VB.NET DataSet Update - vb.net

Question

Why my set of codes didn't update in DataSet? Then it goes to Error. Please anyone check this code and point me out where I am missing. Thanks in advance!
Private Sub btnUpdate_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnUpdate.Click
Dim conxMain As New SqlConnection("Data Source=SERVER;Initial Catalog=DBTest;Persist Security Info=True;User ID=username;Password=pwds")
Dim dadPurchaseInfo As New SqlDataAdapter
Dim dsPurchaseInfo As New DataSet1
Try
Dim dRow As DataRow
conxMain.Open()
Dim cmdSelectCommand As SqlCommand = New SqlCommand("SELECT * FROM Stock", conxMain)
cmdSelectCommand.CommandTimeout = 30
dadPurchaseInfo.SelectCommand = cmdSelectCommand
Dim builder As SqlCommandBuilder = New SqlCommandBuilder(dadPurchaseInfo)
dadPurchaseInfo.Fill(dsPurchaseInfo, "Stock")
For Each dRow In dsPurchaseInfo.Tables("Stock").Rows
If CInt(dRow.Item("StockID").ToString()) = 2 Then
dRow.Item("StockCode") = "Re-Fashion[G]"
End If
Next
dadPurchaseInfo.Update(dsPurchaseInfo, "Stock")
Catch ex As Exception
MsgBox("Error : ")
Finally
If dadPurchaseInfo IsNot Nothing Then
dadPurchaseInfo.Dispose()
End If
If dsPurchaseInfo IsNot Nothing Then
dsPurchaseInfo.Dispose()
End If
If conxMain IsNot Nothing Then
conxMain.Close()
conxMain.Dispose()
End If
End Try
End Sub

Answer 1

Does your condition in the loop get executed (set a break point!)? Where is the error thrown? What error?
Also, why does it use ToString at all? This seems redundant.
If CInt(dRow.Item("StockID")) = 2 Then
Should be enough.
Finally, you’re performing redundant cleanup:
If conxMain IsNot Nothing Then
conxMain.Close()
conxMain.Dispose()
End If
Dispose implies Close – no need to perform both operations:
Close and Dispose are functionally equivalent.
[Source: MSDN]

Answer 2

Does your dataAdapter has update command ?
(it looks like it doesn't - so it doesn't know what do to with update....)
Here is an Update Command example:(for an employee table with 3 columns - as listed below:
UPDATE [Employee]
SET [name] = #name
, [manager] = #manager
WHERE (([id] = #Original_id) AND
((#IsNull_name = 1 AND [name] IS NULL) OR
([name] = #Original_name)) AND
((#IsNull_manager = 1 AND [manager] IS NULL) OR
([manager] = #Original_manager)));
SELECT id
, name
, manager
FROM Employee
WHERE (id = #id)
You can see it is a general update that can handle changes in any field.

Answer 3

I got it from the error correction of my program by Konard Rudolph!
Private Sub btnUpdate_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnUpdate.Click
Dim conxMain As New SqlConnection("Data Source=SERVER;Initial Catalog=DBTest;Persist Security Info=True;User ID=username;Password=pwds")
Dim dadPurchaseInfo As New SqlDataAdapter
Dim dsPurchaseInfo As New DataSet1
Try
Dim dRow As DataRow
conxMain.Open()
dadPurchaseInfo.SelectCommand = New SqlCommand("SELECT * FROM Stock", conxMain)
Dim builder As SqlCommandBuilder = New SqlCommandBuilder(dadPurchaseInfo)
dadPurchaseInfo.Fill(dsPurchaseInfo, "Stock")
For Each dRow In dsPurchaseInfo.Tables("Stock").Rows
If CInt(dRow.Item("StockID")) = 2 Then
dRow.Item("StockCode") = "Re-Fashion(H)"
End If
Next
dadPurchaseInfo.Update(dsPurchaseInfo, "Stock")
Catch ex As Exception
MsgBox("Error : " & vbCrLf & ex.Message)
Finally
If dadPurchaseInfo IsNot Nothing Then
dadPurchaseInfo.Dispose()
End If
If dsPurchaseInfo IsNot Nothing Then
dsPurchaseInfo.Dispose()
End If
If conxMain IsNot Nothing Then
conxMain.Dispose()
End If
End Try
End Sub
The above set of code work to update with DataSet! Thanks to stackoverflow community and who answered my question.
Here is ref:
How To Update a SQL Server Database by Using the SqlDataAdapter Object in Visual Basic .NET
How to update a database from a DataSet object by using Visual Basic .NET
p.s: Like o.k.w said : The Table must have primary key. Thanks o.k.w!

