Error message: Object reference not set to an instance of an object.
Stack trace: at Telerik.Web.UI.RadComboBox.OnInit(EventArgs e)
at System.Web.UI.Control.InitRecursive(Control namingContainer)
at System.Web.UI.Control.AddedControl(Control control, Int32 index)
at Telerik.Web.UI.GridPagerItem.InitializePagerItem(GridColumn[] columns)
at Telerik.Web.UI.GridPagerItem.SetupItem(Boolean dataBind, Object dataItem, GridColumn[] columns, ControlCollection rows)
at Telerik.Web.UI.GridTableView.CreateTopPagerItem(Boolean useDataSource, GridColumn[] copiedColumnSet, Boolean isPagingEnabled, GridTHead thead)
at Telerik.Web.UI.GridTableView.CreateControlHierarchy(Boolean useDataSource)
at Telerik.Web.UI.GridTableView.CreateChildControls(IEnumerable dataSource, Boolean useDataSource)
at System.Web.UI.WebControls.CompositeDataBoundControl.CreateChildControls()
at System.Web.UI.Control.EnsureChildControls()
at Telerik.Web.UI.GridTableView.get_Items()
at Telerik.Web.UI.GridTableView.GetSelectedItems()
at XXX.StudentSearch_PreRender(Object sender, EventArgs e) in C:\XXX\StudentSearch.aspx.vb:line 140
at System.EventHandler.Invoke(Object sender, EventArgs e)
at System.Web.UI.Control.PreRenderRecursiveInternal()
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
Private Sub StudentSearch_PreRender(sender As Object, e As System.EventArgs) Handles Me.PreRender If grd.MasterTableView.GetSelectedItems.Count > 0 And grd.Visible Then tab.Visible = True mp.Visible = True Else tab.Visible = False mp.Visible = False End If End SubBelow is the definite for the RadGrid:
<telerik:RadGrid ID="grd" runat="server" AutoGenerateColumns="False" CellSpacing="0" GridLines="None" AllowPaging="True" PageSize="20" Width="600px"> <ClientSettings> <Selecting AllowRowSelect="False" /> </ClientSettings> <MasterTableView HierarchyDefaultExpanded="false" HierarchyLoadMode="ServerOnDemand" DataKeyNames="StudentUID"> <CommandItemSettings ExportToPdfText="Export to PDF"></CommandItemSettings> <RowIndicatorColumn FilterControlAltText="Filter RowIndicator column"> <HeaderStyle Width="20px"></HeaderStyle> </RowIndicatorColumn> <ExpandCollapseColumn FilterControlAltText="Filter ExpandColumn column"> <HeaderStyle Width="20px"></HeaderStyle> </ExpandCollapseColumn> <Columns> <telerik:GridButtonColumn CommandName="Select" FilterControlAltText="Filter column column" Text="Open" UniqueName="column" ButtonType="ImageButton" ImageUrl="Images/Open.gif"> <ItemStyle Width="20px" /> </telerik:GridButtonColumn> <telerik:GridBoundColumn DataField="StudentID" FilterControlAltText="Filter column1 column" HeaderText="Student ID" UniqueName="column1"> </telerik:GridBoundColumn> <telerik:GridBoundColumn DataField="LastName" FilterControlAltText="Filter column2 column" HeaderText="Last Name" UniqueName="column2"> </telerik:GridBoundColumn> <telerik:GridBoundColumn DataField="FirstName" FilterControlAltText="Filter column4 column" HeaderText="First Name" UniqueName="column4"> </telerik:GridBoundColumn> <telerik:GridBoundColumn DataField="Middle" FilterControlAltText="Filter column3 column" HeaderText="Middle" UniqueName="column3"> </telerik:GridBoundColumn> </Columns> <EditFormSettings> <EditColumn FilterControlAltText="Filter EditCommandColumn column"> </EditColumn> </EditFormSettings> </MasterTableView> <FilterMenu EnableImageSprites="False"> </FilterMenu> <HeaderContextMenu CssClass="GridContextMenu GridContextMenu_Default"> </HeaderContextMenu> </telerik:RadGrid>2 Answers, 1 is accepted
Rank 2
Iron
Hi,
the error seems not so generic... the problem is in the pager with a page size combobox (NextPrevAndNumeric) after a postback ... why? It's your job.
I solved forcing DataSource = "" instead the standard DataSource=Nothing if I not load a source object collection due some logics.
Best Regards
Rank 1
Your solution saved my day. Thanks alot.
Best Regards,
Pradeep Yamujala.
