I have a VB2008 with SQL2005 MDI application with multible forms, and Form1 has serveral Textboxes, and Textbox1 is binded with SQL database Table1 Column ID, what I want to do is when try to save data if ID xxx aready exist then it spit out a message (ID already exist.)
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Jul 4, 2009
I want a message box to show when a username doesn't exist. I figured this would work but an error shows saying 'FileNotFoundException was Unhandled', for the fist line.
Dim UserFile As New System.IO.StreamReader(sPath & "" & UsernameBox.Text & ".txt")
Username = UserFile.ReadLine
Password = UserFile.ReadLine
[Code].....
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Oct 3, 2009
how to Check Exist Database in SQL And Message box Show Answer?
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May 10, 2010
im trying to generate an error message to the user to let them know a file doesnt exist.So far ive got the user to enter the file name into a textbox, they click search and if successful will load a new form with a PDF file reader built in( AxAcroPDF1 )everytime i enter the right file name i get the file loaded, if enter the wrong name the File page still loads with no pdf and no message saying file doesnt exist.
Private
Sub PictureBox1_Click(ByVal
sender As System.Object,
ByVal e
[code]....
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Sep 11, 2010
i have a datagridview with a column with comboboxes. My problem is that the changes that i am doing from comboboxes didn't occur to datagridview immediately but after the user click to another cell.
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Apr 2, 2009
I have a vb.net window app that has a number of combo boxes on it. These are being populated from a number of XML files and all this works like a charm. The problem i have is when it comes to putting the comboboxes in a datagridview. I have set up my columns and have set the first column to be a combobox but i'm having problems referencing this so that i can set the datasource to populate it.
I've looked everywhere but cant seem to find how to reference this control. Once this has been selected it will populate a second combo box based on the data from the first. I think i can sort this out, if i could only work out how to set the datasource of the first combo programatically.
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Dec 1, 2011
What I want to do is use two drop down comboxes (Comboboxes 1 & 2)in tandem in a databound datagridview.Both comboboxes are bound to tables in an SQL 2005 database.By this I mean select an item in combobox 1 and have its display member appear in that combobox.This is usually text.The value member for combobox 1 to be displayed in the combobox 2 which is also text.The value member from combobox 1 has identical values to the display member of combobox 2 in the database tables.If I need to change the display member in combobox 2, as all situations have their exceptions, I want to do this without changing combobox 1.The value member for combobox 2 is numeric and is put into another cell in the DGV for carrying out calculations.I have managed to get the display of combobox 1 working on its own and ignoring the value member.I have done the same with combobox 2 and have the value member working correctly.
Can databound comboboxes be used in this manner or will VB.net not allow this type of operation.I have not done this with any code. I tried to get my required operation through the edit facility in the DGV.When attempting to run the program, it does not compile and throws an error which basically says "You have done something wrong.Sort it out."Typical Microsoft help! Can it be done using code in the datasets or binding sources?
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Oct 3, 2011
I have problem with a datagridview with combo boxes firing unwanted events handlers.I have a datagridview with 4 columns all data bound. All of these columns have comboboxes. Column 2,3,4 has a custom generated combobox with code with on the 'DataGridView_EditingControlShowing event' and have event handlers (Dropdown,selected Etc). (Data in the custom generated comboboxes needs to be filtered and worked on)
[Code]...
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May 5, 2009
I have three comboboxes in a form. The first is the parent of the second, which is the parent of the third. When they are all updated, a datagridview should be updated.
The problem is that the user can choose to change the value of either combobox, so I don't know which combobox's value is being changed. Therefore I now update the datagridview from the third combobox's selectedvaluechanged event. This unfortunately means that if the first combobox is changed, the second and third comboboxes selectedvalue events must trigger. As a consequence, when the first combobox is changed, the datagridview is being updated about six times (which doesn't work for me performancewise).
What I'd like to do is to call the updatedatagridview sub from either one of the three comboboxes, but only if the user has chosen to change that specific combobox's value (that is, get the form to only update the datagridview when the selectedvalues of all three comboboxes have been set).
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Oct 13, 2010
I have a form that lists all of the clients in a DataGridView and when I click on a column that is a Link I want the data to populate into the form I use to capture. My problem is that when I click on the link all the TextBoxes on the form are filled correctly but my ComboBoxes are not.[code]
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Dec 11, 2011
i've uploaded in SkyDrive my project to give a better picture of my problem:
Cascading Combobox works just once in _SelectionChangeCommitted,
and, DataGridView do not follow 3rd Combobox filter
[Code]...
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Apr 24, 2012
this is a subset of a previously posted problem, I have narrowed down my issue and am reposting a question from this thread: [URL] I have apparently confused the compiler by renaming some comboboxes in Visual Basic .net express? (See relevant code below) I think the confusion is in who should handle what, with two routines named with variations of ComboBox1 and one handling the other ( it confuses me just trying to interpret it mentally):
[Code]...
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May 30, 2010
1) Ive put the code to execute a file, it works fine but i want a way to show a popup/message if the file does not exist instead of the typical 'Unhandles exception has occured, system cannot find the file specified.' My code is below, i dont mind using a differend code as long as it opens the file Program FilesInfinity SoftwareAeroCrash Apps11.acep
[Code]...
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Oct 28, 2011
I have a form with 4 comboboxes and a button. The first combobox is enabled, but the rest of the controls are disabled. When the form is opened I fill the first combobox (cbxMethod) with a datatable. When the user selects something in cbxMethod the next combobox (cbxStudy) will be filled and so on. When the last combobox (cbxAnalyte) has a selected value I want to enable the button and give it focus so the user can move forward with the program. I basically want to force the user to move from one combobox to the other, until all are filled.I am currently using the SelectionValueChange event, but this event only fires when the user changes the value with their mouse or hits the Enter key, not when the user hits the Tab key.
