Cannot Update The Database Using Datagridview Correctly

Sep 28, 2010

I'm facing a problem while updating data in a database through datagridview. I'm changing the cells using a for loop and then updating db using below code. All data rows get updated but 1 (the last one).

Here is the code I'm using :To load data:

ds = New DataSet
cmd = New SqlCommand(query, cn)

[code]....

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[Code]...

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I have an application doing the following:

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my Problem comes after changing a value in the products DataGridView:

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Dim con As New SqlConnection("Data Source=.SQLExpress;Initial Catalog=MyDb;Integrated Security=True")
Dim cmd As SqlCommand

[code].....

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Here is my code, but its the other way around, it commits changes to the datagridview when the database is updated.

Imports System
Imports System.Data
Imports System.Data.OleDb [code]............

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I am filling my datagridview with the code below

Dim trh
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Dim pt As

[Code].....

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I'm using DataAdaptors to pull data into a DataGridView. I want to make changes to the data via my DataGridView and then update the database when the user clicks the 'Update' button, but I can't figure it out. Below is my code.

[Code]...

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[Code]....

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[code]...

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I�m trying to make a simple database editor using DataGridView.I have one DataGridView containing a lot of data on products and some parameters on how they should be tested. Some of these parameters, for example "Test method", is just a number. But if I look in the table for Test Methods that number has lots of other parameters. So if I select a "Test Method" Cell and click a button that table opens in a new form with just that "Test Method" (if I for example have selected a cell with the number 1, Test Method 1 will be shown in the new form). So far everything I�ve said works. I can even change values and update it to database in the first "Products" table. So here is the problem The DataGridView that shows the products is bound to a table and always shows the same thing which makes it easy to change and update using the following code

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"InvalidOperationException" "Update requires a valid UpdateCommand when passed DataRow collection with modified rows."

It seems like the problem is that because I change the data under run its not really bound to the database. And I haven�t found any complete solution to this. I have found some similiar problems and it seems I need to update each row using the command

TableAdapter.Update(DataRow)

Here follows the entire code for showing the Parameter Table in a DataGridView. This does not work.

Public Class Form3
'ID is the value from the cell selected in the Products table
Dim ID As Integer

[code]....

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Dim myQuery = "UPDATE table1 SET data= CONCAT (data,'" & vbCrLf & "[ " & Date.Now() & " ]" & " " & "[" & getCN() & "]" & " " & txtTelenotes.Text & "[ item1 ]" & "') WHERE id='" & txtID.Text & "'"

[code].....

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Dim ConnString As String = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:UsersHaidarDesktopcustomer listNewFarahnetFarahnetCustomers.mdb"
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[Code]...

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[Code]...

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Private Sub cmdCharge_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdCharge.Click
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[code]....

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[Code] .....

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[Code]...

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[Code].....

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