Rank 2
Your solution saved my day as well. Thanks alot.
so the trick here is:
Instead of
grid.datasource=Nothing
just do
grid.datasource = ""
Best Regards,
Frank
Rank 1
Solved my problem too ! After 4 hours of searching
Rank 2
Iron
Best Regards,
Andrea
Rank 1
Rank 1
Rank 1
I upgraded from 2011 Q1 to 2013 Q3, and pages that were previously working were falling over. I couldn't figure out what was happening. I started to re-piece my AJAX logic step by step but couldn't isolate the reason for the error.
I do find it hard to believe that 12 months and 3 releases later that this issue hasn't been fixed by Telerik. Very disappointing.
Could you please elaborate what are the exact issues you are facing after the upgrade? The upgrade you have performed is rather big and a lot of changes and new features and functionality are implemented during this period. Therefore providing the explanation of the exact issue you are facing and the error you are currently getting will help us point you to the right direction in fixing the problem.
Regards,
Maria Ilieva
Telerik
Rank 1
since 1.5 days I was facing this problem and you saved my life.
Rank 1
I just placed it inside of the RadGrid's DataBind handler
if (RadGrid == null) //By the end of the DataBind function
RadGrid.DataSource = ""
Rank 1
For anyone else who is experiencing this issue, please hear me out.
Setting the Grid's data source to "null" / "Nothing" in the NeedDataSource event is not the correct approach and has never been.
The Grid relies on the column structure/schema for multiple reasons, so the data source you assign to it must contain the structure (whether or not it's empty).
One good reason is when the "AutoGenerateColumns" is set to "True" the columns are generated automatically. That cannot happen without a data source that contains the necessary schema/structure.
<telerik:RadGrid ID="RadGrid1" runat="server" OnNeedDataSource="RadGrid1_NeedDataSource">
<MasterTableView AutoGenerateColumns="True">
</MasterTableView>
</telerik:RadGrid>In this case, setting "null" as the data source will not render the Grid structure at all. All you will see is the borders of the Grid element.
Example screenshot
Assigning an empty data source that has structure will render the Grid, the columns and show the "No records to display"
Example screenshot
Correct approach
Within the NeedDataSource event, if you want to set an "EMPTY" data source to the Grid, make sure the data source itself contains the structure.
Example using an empty DataTable object for this specific structure
C#
protected void RadGrid1_NeedDataSource(object sender, GridNeedDataSourceEventArgs e)
{
RadGrid grid = (RadGrid) sender;
DataTable dt = new DataTable();
dt.Columns.Add("OrderID", typeof(int));
dt.Columns.Add("ShipName", typeof(string));
dt.Rows.Add(1, "Name 1");
dt.Rows.Add(2, "Name 2");
dt.Rows.Add(3, "Name 3");
if (true)
{
// data source with records
grid.DataSource = dt;
}
else
{
// empty data source - Clone() copies only the DataTable's structure
grid.DataSource = dt.Clone();
}
}VB
Protected Sub RadGrid1_NeedDataSource(ByVal sender As Object, ByVal e As GridNeedDataSourceEventArgs)
Dim grid As RadGrid = CType(sender, RadGrid)
Dim dt As DataTable = New DataTable()
dt.Columns.Add("OrderID", GetType(Integer))
dt.Columns.Add("ShipName", GetType(String))
dt.Rows.Add(1, "Name 1")
dt.Rows.Add(2, "Name 2")
dt.Rows.Add(3, "Name 3")
If True Then
'data source with records
grid.DataSource = dt
Else
'empty data source - Clone() copies only the DataTable's structure
grid.DataSource = dt.Clone()
End If
End Sub
Example using an empty Custom object for this specific structure
C#
protected void RadGrid1_NeedDataSource(object sender, GridNeedDataSourceEventArgs e)
{
RadGrid grid = (RadGrid) sender;
List<MyCustomObject> myList = new List<MyCustomObject>();
myList.Add(new MyCustomObject() { OrderID = 1, ShipName = "Name 1" });
myList.Add(new MyCustomObject() { OrderID = 2, ShipName = "Name 2" });
myList.Add(new MyCustomObject() { OrderID = 3, ShipName = "Name 3" });
if (true)
{
grid.DataSource = myList;
}else
{
grid.DataSource = new List<MyCustomObject>();
}
}VB
Protected Sub RadGrid1_NeedDataSource(ByVal sender As Object, ByVal e As GridNeedDataSourceEventArgs)
Dim grid As RadGrid = CType(sender, RadGrid)
Dim myList As List(Of MyCustomObject) = New List(Of MyCustomObject)()
myList.Add(New MyCustomObject() With {
.OrderID = 1,
.ShipName = "Name 1"
})
myList.Add(New MyCustomObject() With {
.OrderID = 2,
.ShipName = "Name 2"
})
myList.Add(New MyCustomObject() With {
.OrderID = 3,
.ShipName = "Name 3"
})
If True Then
grid.DataSource = myList
Else
grid.DataSource = New List(Of MyCustomObject)()
End If
End SubIf the issue appears with this approach, then we can consider it a bug and assign the developers to investigate it.
