Cant access button from behind code

Question

0.00/5 (No votes)

See more:

this behind code

VB

Protected Sub gvData_RowCommand(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewCommandEventArgs) Handles gvData.RowCommand
       'lblError.Text = ""

       Dim oButton As Button = fvData.FindControl("BtnRevisi")

       'Dim oTextbox As TextBox = DirectCast(Me.fvData.FindControl("txtRevisi"), TextBox)
       lblError.Visible = False
       If e.CommandName = "Select" Then
           fvData.ChangeMode(FormViewMode.Edit)
           fvData.Caption = "Edit Data"
           oButton.Visible = False
       End If
       If e.CommandName = "Revisi" Then

       End If

   End Sub

this is on html

ASP.NET

<pre><asp:FormView ID="fvData" runat="server" DataSourceID="sdsForm"
    DefaultMode="Edit" Width="100%" DataKeyNames="ID">
    <EditItemTemplate>
        <table cellpadding=0 cellspacing=0 width="100%">
            <tr>
                <td colspan="2">
                    <hr />
                </td>
            </tr>

            <tr>
                <td colspan="2">
                     </td>
            </tr>
            <tr>
                <td colspan="2" class="FooterStyle">
                    <uc1:BtnUpdate ID="BtnUpdate1" runat="server" />
                    <uc2:BtnDelete ID="BtnDelete1" runat="server" />
                    <uc3:BtnCancel ID="BtnCancel1" runat="server" />

                    <asp:Button ID="btnRevisi" runat="server" OnClick="btnSave_Click" Style="font-size: 8pt; cursor: pointer; background-position: left; background-image: url(../images/Save.gif); background-repeat: no-repeat; text-align: right;" Text="Revisi" ToolTip="Save" ValidationGroup="Pricing" Width="55px" />

                </td>
            </tr>
            <tr>
                <td colspan="2">
                    <hr />
                </td>
            </tr>
        </table>
    </EditItemTemplate>

in essence I just want to grab the id property from the btnRevisi, because the location of the btnRevisi is in the formview, so the id of the btnRevisi can not be called. and display error after the run is btnRevisi it is nothing Object reference not set to an instance of an object.

What I have tried:

I have declare by using DirectCast, the result is the same still (Object reference not set to an instance of an object). like this the code Dim oButton As Button = fvData.FindControl("btnRevisi")

oButton.Visible = False in this section its an error

Posted 9-May-18 23:49pm

Member 10843905

Updated 10-May-18 6:07am

Add a Solution

Comments

CHill60 10-May-18 6:03am

Has the button actually been rendered on the page when this code is being called?

Member 10843905 10-May-18 6:46am

yes, i think so. i mean this problem is how to get btnRevisi ID when I click command button in gridview

when CommandField click any error on this section
oButton.Visible = False

this code on gridview :
<asp:GridView ID="gvData" runat="server" AllowPaging="True" AllowSorting="True"
AutoGenerateColumns="False" DataSourceID="sdsGrid" Width="100%"
DataKeyNames="ID" Caption="PreCosting" RowHeaderColumn="ID">
<columns>

<asp:CommandField ButtonType="Image" SelectImageUrl="~/images/edit.gif" ShowSelectButton="True">
<ItemStyle Width="20px" HorizontalAlign="Center" />

<emptydatatemplate>
<uc6:NoDataFound ID="NoDataFound1" runat="server" />

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Richard Deeming · Answer 1 · 2018-05-10T06:09:00

The button you're trying to find is in the EditItemTemplate.

The controls in that template aren't created until the FormView is changed to "edit" mode and bound to its data source.

Something like this should work:

VB.NET

If e.CommandName = "Select" Then
    fvData.Caption = "Edit Data"
    fvData.ChangeMode(FormViewMode.Edit)
    fvData.DataBind()
    
    Dim oButton As Button = fvData.FindControl("btnRevisi")
    oButton.Visible = False
End If

However, if all you're doing is setting the visibility of the button, you can do that in the markup: