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Bulk update on a gridview scroll through gridview

Posted on 2006-10-24
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Last Modified: 2012-08-13
I'm using the code from http://msdn2.microsoft.com/en-us/library/ms404814.aspx to do a bulk update on a datagrid. Basicly you put text boxes in the item view, then click an update button which saves the data to a table scan trhough it to see if a row has changed then does a SQL update. For some reason currentID isn't increasing each time it runs through the for loop. It runs 4 times (I have 4 row in my grid view, but the ID does not change on each time through.

    Protected Sub UpdateButton_Click1(ByVal sender As Object, ByVal e As System.EventArgs) Handles UpdateButton.Click
        originalDataTable = CType(ViewState("originalValuesDataTable"), System.Data.DataTable)
        For Each r As GridViewRow In GridView1.Rows
            If IsRowModified(r) = True Then
                Dim currentID As Integer
                Dim currentQuantity As String
                Dim currentsellprice As String
                Dim currentUnitCost As String
                Dim currentSystemSale As Boolean
                currentID = Convert.ToInt32(GridView1.DataKeys(0).Value)
                Dim row As System.Data.DataRow = originalDataTable.Select(String.Format("OrderDetailID = {0}", currentID))(0)
                currentQuantity = CType(r.FindControl("QuantityTextBox"), TextBox).Text
                currentsellprice = CType(r.FindControl("sellpriceTextBox"), TextBox).Text
                currentUnitCost = CType(r.FindControl("UnitCostTextBox"), TextBox).Text
                currentSystemSale = CType(r.FindControl("chkSystemSale"), CheckBox).Checked
                Dim sqlcmd As String = "UPDATE OrderDetails SET Quantity = '" & currentQuantity & "', SellPrice = convert(money,'" & currentsellprice & "'), UnitCost = convert(money,'" & currentUnitCost & "'), SystemSale = '" & System.Convert.ToInt32(currentSystemSale) & "' WHERE OrderDetailID = '" & currentID & "'"
                Dim connectionString As String = WebConfigurationManager.ConnectionStrings("dbPointsConnectionString").ConnectionString
                Dim conn As New SqlConnection(connectionString)
                Dim cmd As New SqlCommand(sqlcmd, conn)
                Using conn
                    conn.Open()
                    cmd.ExecuteScalar()
                End Using
            End If
        Next
        ' Rebind the Grid to repopulate the original values table.
        tableCopied = False
        GridView1.DataBind()
    End Sub

    Protected Function IsRowModified(ByVal r As GridViewRow) As Boolean
        Dim currentID As Integer
        Dim currentQuantity As String
        Dim currentsellprice As String
        Dim currentUnitCost As String
        Dim currentSystemSale As Boolean
        currentID = Convert.ToInt32(GridView1.DataKeys(0).Value)
        currentQuantity = CType(r.FindControl("QuantityTextBox"), TextBox).Text
        currentsellprice = CType(r.FindControl("sellpriceTextBox"), TextBox).Text
        currentUnitCost = CType(r.FindControl("UnitCostTextBox"), TextBox).Text
        currentSystemSale = CType(r.FindControl("chkSystemSale"), CheckBox).Checked

        Dim row As System.Data.DataRow = originalDataTable.Select(String.Format("OrderDetailID = {0}", currentID))(0)

        Dim x As String
        x = row("sellprice")
        If Not currentQuantity.Equals(row("Quantity").ToString()) Then Return True
        If Not currentsellprice.Equals(row("sellprice").ToString()) Then Return True
        If Not currentUnitCost.Equals(row("UnitCost").ToString()) Then Return True
        If Not currentSystemSale.Equals(row("SystemSale").ToString()) Then Return True

        Return False
    End Function
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Question by:kevlause
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4 Comments
 
LVL 96

Expert Comment

by:Bob Learned
ID: 17797787
You are always getting the key from the first row:

GridView1.DataKeys(0)

Bob
0
 

Author Comment

by:kevlause
ID: 17797801
Isn't that just the first datakey as in if you name more than one datakey?
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LVL 96

Accepted Solution

by:
Bob Learned earned 500 total points
ID: 17797822
No, the DataKeys array stores the key values for each row:

http://msdn2.microsoft.com/en-us/library/system.web.ui.webcontrols.gridview.datakeys.aspx

Example:

Sub CustomersGridView_SelectedIndexChanged(ByVal sender As Object, ByVal e As EventArgs)
     
    ' Determine the index of the selected row.
    Dim index As Integer = CustomersGridView.SelectedIndex
       
    ' Display the primary key value of the selected row.
    Message.Text = "The primary key value of the selected row is " & _
        CustomersGridView.DataKeys(index).Value.ToString() & "."
   
  End Sub

Bob
0
 

Author Comment

by:kevlause
ID: 17798176
Ok that's it, but I don't understand why it works on the example on this site, but not for me. I got around it by using a session variable and increaseing it by one then setting it back to 0 when I was done.
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