Regards,
Attila Antal
Progress Telerik
Rank 2
Iron
I apologize, I simply corrected a typo in an old comment of mine, the new forum has done the magic..... and the rest is history.
I think that in 2024 no one is still facing this problem.
Sorry
It's alright Andrea, do not feel bad.
This Forum post popped up in our System and thought I would clarify the correct approach in case anyone else experiences the same issue or even other issues that are caused by setting the Grid's data source to "null" just to clear the data source (e.g. provide and empty source).
Can you elaborate on how is the grid bound and where are the RadTabStrip and RadMultiPage defined?
Greetings,
Iana Tsolova
the Telerik team
<h2>Student Search</h2><telerik:RadToolBarID="tbr"runat="server"Width="100%"><Items><telerik:RadToolBarButtonrunat="server"Text="Search"Value="Search"ImageUrl="Images/find.png"></telerik:RadToolBarButton><telerik:RadToolBarButtonrunat="server"Text="Clear"Value="Clear"ImageUrl="Images/clear.gif"></telerik:RadToolBarButton></Items></telerik:RadToolBar><table><tr><td>Student ID:</td><td><asp:TextBoxID="txtStudentID"runat="server"Width="85px"></asp:TextBox></td><td>Last Name:</td><td><asp:TextBoxID="txtLastName"runat="server"Width="85px"></asp:TextBox></td><td>First Name:</td><td><asp:TextBoxID="txtFirstName"runat="server"Width="85px"></asp:TextBox></td><td>Middle:</td><td><asp:TextBoxID="txtMiddle"runat="server"Width="30px"></asp:TextBox></td></tr></table><table><tr><tdvalign="top"><telerik:RadGridID="grd"runat="server"AutoGenerateColumns="False"CellSpacing="0"GridLines="None"AllowPaging="True"PageSize="20"Width="600px"><ClientSettings><SelectingAllowRowSelect="False"/></ClientSettings><MasterTableViewHierarchyDefaultExpanded="false"HierarchyLoadMode="ServerOnDemand"DataKeyNames="StudentUID"><CommandItemSettingsExportToPdfText="Export to PDF"></CommandItemSettings><RowIndicatorColumnFilterControlAltText="Filter RowIndicator column"><HeaderStyleWidth="20px"></HeaderStyle></RowIndicatorColumn><ExpandCollapseColumnFilterControlAltText="Filter ExpandColumn column"><HeaderStyleWidth="20px"></HeaderStyle></ExpandCollapseColumn><Columns><telerik:GridButtonColumnCommandName="Select"FilterControlAltText="Filter column column"Text="Open"UniqueName="column"ButtonType="ImageButton"ImageUrl="Images/Open.gif"><ItemStyleWidth="20px"/></telerik:GridButtonColumn><telerik:GridBoundColumnDataField="StudentID"FilterControlAltText="Filter column1 column"HeaderText="Student ID"UniqueName="column1"></telerik:GridBoundColumn><telerik:GridBoundColumnDataField="LastName"FilterControlAltText="Filter column2 column"HeaderText="Last Name"UniqueName="column2"></telerik:GridBoundColumn><telerik:GridBoundColumnDataField="FirstName"FilterControlAltText="Filter column4 column"HeaderText="First Name"UniqueName="column4"></telerik:GridBoundColumn><telerik:GridBoundColumnDataField="Middle"FilterControlAltText="Filter column3 column"HeaderText="Middle"UniqueName="column3"></telerik:GridBoundColumn></Columns><EditFormSettings><EditColumnFilterControlAltText="Filter EditCommandColumn column"></EditColumn></EditFormSettings></MasterTableView><FilterMenuEnableImageSprites="False"></FilterMenu><HeaderContextMenuCssClass="GridContextMenu