Database Updating, But GridView Remains Unchanged?
Oct 12, 2011
I've got my code to delete rows out of the database when the user clicks on the Delete button in my GridView, but the GridView isn't updating to reflect the new data changes.
Here's my code:
<asp:GridView runat="server" ID="grdQuestions" AutoGenerateColumns="false" Width="100%" CellSpacing="10"
PagerSettings-Visible="true">
<HeaderStyle CssClass="aspNetHeader" />
[code]....
EDIT 1:Did some stepping through the code and found that e.CommandArgument is not getting a value in grdQuestions_RowCommand
EDIT 1 (Revised):The fact that e.CommandArgument wasn't getting a value was my mistake. I'd changed the way it's value was being assigned without removing the previous method.The code runs through grdQuestions_RowCommand and then goes into grdQuestions_RowDeleting and then executes GetModuleData.I have a feeling that to view changes to the grid, a PostBack might be required, but I've removed all DataBinding to an If Not IsPostBack Then block because the alternative caused problems with the DropDownList whose selection is used as a reference to populate the grid (ddlModules selected the Module whose Questions will display in the grid).
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May 25, 2009
I want to compare differences between two tables in my database with identical schemas.
vb.net
DataTable1.Merge(DataTable2)
Dim changedRows As DataTable = DataTable1.GetChanges
'changedRows is always Nothing. Why???
The DataTable1 is updated with rows from DataTable2 correctly. i.e. missing rows are added and datarows that don't match are updated. But the RowState of each row is still unchanged. I need to have the rowstate (added/modified/deleted) so that I can update the database table.
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Nov 16, 2010
how i can take a row data in a datagrid and insert it into a table on my database?
I have the following code, but it doesnt seem to be working.
Dim conn As String = "Data Source=..."
Dim SQLString As String
Dim paramColl As SqlParameterCollection
[Code].....
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Aug 23, 2011
This is my code for update event
Protected Sub GridView1_RowUpdating(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewUpdateEventArgs) Handles GridView1.RowUpdating
Connection.Open()
[Code]....
it is deleting and fetching fine but while trying to update it shows nullreferenceexception was unhandled by user code in this line:
a = Trim(empname.Text.ToString)
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May 14, 2011
Protected Sub GridView1_RowCommand _
(sender As Object, e As GridViewCommandEventArgs) _
Handles GridView1.RowCommand
If e.CommandName.CompareTo("command") = 0 Then
Dim itemID As Integer = Convert.ToInt32( _
GridView1.DataKeys(Convert.ToInt32(e.CommandArgument)).Value)
[Code]...
Basically, it doesn't work and I don't get it. I've been trying to figure this out for a few days now and I can't see what I've done wrong. As you can see I'm trying to manually update a field in my database with the value of (originalvalue)+1 when the user clicks the buttonfield of the corresponding row.
I guess what I'm asking is if anyone can point out any mistakes, please do, or if there's a better way to do this (without having to go through all the DAL/BLL BS)
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Jan 15, 2012
STEP 1: I backup the database using this code snippet (It works fine)
Public Shared Sub BackupDatabase()
Dim sConnect As String = My.Settings.LICConnectionString
Dim dbName As String
[code].....
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May 14, 2010
The fact is I'm making an application, which users can install by using a Setup file...once installed the data in the database can be updated by a centralized server. To do this, they can insert a DVD/CD-ROM and export the necessary data towards it. I need to do it that way, because some of the users who really need this data will be using stand alone computers.The application gets it's data from a mdb-file and the connection remains open as long a person works with the application (maybe not the best way to do, but I know :-) )...when the user uses the application, he can perform an export...this exports the .ini-file and pictures (which works fine), but he also needs to export the mdb behind the application...I already tried connection.close() before and connection.open() after the System.IO.File.Copy...but that doesn't seems to work.
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Jul 21, 2011
I have a gridview and have modified it following this article: url...to allow bulk updates. Whenever I try to update a row in this loop:[code]
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Mar 30, 2011
i put all my custom "update" code in the RowCommand event, it works fine, but i still get an error from my Data Source
System.NotSupportedException: Updating
is not supported by ObjectDataSource
'GetSources' unless the UpdateMethod
[code].....
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Nov 18, 2011
What im trying to accomplish is to try to edit a gridview by using the updating event but not sure how to do this. The way im populating the datagrid is putting it into a dataSet and using that as the dataSource and doing a databind. Here is my datagrid below.
[Code]...
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Mar 18, 2011
For some reason, when i click edit on my gridview and change a value, and hit update, it does not update the database or the gridview, and it shows no error
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataKeyNames="id"
DataSourceID="SqlDataSource1" OnRowDataBound="GridView1_RowDataBound" AllowSorting="True" BackColor="White" BorderColor="#DEDFDE" BorderStyle="None" BorderWidth="1px" CellPadding="4" ForeColor="Black" GridLines="Vertical" ShowFooter="True" style="font-size: 10pt">
<Columns>
[Code]...
