Trapping Edit & Update events from DetailsView button clicks

Question

On an ASP.Net / VB.Net DetailsView that allows inserts, edits, and deletes we would like to trap the event that occurs when a user clicks on the Edit button and the Update button of the DetailsView.

We are looking to trap these events with and event handler inside a VB.Net code-behind file.

Can you tell me with sample code how to do it?

* Update *

I tried this coding but get the following error when clicking on the Edit button:

Unable to cast object of type 'System.Web.UI.WebControls.DetailsView' 
to type 'System.Web.UI.WebControls.DetailsViewRow'.

This is the coding from the markup showing the Edit button:

<asp:DetailsView 
    ID="DetailsViewDetails" 
    runat="server" 
    AutoGenerateRows="False" 
    Height="50px" 
    Width="268px" 
    DataSourceID="SqlDataSourceDetails"
    DataKeyNames="ID"
    OnItemCommand="DetailsViewDetails_ItemCommand">

    <Fields>
        <asp:TemplateField ShowHeader="False">

            <EditItemTemplate>
                <asp:Button ID="ButtonUpdate" runat="server" CausesValidation="True" 
                    CommandName="Update" Text="Update"  />
                &nbsp;<asp:Button ID="ButtonCancelUpdate" runat="server" CausesValidation="False" 
                    CommandName="Cancel" Text="Cancel" />
            </EditItemTemplate>

            <InsertItemTemplate>
                <asp:Button ID="ButtonInsert" runat="server" CausesValidation="True" 
                    CommandName="Insert" Text="Insert" />
                &nbsp;<asp:Button ID="ButtonCancelInsert" runat="server" CausesValidation="False" 
                    CommandName="Cancel" Text="Cancel" />
            </InsertItemTemplate>

            <ItemTemplate>
                <asp:Button ID="ButtonEdit" runat="server" CausesValidation="False" 
                    CommandName="Edit" Text="Edit" />
                &nbsp;<asp:Button ID="ButtonNew" runat="server" CausesValidation="False" 
                    CommandName="New" Text="New" />
                &nbsp;<asp:Button ID="ButtonDelete" runat="server" CausesValidation="False" 
                    CommandName="Delete" Text="Delete" />

                    <AjaxToolKit:ConfirmButtonExtender ID="deleteButtonConfirmation" 
                        runat="server" 
                        ConfirmText='<%# "You are about to remove: " & vbcr & 
                            Eval("Forename") & vbcr & Eval("Surname") & "!!!" &
                            vbcrlf & "Are you sure you want to do this?" & vbcrlf &
                            "Clicking the OK button will delete this parent." %>'
                        Enabled="True" 
                        TargetControlID="ButtonDelete">

                    </AjaxToolKit:ConfirmButtonExtender>
            </ItemTemplate>
        </asp:TemplateField>

This is the handler in the code-behind file:

Protected Sub DetailsViewDetails_ItemCommand(sender As Object, e As System.Web.UI.WebControls.DetailsViewCommandEventArgs)
    Dim row As DetailsViewRow = DirectCast(DirectCast(e.CommandSource, Control).NamingContainer, DetailsViewRow)

    Select Case e.CommandName
        Case "Add"

        Case "Edit"
            ' Do this when going into edit mode so changes to the panent's tuition total balance can be updated.
            '---------------------------------------------------------------------------------------------------
            dcmOriginalRegistrationFee = GetValueFromTextBoxRegistrationFee()

        Case "Delete"

    End Select
End Sub

We get the error on the Dim statement.

Answer 1

You can use it's ItemCommand event with an appropriate CommandName:

<asp:DetailsView ID="DetailsView1" runat="server"  
    OnItemCommand="DetailsView1_ItemCommand" 
    <Fields>
       <asp:BoundField  DataField="IdField" HeaderText="ID" />
       <asp:BoundField  DataField="NameField" HeaderText="Name" />
       <asp:ButtonField CommandName="Add" Text="Add Something" />
       <asp:ButtonField CommandName="Edit" Text="EditSomething" />
       <asp:ButtonField CommandName="Delete" Text="Delete Something" />
    </Fields>
</asp:DetailsView>

in codebehind:

Protected Sub DetailsView1_ItemCommand(sender As Object, e As System.Web.UI.WebControls.DetailsViewCommandEventArgs)
    Select Case e.CommandName
        Case "Add"

        Case "Edit"

        Case "Delete"

    End Select
End Sub