Public Class frmCalculatedAnalyte
Private cv_dt As New DataTable
Public Sub New()
[code]....
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Dec 21, 2010
I try to find online any example for create an application autoupdate.
When I run my application it check in a webserver if exist new version,if exist the software run update.
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Dec 11, 2011
I've uploaded in SkyDrive my project to give a better picture of my problem:Cascading Combobox works just once in _SelectionChangeCommitted, and, DataGridView do not follow 3rd Combobox filter?
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Nov 25, 2010
namespace of "system.runtime.caching" does not exist but in object explorer and microsof exist.i use microsoft visual studio 2010 and .net framework 4.0.i also cant use this name space(System.IO.MemoryMappedFiles & System.Runtime.Caching.MemoryCache)
any body know what is the problem. i want my program after doing something (opening a file or any thing that can do something my program use more memory.)use memory like startup run.
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Jan 16, 2011
Here's my code:
Option Infer Off
Option Explicit On
Option Strict On
Public Class Form1
Public Sub NewToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles NewToolStripMenuItem.Click
[Code]...
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Sep 16, 2009
I have Requests for VB(2005) very very important for my selly project!i need a button that determine if file exist and if that file exist then show a messagebox!and if not show messagebox!.
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Mar 22, 2011
I may have missed the solution to this problem, but in my database I have 2 columns that cannot be null and a system.NoNullAllowedException message is displayed if they are mt. I want to change this message to simply indicate that the cell cannot be null, instead of the huge message with all of the information which is of no use to the user. I cannot seem to find where to change this message. When the exception is thrown I would like to see the message say something like "Empty cell not allowed".
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Feb 8, 2012
I am uploading an excel data to display in a datagridview and when i click on an update button it updates the database.but I want a code that will look up a column and get a value then display in a message box like "Data uploaded successfully for @ChurchID"where @Churchid is a column in the excel sheet but the id is the same but unique for every excel sheet upload If the upload is not successfull then it should give a failed message for that @churchID
Code
Dim i As Integer
For i = 0 To (Me.DataGridView1.RowCount - 1) - 1
Dim Connection As New OleDb.OleDbConnection("Provider=Microsoft.ace.oledb.12.0;data source=C:Documents and Settingsmichael.marteyMy DocumentsVisual Studio 2005ProjectsmyRegistermyRegisterinDebugChurchesRegister.mdb")
[code]....
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May 20, 2010
I have the following code and I want to say that if the datagridview - dgvImportData is empty then say this message otherwise say the other message.
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Apr 22, 2009
I have couple of questions with datagridview 1.How to handle the Enter-Key when the user edited the columns value.?I mean, without changing the columns values we can suppress the enter-key by following. No problem. It's working Fine.
Private Sub DataGridView1_KeyDown(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles DataGridView1.KeyDown
If e.KeyCode = Keys.Enter Then
Dim numCols As Integer = DataGridView1.ColumnCount
Dim numRows As Integer = DataGridView1.RowCount
[code]....
But after if I select any one column & changed the values then if I press <Enter> it's moving to next row. But I want to move it to next column..
2. With Datagridview - I have a column for date. and it's defaut format is mm/dd/yyyy. But Iam looking to read the date by "dd/mm/yyyy" format. Also if the user feed wrong date format then it has to display my Error message. "INVALID DATE"
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May 1, 2009
Public Class Form1
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Me.StaffTableAdapter.Fill(Me.StaffDBDataSet.Staff)
BindingNavigator1.DeleteItem = Nothing 'Clear the default value of BindingNavigator's DeleteItem property
End Sub
[code].....
When I selected a record in datagridview and hit delete, it always deleted the first row in the datagridview then if I tried to delete any of the row again, it would not let me. I would like the selected row to be deleted,how I can do that?
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Oct 20, 2010
I want to do what I have done in the past, using the old VB6. Subclassing has changed a lot since VB6 and I still want to do the same:
I need to intercept WM_PAINT of DataGridView, send it to a memory device context (to avoid flickering), make some visual changes, like place a logo over all over the grid. With VB6, was easy to do. I have spend hours trying to convert VB6/API code to Visual Basic Express 2010 code, without success.
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Sep 1, 2010
I have DataGridView display Customers Details. The DataSource are from DataSet. After the user have created a new customer record and updated the SQL SERVER Table, Instread of refreshing the whole DataGridView I am trying to add new rows with data from the TEXTBOX into the DataGridView and it generated this error message: Rows cannot be programmatically added to DataGridView's row collection when the control is data-bound This is the coding which the error was generated from:
Private Sub FRefreshDataGridViewRow()
'use strmode to determine New or Edit existing record
Dim strCell1 As String = CType(Me.txtCustId.Text, String)
Dim strCell2 As String = CType(Me.txtCompName.Text, String)
[code].....
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Jan 6, 2010
create a message box that stores my user name, message, and post datetime into the database as messages are sent. Soon came to realise, what if the user changed his name? So I decided to use the user id (icn) to identify the message poster instead. However, my chunk of codes keep giving me the same error. Says that there are no rows in the dataset.
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
Dim name As String
Dim icn As String
Dim message As String
[code]....
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Feb 22, 2009
how to create an error message by message box to tell the user to enter a number only if they key in a character value?
I MEAN AFTER THEY PRESS THE CALCULATE BUTTON
Private Sub btnCalcFat_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnCalcFat.Click
Dim intFat As Integer
intFat = Integer.Parse(txtFat.Text)
lblResultDisplay.Text = txtFat.Text * 9
End Sub
My text box is call txtFat
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