Is it possible to get the value of a control inside listview on page load?

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var test = ((HiddenField)lstDetails.FindControl("HiddenField1")).Value;

But i get error "Object reference not set to an instance of an object."

Thanks in advance.

XML

<asp:ListView ID="lstDetails" runat="server" ItemPlaceholderID="itemPlaceHolder"
                                     OnSelectedIndexChanging="lstDetails_SelectedIndexChanging"
                                     OnSelectedIndexChanged="lstDetails_SelectedIndexChanged" >

                                    <LayoutTemplate>
                                        <table style="width:1074px;">
                                            <thead>
                                                <tr class="tableHead">
                                                    <th style="text-align: center; width: 35px;">Sl</th>
                                                    <th style="text-align: center; width: 850px;">Leave Approval</th>
                                                </tr>
                                            </thead>
                                            <tbody>
                                                <asp:PlaceHolder ID="itemPlaceHolder" runat="server"></asp:PlaceHolder>
                                            </tbody>
                                        </table>
                                    </LayoutTemplate>
                                    <ItemTemplate>
                                        <table class="tablemain" style="position:relative; left:66px;">
                                            <tr>
                                                <td>

                                                </td>
                                            </tr>
                                            <tr >
                                                <td class="tablecontentTitleSmall">Leave #</td>
                                                <td class="tablecontent">
                                                    <asp:HiddenField ID="hfSearchID" Value='<%#Eval("EssDocAppNo") %>' runat="server" />
                                                    <asp:TextBox ID="txtID" runat="server" CssClass="formTextBox" Text='<%#Eval("leave#") %>' Enabled="false"></asp:TextBox>
                                                </td>
                                                <td class="tablecontentTitleSmall">Employee Name</td>
                                                <td colspan="5" class="tablecontent">
                                                    <asp:TextBox ID="txtEmployeeName" runat="server" CssClass="formTextBox" Text='<%#Eval("FullName") %>' Enabled="false" Width="668px"></asp:TextBox>
                                                </td>
                                            </tr>
                                            <tr>
                                                <td class="tablecontentTitleSmall">Date
                                                </td>
                                                <td class="tablecontent">
                                                    <asp:TextBox ID="txtApplyDate" runat="server" CssClass="formTextBox" Text='<%#Eval("ladate") %>' Enabled="false"></asp:TextBox>
                                                </td>
                                                <td class="tablecontentTitleSmall">From
                                                </td>
                                                <td class="tablecontent">
                                                    <asp:TextBox ID="txtFromDate" runat="server" CssClass="formTextBox" Text='<%#Eval("leavestart") %>' Enabled="false"></asp:TextBox>
                                                </td>
                                                <td class="tablecontentTitleSmall">To
                                                </td>
                                                <td class="tablecontent">
                                                    <asp:TextBox ID="txttoDate" runat="server" CssClass="formTextBox" Text='<%#Eval("leaveend") %>' Enabled="false"></asp:TextBox>
                                                </td>
                                                <td class="tablecontentTitleSmall">No of Days
                                                </td>
                                                <td class="tablecontent"  style="width:63px;">
                                                    <asp:TextBox ID="txtNoofDays" runat="server" CssClass="formTextBox" Text='<%#Eval("noofdays") %>' Enabled="false"></asp:TextBox>
                                                </td>
                                            </tr>
                                            <tr>
                                                <td class="tablecontentTitleSmall"></td>
                                                <td class="tablecontent">
                                                     <span>
                                                <asp:ImageButton ID="imgApprove" Width="30" Height="30" ToolTip="Approve" OnClick="imgApprove_Click" CommandName="Select"  CommandArgument="approve" ImageUrl="~/Styles/images/Approve.png" PostBackUrl='#' runat="server" /></span>

                                            <span>
                                                <asp:ImageButton ID="imgDenied" Width="30" Height="30" ToolTip="Deny" CommandName="Select" CommandArgument="deny" ImageUrl="~/Styles/images/Denied.png" PostBackUrl='#' runat="server" /></span>
                                                </td>
                                                <td class="tablecontentTitleSmall">Reason
                                                </td>
                                                <td class="tablecontent">
                                                    <asp:DropDownList ID="ddlReason" runat="server" Width="130px" CssClass="formTextBox">
                                                        <asp:ListItem>Eligible</asp:ListItem>
                                                        <asp:ListItem>Not Eligible</asp:ListItem>
                                                    </asp:DropDownList>
                                                </td>
                                                <td colspan="4" class="tablecontent">
                                                    <asp:TextBox ID="txtComment" runat="server" CssClass="formTextBox" Width="520px" TextMode="MultiLine"></asp:TextBox>
                                                </td>

                                            </tr>
                                        </table>
                                        <div style="height: 1px; width: 1007px; background-color: black; position: relative; left: 67px">
                                        </div>
                                    </ItemTemplate>
                                </asp:ListView>

/////////////////////////////////////////////////////////////////////////

select d.EssDocAppNo,(e.EmpFName+' '+ e.EmpMName+' '+e.EmpLName)as FullName,(l.essdoccode+' '+CONVERT(varchar(10), l.EssLaNo))as leave# ,l.ladate,l.leavestart,l.leaveend,l.noofdays from MstEmployee e,EssTrnLeaveApplication l,EssTrnDocumentApproval d,UtlWorkFlow w where l.EmpCode=4092 and e.EmpCode=4092and e.EmpCode=4092 and d.ApprovalStatus='P' and w.Authority1=2068;

Posted 12-Dec-14 20:35pm

Kochathu Thomas Tinu

Updated 12-Dec-14 21:21pm

v3

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Comments

DamithSL 13-Dec-14 2:41am

where you data bind to listview?

Kochathu Thomas Tinu 13-Dec-14 2:48am

Yes. bind values to list view. I need to know that the value in the hidden field is possible to get on page load. The hidden field in is kept in the ListView.

DamithSL 13-Dec-14 2:58am

without see the code it is difficult to tell, if the control loaded and data bind operation completed and also you have added hidden field in correct template ( if you add in edit template then you can get the control in edit mode only etc..)
then there is a possibility of finding your control. but we don't have access to your code or read your mind :)

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 13-Dec-14 3:15am

You posted the mark up. DamithSL is asking for binding code.

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DamithSL · Answer 1 · 2014-12-12T21:24:00

Solution 1

you have hidden field called hfSearchID but you searching for HiddenField1. correct that first.
after you binding data try below

C#

var test = ((HiddenField)lstDetails.Items[0].FindControl("hfSearchID")).Value;

note that you have hidden fields for each item, above will give the first list item hidden control

Posted 12-Dec-14 21:24pm

DamithSL

Comments

Kochathu Thomas Tinu 13-Dec-14 3:34am

i am just given as a test name not the actual name

var EssDocAppNo = ((HiddenField)lstDetails.Items[0].FindControl("hfSearchID")).Value;

i used the same code but the value is always showing null.

Kochathu Thomas Tinu 13-Dec-14 5:29am

Thanks DamithSL for ur support. I solved it myself

DamithSL 13-Dec-14 5:32am

Glad to hear that, Self learner :)
why don't you post your findings as new answer. in future it will help to someone with slimier issue.