[RESOLVED] Gridview with find control question

[newpat]

Dear all,
I can set all of the target button to disable, but I cannot change it to enable however I think my code must be right! Does anyone face the same question before?

aspx

<asp:GridView ID="gvEditEvent" OnRowEditing="gvEditEvent_Editing" runat="server" AutoGenerateColumns="False" CellPadding="4"
                                        DataSourceID="ObjectDataSource1" ForeColor="#333333" GridLines="None" OnRowUpdated="gvEditEvent_Updated" OnRowDataBound="gvEditEvent_RowDataBound">
                                        <FooterStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
                                        <RowStyle BackColor="#EFF3FB" />
                                        <Columns>
                                            <asp:TemplateField ShowHeader="False">
                                               <ItemTemplate>  
                                                    <asp:LinkButton ID="btnEdit" runat="server" CausesValidation="False" CommandName="Edit"  
                                                        Text="Edit"></asp:LinkButton>
                                                    <asp:LinkButton ID="btnUpdate" runat="server" CausesValidation="False" CommandName="Update"
                                                        Text="Update"></asp:LinkButton>
                                                    <asp:LinkButton ID="btnCancel" Visible="false" runat="server" CausesValidation="False" CommandName="Cancel"
                                                        Text="Cancel"></asp:LinkButton>
                                                        <asp:HiddenField ID="hfID" runat="server" Value='<&#37;# Bind("ID") %>'/> 
                                                </ItemTemplate>  
                                            </asp:TemplateField>           
                                            <asp:BoundField DataField="NAME" HeaderText="NAME" SortExpression="NAME" />                                        
                                            </Columns>                                        
                                        <PagerStyle BackColor="#2461BF" ForeColor="White" HorizontalAlign="Center" />
                                        <SelectedRowStyle BackColor="#D1DDF1" Font-Bold="True" ForeColor="#333333" />
                                        <HeaderStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
                                        <EditRowStyle BackColor="#2461BF" />
                                        <AlternatingRowStyle BackColor="White" />
                                    </asp:GridView>

.vb

    
    Protected Sub gvEditEvent_Editing(ByVal sender As Object, ByVal e As GridViewEditEventArgs)
        mpeEdit.Show()
        CType(gvEditEvent.Rows(e.NewEditIndex).Cells(0).FindControl("btnUpdate"), LinkButton).Enabled = True
    End Sub
    
    Protected Sub gvEditEvent_RowDataBound(ByVal sender As Object, ByVal e As GridViewRowEventArgs)
        For i As Integer = 0 To gvEditEvent.Rows.Count - 1
            CType(gvEditEvent.Rows(i).Cells(0).FindControl("btnUpdate"), LinkButton).Enabled = False
        Next
    End Sub

[danasegarane]

There are few things are to be noted here...

There is no need to loop through the Gridview Rows in gvEditEvent_RowDataBound Event as the RowDataBound will be fired for each rows .. And this code could be shortened

Protected Sub gvEditEvent_RowDataBound(ByVal sender As Object, ByVal e As GridViewRowEventArgs)
        For i As Integer = 0 To gvEditEvent.Rows.Count - 1
            CType(gvEditEvent.Rows(i).Cells(0).FindControl("btnUpdate"), LinkButton).Enabled = False
        Next
    End Sub

to

Protected Sub gvEditEvent_RowDataBound(ByVal sender As Object, ByVal e As GridViewRowEventArgs)
            CType(e.Row.FindControl("btnUpdate"), LinkButton).Enabled = False
    End Sub

And

Protected Sub gvEditEvent_Editing(ByVal sender As Object, ByVal e As GridViewEditEventArgs)
        mpeEdit.Show()
        CType(gvEditEvent.Rows(e.NewEditIndex).Cells(0).FindControl("btnUpdate"), LinkButton).Enabled = True
    End Sub

to

    Protected Sub GridView1_RowEditing(ByVal sender As System.Object, ByVal e As System.Web.UI.WebControls.GridViewEditEventArgs) Handles GridView1.RowEditing
        'Bind the Data
        'Set the Enable using

        CType(GridView1.Rows(e.NewEditIndex).FindControl("btnUpdate"), LinkButton).Enabled = True


    End Sub

[newpat]

Thx for the advice!!
but the debug tool tell me that CType(e.Row.FindControl("btnUpdate"), LinkButton).Enabled = False is NullReferenceException
and even I change the code like

CType(gvEditEvent.FindControl("btnUpdate"), LinkButton).Enabled = False

also, I have copied this code correctly to my vb

Protected Sub gvEditEvent_Editing(ByVal sender As Object, ByVal e As GridViewEditEventArgs) Handles gvEditEvent.RowEditing
        mpeEdit.Show()
        CType(gvEditEvent.Rows(e.NewEditIndex).FindControl("btnUpdate"), LinkButton).Enabled = True
    End Sub

after I clicked edit link button, but my btnUpdate button cannot be set to enable again...any idea?

[danasegarane]

Does the other part worked ?

Protected Sub gvEditEvent_RowDataBound(ByVal sender As Object, ByVal e As GridViewRowEventArgs)
            CType(e.Row.FindControl("btnUpdate"), LinkButton).Enabled = False
    End Sub

[newpat]

no, this gives out NullReferenceException, is there something wrong? but unless I can prove there is an object by using for loop

[danasegarane]

Oh Missed one part. You need to check like is it a DataRow.

Protected Sub GridView1_RowDataBound(ByVal sender As System.Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles GridView1.RowDataBound
        If (e.Row.RowType = DataControlRowType.DataRow) Then
            Dim linkButton As LinkButton = e.Row.FindControl("btnUpdate")
            If Not linkButton Is Nothing Then
                linkButton.Enabled = True
            End If
        End If
    End Sub

[newpat]

Ya, it's working perfect!
But the main function of when clicking the edit button, the target btnUpdate is not enable, is that one of the bug in asp.net?

Protected Sub gvEditEvent_Editing(ByVal sender As Object, ByVal e As GridViewEditEventArgs)
        mpeEdit.Show()'modal popup extender
        CType(gvEditEvent.Rows(e.NewEditIndex).Cells(0).FindControl("btnUpdate"), LinkButton).Enabled = True    
    End Sub

[dnanetwork]

http://aspspider.info/dnanetwork/

[newpat]

Something I forgot to say...I have a RequiredFieldValidator in my gridview so I need to make the update link button being not causesvalidation...here is my adviced solution, create a save button and make a cookie to save yr editing index:

Dim c As New HttpCookie("editRow", e.NewEditIndex)

so when u click the update button

Dim editRow As Integer = Request.Cookies("editRow").Value.ToString
gvEditEvent.UpdateRow(editRow, False)
btnSaveEditEvent.Enabled = False

simple!