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Apr 15, 2012
The following code runs successfully with no errors, but I still don't get the new data from the grid, by adding a break point, and stepping forward, the data in the variables are the original data, not the updated data.
Private Sub grvSample_RowUpdating(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewUpdateEventArgs) Handles grvSample.RowUpdating
Dim row As GridViewRow = DirectCast(grvSample.Rows(e.RowIndex), GridViewRow)
Dim passportNumber As TextBox = DirectCast(row.FindControl("txtNumber"), TextBox)
Dim expiry As TextBox = DirectCast(row.FindControl("txtExpiry"), TextBox)
[Code] .....
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Jul 19, 2011
I'm working on a project where users search for an item with it's unique number, which retrieves the data from a stored procedure, ordered by date in different rows.That works ok. After that, i have to select a row to update it's status, like from "open" to "close"( I'm using a command Select button to select the rows), but the problem occurs when i click the "Update" button,
<%@ Page Language="VB" MasterPageFile="~/Master Pages/edenorte.master" AutoEventWireup="false" CodeFile="SubirCierre.aspx.vb" Inherits="Edenorte_Operations_SubirCierre" title="Untitled Page" %>
[code].....
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Dec 6, 2010
How to show pop up menu from database in gridview on each gridview row items ?Example of this is : http:[url].....Move your cursor to Departure time and arrival time...a want this type of popup in gridview items....which fetch entries from database..
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Dec 5, 2011
UPDATED: Here is the SP, it doesn't match exactly because of ongoing testing, but you get the jist. Some fields are commented out because of testing...
[Code]...
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Jul 6, 2010
I have the following datatable with the ordering of DataClassIndex column before editting:
DataclassIndex
0
1
[code].....
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May 28, 2010
I have a datagridview bound to a datatable via a dataview. The user is allowed to edit cells in the datagridview, thereby editing cells in the datatable. I recently found that if the user editted a cell, then closed the form without ever clicking on a different cell (thereby causing the current cell to commit), the change was vanishing because the editted contents of the cell were not being saved back to the datatable.
This was only happening if the user closed the form. Clicking on any other control on the form also caused the cell changes to commit. After rooting abut in the DGV properties, it appeared that all I needed to do is add the following code to the Form Closing event handler:
If Me.dgvCurrentRedds.IsCurrentCellDirty Then
Me.dgvCurrentRedds.CommitEdit(DataGridViewDataErrorContexts.Commit)
End If
Sure enough, this caused the change to be registered in the underlying datatable. However, it was then getting obliterated by a different process, so I went looking for the source of that problem, and eventually tracked it down to this:
While the preceding code is causing the datatable to receive the new information, the datarow that has been changed still has the status Unchanged, even though it should have the status Modified since it actually has been modified. The fact that it appears unchanged causes some other code to obliterate the change, but that's irrelevant.
The question is, why is the row status UnChanged when it certainly has been Changed, and is there any sound way to force the row status to update?
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Apr 18, 2011
I have a form with textboxes for input. I have coded the Exit button to display a message box that asks the user if they want to save any data in the textboxes before exiting the program:
Private
Sub btnExit_Click(ByVal
sender As System.Object,
ByVal e
[code]....
The question I have if the textboxes are blank (nothing has been entered), how do I code the Exit button to close the program without displaying the message box asking the user to save the data.' Save the numbers. Call the btnSave_Click procedure.
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Jun 11, 2010
I add a row to the DataSet using the following code:
Dim NewRow as DataRow
NewRow = gds.Tables("TitleDataSet").NewRow
NewRow("Title") = txtTitle.Text
NewRow("Local_number") = nubLocalnumber.Value
NewRow("Number_suffix") = txtNumberSuffix.Text
etc.
This code executes without errors but the bound DataGridView remains unchanged (without including the new row). Obviously I am doing something wrong or I am omitting a vital command. What do I need to do in order to make the new row appear in the DataGridView? I did not choose to bind the DataGridView directly to the database table because the database is selected by the user at execution time. Instead I bound the DataGridView to the DataSet. I included the command:L
dgvTitle.AllowUserToAddrows = True
but that did not have any effect.
Solved. Was missing the final command:L
gds.Tables("TitleDataSet").Rows.Add(NewRow)
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Jan 25, 2012
How can I assign a value to a message box for when the default value displayed in the text box is unchanged. ie. If my default value is 17 and the user clicks ok without retyping a number, the Input value displayed in a textbox will be 0.
Currently I have:
Public Class Form1
Dim MyValue As Double
Private Sub But_EnterInput_Click(sender As System.Object, e As System.EventArgs) Handles But_EnterInput.Click
MyValue = CDbl(InputBox("Input a value", "Data Input", "17", 200, 400))
[code]....
