asp.net listview and findcontrol - asp.net

Question

I have listview and i need to bind the dropdown list in the list view to ListItemCollection which will be built using a function BindPages().
When I clicked on the AddNew Link I am not able to bind the dropdown.
<asp:ListView DataKeyNames="Menuid" OnItemCommand="lvParentMenus_ItemCommand" OnSorting="lvParentMenus_Sorting"
OnDataBound="lvParentMenus_DataBound" DataSourceID="SqlDataSource1" ID="lvParentMenus"
runat="server">
<LayoutTemplate>
<table border="0" id="listview" width="100%" class="grid" cellpadding="0" cellspacing="0">
<thead>
<tr class="listingheader ">
<td width="10%" style="text-align: center; !important">
<input type="checkbox" name="checkbox" id="headercheck" />
</td>
<td id="thsno" runat="server">
<asp:LinkButton ID="LinkButton1" runat="server" CommandName="Sort" CommandArgument="Sno"
Text="Sno" />
</td>
<td id="thmenutext" runat="server">
<asp:LinkButton runat="server" ID="LinkButton2" Text="Menu Text" CommandName="Sort"
CommandArgument="MenuText" />
</td>
<td id="thmenuurl" runat="server">
<asp:LinkButton runat="server" ID="LinkButton3" Text="Menu Url" CommandName="Sort"
CommandArgument="MenuUrl" />
</td>
<td id="thlevel" runat="server">
<asp:LinkButton runat="server" ID="LinkButton4" Text="Level of Display" CommandName="Sort"
CommandArgument="level" />
</td>
<td>
Action
</td>
</tr>
</thead>
<tbody>
<tr runat="server" id="itemPlaceholder">
</tr>
</tbody>
<tfoot>
<tr>
<td colspan="3" align="center">
<asp:Label ID="lblMessage" Text="dfdfdfd" runat="server"></asp:Label>
</td>
<td align="right">
<asp:LinkButton Text="Add New" ID="lnkNew" CommandName="FillDropDown" runat="server"
Font-Bold="true" OnClick="AddNew"></asp:LinkButton>
</td>
</tr>
</tfoot>
</table>
<ItemTemplate>
<tr class='<%# Container.DataItemIndex % 2 == 0 ? "lrow1" : "lrow1 altrow" %>'>
<td class="col1" align="center">
<asp:CheckBox runat="server" ID="chkitem"></asp:CheckBox>
</td>
<td class="lrow1">
<%# Eval("Sno")%>
<asp:HiddenField ID="hdnStoreID" runat="server" Value='<%# Eval("MenuId") %>' />
</td>
<td>
<%# Eval("MenuText")%>
</td>
<td>
<asp:DropDownList ID="ddlPagesList" runat="server" DataSource='<%#BindPages()%>'>
</asp:DropDownList>
</td>
<td>
<asp:DropDownList ID="ddlLevel" runat="server" DataSource='<%#BindLevel(6)%>' SelectedValue='<%# Eval("level")%>'>
</asp:DropDownList>
</td>
<td nowrap="nowrap">
<asp:LinkButton ID="lnkEdit" runat="server" CommandName="Edit">Edit</asp:LinkButton>
|
<asp:LinkButton ID="lnkdelete" runat="server" CommandName="Delete" OnClientClick="javascript:return confirm('Are you sure to delete the current item');">Delete</asp:LinkButton>
</td>
</tr>
</ItemTemplate>
<InsertItemTemplate>
<tr class="lrow1">
<td class="col1" align="center">
</td>
<td class="lrow1">
</td>
<td class="lrow1">
<asp:TextBox ID="txtMenuText" runat="server" Width="80px" Text='<%# Eval("MenuText")%>'
CssClass="inputbox" ValidationGroup="InsertFields" />
<asp:RequiredFieldValidator ID="reqValidCity" ControlToValidate="txtMenuText" runat="server"
ErrorMessage="City Name is required." Display="Dynamic" ValidationGroup="InsertFields">*</asp:RequiredFieldValidator>
<asp:RegularExpressionValidator ID="regValidCity" runat="server" ErrorMessage="Please Enter Alphabets only."
Display="Dynamic" ValidationGroup="g1" ControlToValidate="txtMenuText" ValidationExpression="^[a-zA-Z0-9\s]{2,1000}"></asp:RegularExpressionValidator>
</td>
<td>
<asp:DropDownList ID="ddlPagesList" runat="server" DataSource='<%#BindPages()%>'>
</asp:DropDownList>
</td>
<td>
<asp:DropDownList ID="ddlLevel" runat="server" DataSourceID="sdsLevel" DataValueField="level"
DataTextField="level">
</asp:DropDownList>
</td>
<td nowrap="nowrap">
<asp:LinkButton ID="lnkinsert" runat="server" OnClick="lnkinsert_Click" ValidationGroup="InsertFields"> Insert</asp:LinkButton>
</td>
</tr>
</InsertItemTemplate>
</asp:ListView>
<asp:SqlDataSource ID="SqlDataSource1" runat="server" SelectCommand="usp_getParentMenus"
SelectCommandType="StoredProcedure">
<SelectParameters>
<asp:ControlParameter ControlID="ddlRoles" Name="intRoleid" PropertyName="Text" DefaultValue="1"
ConvertEmptyStringToNull="true" Direction="Input" />
</SelectParameters>
</asp:SqlDataSource>
and here is the method BindPAges()
protected ListItemCollection BindPages()
{
string sDir = Request.PhysicalApplicationPath;
if (FirstCount == 0)
DirSearch(sDir);
return collection;
}
When I tried to find the ddlPageList in the AddNew() method it is throwing error "Object referenc not set "
AddNEw() Method:
` protected void AddNew(object sender, EventArgs e)
{
lvParentMenus.InsertItemPosition = InsertItemPosition.FirstItem;
lvParentMenus.FindControl("lnkNew").Visible = false;
lvParentMenus.EditIndex = -1;
sdsLevel.ConnectionString = DBConnectionString.ConnectionString;
Parameter a = new Parameter("intRoleid", DbType.Int32);
a.DefaultValue = ddlRoles.SelectedValue.ToString();
sdsLevel.SelectParameters.Add(a);
sdsLevel.SelectCommand = "usp_getParentMenus";
DropDownList ddlpages = (DropDownList)lvParentMenus.FindControl("ddlPagesList");
string sDir = Request.PhysicalApplicationPath;
DirSearch(sDir);
ddlpages.DataSource = collection;
ddlpages.DataBind();
}
Need urgently.
Thanks.

Answer 1

Please try
DropDownList ddlpages = (DropDownList)lvParentMenus.Items[0].FindControl("ddlPagesList");

Answer 2

Have you tried to use runat=server property in TABLE in Listview?