Answer 4

--MENU--
Dim login As New LoginClass
login.ShowDialog()
--CONEXION--
Private conec As SqlConnection
Dim stringCon As String = "Data Source= ;Initial Catalog=;Persist Security Info=True;User ID=;Password="
Public ReadOnly Property prConec() As Object
Get
Return conec
End Get
End Property
Public Sub Conectar()
Try
conec = New SqlConnection(stringCon)
If conec.State <> ConnectionState.Open Then
conec.Open()
End If
Catch ex As Exception
MessageBox.Show(ex.Message)
End Try
End Sub
--BUSCAR--
funciones.Conectar()
Dim coman As New SqlCommand("sp_cliente", funciones.prConec)
Dim dt As New DataTable
coman.CommandType = CommandType.StoredProcedure
coman.Parameters.Add("#i_operacion", SqlDbType.Char, 1, ParameterDirection.Input).Value = "B"
dt.Load(coman.ExecuteReader())
grdClientes.DataSource = dt
--INSERTAR--
funciones.Conectar()
Dim coman As New SqlCommand("sp_articulo", funciones.prConec)
coman.CommandType = CommandType.StoredProcedure
coman.Parameters.Add("#i_operacion", SqlDbType.Char, 1, ParameterDirection.Input).Value = "I"
coman.ExecuteNonQuery()
Buscar()
Limpiar()
--COMBO--
Dim dt As New DataTable
dt.Columns.Add("Codigo")
dt.Columns.Add("Descripcion")
Dim dr1 As DataRow = dt.NewRow
dr1.Item("Codigo") = "A"
dr1.Item("Descripcion") = "Activo"
dt.Rows.Add(dr1)
Dim dr2 As DataRow = dt.NewRow
dr2.Item("Codigo") = "I"
dr2.Item("Descripcion") = "Inactivo"
dt.Rows.Add(dr2)
cmbEstado.DataSource = dt
cmbEstado.ValueMember = "Codigo"
cmbEstado.DisplayMember = "Descripcion"
--GRIDVIEW--
--1--
Dim grdFila As DataGridViewRow = grdClientes.CurrentRow
txtCedula.Text = grdFila.Cells(0).Value
--2--
If DataGridProductos.CurrentCell.ColumnIndex = 0 Then
Dim FLstArticulos As New FLstArticulos
FLstArticulos.ShowDialog()
DataGridProductos.CurrentRow.Cells(0).Value = FLstArticulos.PrIdArticulo
End If
--GRIDVIEW.CELLENDEDIT--
If DataGridProductos.CurrentCell.ColumnIndex = 3 Then
Dim precio As New Double
Dim cantidad As New Double
precio = CDbl(grdRow.Cells(2).Value)
cantidad = CDbl(grdRow.Cells(3).Value)
DataGridProductos.CurrentRow.Cells(4).Value = PLTotalFilaItem(cantidad, precio)
PLCargaTotales()
End If
Sub PLCargaTotales()
Dim subTotal As Double
Dim iva As Double
For Each grd As DataGridViewRow In DataGridProductos.Rows
If Not String.IsNullOrEmpty(grd.Cells(4).Value) Then
subTotal = subTotal + CDbl(grd.Cells(4).Value)
End If
Next grd
txtSubtotal.Text = subTotal.ToString
iva = Decimal.Round(subTotal`enter code here` * 0.12)
txtIva.Text = iva.ToString
txtTotalPagar.Text = (subTotal + iva).ToString
End Sub