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POasp.net listview and findcontrol
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  1. POasp.net listview and findcontrol
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    copied!<p>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.</p> <pre><code>&lt;asp:ListView DataKeyNames="Menuid" OnItemCommand="lvParentMenus_ItemCommand" OnSorting="lvParentMenus_Sorting" OnDataBound="lvParentMenus_DataBound" DataSourceID="SqlDataSource1" ID="lvParentMenus" runat="server"&gt; &lt;LayoutTemplate&gt; &lt;table border="0" id="listview" width="100%" class="grid" cellpadding="0" cellspacing="0"&gt; &lt;thead&gt; &lt;tr class="listingheader "&gt; &lt;td width="10%" style="text-align: center; !important"&gt; &lt;input type="checkbox" name="checkbox" id="headercheck" /&gt; &lt;/td&gt; &lt;td id="thsno" runat="server"&gt; &lt;asp:LinkButton ID="LinkButton1" runat="server" CommandName="Sort" CommandArgument="Sno" Text="Sno" /&gt; &lt;/td&gt; &lt;td id="thmenutext" runat="server"&gt; &lt;asp:LinkButton runat="server" ID="LinkButton2" Text="Menu Text" CommandName="Sort" CommandArgument="MenuText" /&gt; &lt;/td&gt; &lt;td id="thmenuurl" runat="server"&gt; &lt;asp:LinkButton runat="server" ID="LinkButton3" Text="Menu Url" CommandName="Sort" CommandArgument="MenuUrl" /&gt; &lt;/td&gt; &lt;td id="thlevel" runat="server"&gt; &lt;asp:LinkButton runat="server" ID="LinkButton4" Text="Level of Display" CommandName="Sort" CommandArgument="level" /&gt; &lt;/td&gt; &lt;td&gt; Action &lt;/td&gt; &lt;/tr&gt; &lt;/thead&gt; &lt;tbody&gt; &lt;tr runat="server" id="itemPlaceholder"&gt; &lt;/tr&gt; &lt;/tbody&gt; &lt;tfoot&gt; &lt;tr&gt; &lt;td colspan="3" align="center"&gt; &lt;asp:Label ID="lblMessage" Text="dfdfdfd" runat="server"&gt;&lt;/asp:Label&gt; &lt;/td&gt; &lt;td align="right"&gt; &lt;asp:LinkButton Text="Add New" ID="lnkNew" CommandName="FillDropDown" runat="server" Font-Bold="true" OnClick="AddNew"&gt;&lt;/asp:LinkButton&gt; &lt;/td&gt; &lt;/tr&gt; &lt;/tfoot&gt; &lt;/table&gt; &lt;ItemTemplate&gt; &lt;tr class='&lt;%# Container.DataItemIndex % 2 == 0 ? "lrow1" : "lrow1 altrow" %&gt;'&gt; &lt;td class="col1" align="center"&gt; &lt;asp:CheckBox runat="server" ID="chkitem"&gt;&lt;/asp:CheckBox&gt; &lt;/td&gt; &lt;td class="lrow1"&gt; &lt;%# Eval("Sno")%&gt; &lt;asp:HiddenField ID="hdnStoreID" runat="server" Value='&lt;%# Eval("MenuId") %&gt;' /&gt; &lt;/td&gt; &lt;td&gt; &lt;%# Eval("MenuText")%&gt; &lt;/td&gt; &lt;td&gt; &lt;asp:DropDownList ID="ddlPagesList" runat="server" DataSource='&lt;%#BindPages()%&gt;'&gt; &lt;/asp:DropDownList&gt; &lt;/td&gt; &lt;td&gt; &lt;asp:DropDownList ID="ddlLevel" runat="server" DataSource='&lt;%#BindLevel(6)%&gt;' SelectedValue='&lt;%# Eval("level")%&gt;'&gt; &lt;/asp:DropDownList&gt; &lt;/td&gt; &lt;td nowrap="nowrap"&gt; &lt;asp:LinkButton ID="lnkEdit" runat="server" CommandName="Edit"&gt;Edit&lt;/asp:LinkButton&gt; | &lt;asp:LinkButton ID="lnkdelete" runat="server" CommandName="Delete" OnClientClick="javascript:return confirm('Are you sure to delete the current item');"&gt;Delete&lt;/asp:LinkButton&gt; &lt;/td&gt; &lt;/tr&gt; &lt;/ItemTemplate&gt; &lt;InsertItemTemplate&gt; &lt;tr class="lrow1"&gt; &lt;td class="col1" align="center"&gt; &amp;nbsp; &lt;/td&gt; &lt;td class="lrow1"&gt; &amp;nbsp; &lt;/td&gt; &lt;td class="lrow1"&gt; &lt;asp:TextBox ID="txtMenuText" runat="server" Width="80px" Text='&lt;%# Eval("MenuText")%&gt;' CssClass="inputbox" ValidationGroup="InsertFields" /&gt; &lt;asp:RequiredFieldValidator ID="reqValidCity" ControlToValidate="txtMenuText" runat="server" ErrorMessage="City Name is required." Display="Dynamic" ValidationGroup="InsertFields"&gt;*&lt;/asp:RequiredFieldValidator&gt; &lt;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}"&gt;&lt;/asp:RegularExpressionValidator&gt; &lt;/td&gt; &lt;td&gt; &lt;asp:DropDownList ID="ddlPagesList" runat="server" DataSource='&lt;%#BindPages()%&gt;'&gt; &lt;/asp:DropDownList&gt; &lt;/td&gt; &lt;td&gt; &lt;asp:DropDownList ID="ddlLevel" runat="server" DataSourceID="sdsLevel" DataValueField="level" DataTextField="level"&gt; &lt;/asp:DropDownList&gt; &lt;/td&gt; &lt;td nowrap="nowrap"&gt; &lt;asp:LinkButton ID="lnkinsert" runat="server" OnClick="lnkinsert_Click" ValidationGroup="InsertFields"&gt; Insert&lt;/asp:LinkButton&gt; &lt;/td&gt; &lt;/tr&gt; &lt;/InsertItemTemplate&gt; &lt;/asp:ListView&gt; &lt;asp:SqlDataSource ID="SqlDataSource1" runat="server" SelectCommand="usp_getParentMenus" SelectCommandType="StoredProcedure"&gt; &lt;SelectParameters&gt; &lt;asp:ControlParameter ControlID="ddlRoles" Name="intRoleid" PropertyName="Text" DefaultValue="1" ConvertEmptyStringToNull="true" Direction="Input" /&gt; &lt;/SelectParameters&gt; &lt;/asp:SqlDataSource&gt; </code></pre> <p>and here is the method BindPAges()</p> <pre><code> protected ListItemCollection BindPages() { string sDir = Request.PhysicalApplicationPath; if (FirstCount == 0) DirSearch(sDir); return collection; } </code></pre> <p>When I tried to find the ddlPageList in the AddNew() method it is throwing error "Object referenc not set "</p> <p>AddNEw() Method: ` protected void AddNew(object sender, EventArgs e) {</p> <pre><code> 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; </code></pre> <p>ddlpages.DataBind(); }</p> <p><img src="https://i.stack.imgur.com/fEAvT.png" alt="In the image after clicking on the new link button I need to bind the dropdown to the list of pages in the dirctory.But it is not coming."></p> <p>Need urgently. Thanks.</p>
 

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