This works however if the user types 17, the textbox will read 0. not what i want.
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Jun 6, 2011
i am using MS ACCESS DATABASE for data processing in vb.net, so i need to change the "connection string" while re-compile in another machines ,so i want to make connection string as stable(unchanged for all environment)
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May 2, 2009
I've got lots of textboxes bound to a Dataset. When I make changes to a textbox with the mouse/keyboard the rowstate becomes changed - and when I do the .EndEdit and update the row it goes to the DB.
I've got some textboxes that get changed in code. When this happens the rowstate remains UNCHANGED. Updates to the DB never occur.If the textbox is changed in code and I also change another textbox in the UI then both changes make it to the DB.
I've verified that the "in-code" changed field in the dataset is actually changed - but the ROWSTATE is still printing as UNCHANGED.Here I'm showing that field 29 has changed to "blank" - but the RowState still is UNCHANGED. Why would changes to the .Text property of a bound control does programatically not change the row state?
Seems a google for this does uncover issues like this - but nothing that's helped me fix it so far - here's one link I can't make sense of[URL]..
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Feb 14, 2012
There is something wrong with my codes. I don't know why it isn't updating the records.If I activated the line dt.Rows.Add(newrow) it will just create an error on da.update(dt) line QuoteThe changes you requested to the table were not successful because they would create duplicate values in the index, primary key, or relationship. Change the data in the field or fields that contain duplicate data, remove the index, or redefine the index to permit duplicate entries and try again.But if I deactivate that line, no errors will be occurred but the record won't update.
Here is my code
Dim dt As New DataTable
Dim ds As New DataSet
ds.Tables.Add(dt)
Dim da As New OleDbDataAdapter
[code]....
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Jul 27, 2011
Whenever I try to update a row in my database, it works, but as soon as I restart the application, the changed information resets.[code]....
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Nov 10, 2011
I have the following sql query that on debugging contains what looks like the right thing however the database is not being updated, but the code runs fine:
con.Open()
For i = 8 To ds.Tables("AddressBook").Columns.Count - 1 'Counts the amount of columns in the database
[Code]....
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Jun 8, 2010
i am haveing problems updateing my customer details i was wondering if i could use the code i have for add and change it to update maby insted of useing the INSERT I could use a UPDATE or something anyway
Public Sub updateWithNewOrders(ByVal aOrder As Order)
Dim cmd4 As New OleDbCommand("INSERT INTO ORDER
(OrderID,CustomerID,OrderTotal,ODate,EmployeeId) VALUES (?, ?,?,?,?)", con)
[Code].....
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Nov 28, 2011
I have an field which i have to update based on the selection of listbox.When i select listbox based on that when i update my fiels it should be updated
Dim cnstring As String
cnString = "Provider=Microsoft.Jet.OLEDB.4.0;Persist Security Info=False;Data Source=AirLine.mdb"
Dim sqlQ As String = "SELECT NoofCoachseatsAvailable,NoofCoachSeatssold FROM FlightDetails WHERE flightname='" & s & "' "
'Create connection
[Code]...
Dynamic SQL generation for the UpdateCommand is not supported against a SelectCommand that does not return any key column information. Is my selection (Based on Listbox selection) is the wrong part here.
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Aug 11, 2010
the problem is when I click the 'save button' and then exit. Then open again, the total records still unchanged
the code used
Private Sub btnSave_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSave.Click
Validate()
Supplier_s_informationBindingSource.EndEdit()
Supplier_s_informationTableAdapter.Update(Bookster_databaseDataSet1._Supplier_s_information)
End Sub
then I try to put Me.
Private Sub btnSave_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSave.Click
Validate()
Supplier_s_informationBindingSource.EndEdit()
Me.Supplier_s_informationTableAdapter.Update(Me.Bookster_databaseDataSet1._Supplier_s_information)
End Sub
I don't know if make a difference but how to update the database also, what code should I put?
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Jun 15, 2012
Code for button:
Protected Sub btnAdd_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnAdd.Click
Dim li1 As ListItem
Dim addList As New List(Of ListItem)
[code]....
Updates are happening on the load of a dropdownbox This has something to do with autopostbacks and the page load I think, can someone please help When I click the add button even if I have selected an item in the listbox, it will always return an error message. I don't think the listbox changedselected item is firing.
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Nov 6, 2009
I'm having troubles with terminating an application. When I close the main form everything disappears but the process remains active. I think I know the cause, a certain activeX component will not release properly. As soon as I create one, I can't close normally...
dim someActiveXcomponent = new X()
...
<formClosing>
someActiveXcomponent = nothing
GC.Collect()
GC.WaitForPendingFinalizers ' here it hangs
Probably a bug in that component, but the problem is that I don't have much of a choice, I'll have to use that component for now.
Calling
System.Runtime.InteropServices.Marshal.ReleaseComO bject( myObject )
will kill the reference and now the application closes properly.
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