GridContextMenu_Default"></HeaderContextMenu></telerik:RadGrid></td><tdwidth="400px"valign="top"><telerik:RadTabStripID="tab"runat="server"MultiPageID="mp"><Tabs><telerik:RadTabrunat="server"Text="Info"PageViewID="Info"></telerik:RadTab><telerik:RadTabrunat="server"Text="Forms"PageViewID="Forms"></telerik:RadTab></Tabs></telerik:RadTabStrip><telerik:RadMultiPageID="mp"runat="server"BorderColor="#7E7E7E"BorderStyle="Solid"BorderWidth="1px"><telerik:RadPageViewID="Info"runat="server"><table><tr><tdstyle="text-align: right; font-weight: bold">First Name:</td><td><asp:LabelID="lblFirstName"runat="server"Text=""></asp:Label></td></tr><tr><tdstyle="text-align: right; font-weight: bold">Last Name:</td><td><asp:LabelID="lblLastName"runat="server"Text=""></asp:Label></td></tr><tr><tdstyle="text-align: right; font-weight: bold">Middle:</td><td><asp:LabelID="lblMiddle"runat="server"Text=""></asp:Label></td></tr><tr><tdstyle="text-align: right; font-weight: bold">Student ID:</td><td><asp:LabelID="lblStudentID"runat="server"Text=""></asp:Label></td></tr><tr><tdstyle="text-align: right; font-weight: bold">Address:</td><td><asp:LabelID="lblAddress1"runat="server"Text=""></asp:Label></td></tr><tr><td></td><td><asp:LabelID="lblAddress2"runat="server"Text=""></asp:Label></td></tr><tr><tdstyle="text-align: right; font-weight: bold">City:</td><td><asp:LabelID="lblCity"runat="server"Text=""></asp:Label></td></tr><tr><tdstyle="text-align: right; font-weight: bold">State:</td><td><asp:LabelID="lblState"runat="server"Text=""></asp:Label></td></tr><tr><tdstyle="text-align: right; font-weight: bold">Zip Code:</td><td><asp:LabelID="lblZipCode"runat="server"Text=""></asp:Label></td></tr><tr><tdstyle="text-align: right; font-weight: bold">County:</td><td><asp:LabelID="lblCounty"runat="server"Text=""></asp:Label></td></tr><tr><tdstyle="text-align: right; font-weight: bold">Email:</td><td><asp:LabelID="lblEmail"runat="server"Text=""></asp:Label></td></tr><tr><tdstyle="text-align: right; font-weight: bold">Phone:</td><td><asp:LabelID="lblPhone"runat="server"Text=""></asp:Label></td></tr><tr><tdstyle="text-align: right; font-weight: bold">Major:</td><td><asp:LabelID="lblMajor"runat="server"Text=""></asp:Label></td></tr></table></telerik:RadPageView><telerik:RadPageViewID="Forms"runat="server"><telerik:RadTreeViewID="trvForms"runat="server"><Nodes><telerik:RadTreeNoderunat="server"Text="Faculty Concern Alert Forms"Value="FacultyConcernForms"PostBack="false"></telerik:RadTreeNode><telerik:RadTreeNoderunat="server"Text="FERPA Releases"Value="FERPAReleases"PostBack="false"></telerik:RadTreeNode><telerik:RadTreeNoderunat="server"Text="Medical Response Plan"Value="MedicalResponsePlan"></telerik:RadTreeNode><telerik:RadTreeNoderunat="server"Text="Rate My Advisor"Value="RateMyAdvisor"PostBack="false"></telerik:RadTreeNode><telerik:RadTreeNoderunat="server"Text="Scholarship Application"Value="ScholarshipApp"></telerik:RadTreeNode><telerik:RadTreeNoderunat="server"Owner="trvForms"Text="Student Accommodations"Value="StudentAccommodations"></telerik:RadTreeNode><telerik:RadTreeNoderunat="server"Text="Petitions for Academic Proficiency Examination"Value="ProfExamPetition"></telerik:RadTreeNode><telerik:RadTreeNoderunat="server"Text="Petitions for Alternative Academic Credit"Value="AltAcadCreditPetition"></telerik:RadTreeNode><telerik:RadTreeNoderunat="server"Text="Course Addition Requests"Value="CourseAdditionRequest"></telerik:RadTreeNode></Nodes></telerik:RadTreeView></telerik:RadPageView></telerik:RadMultiPage></td></tr></table>PrivateSubgrd_NeedDataSource(senderAsObject, eAsTelerik.Web.UI.GridNeedDataSourceEventArgs)Handlesgrd.NeedDataSourceIftxtFirstName.Text =""AndAlsotxtLastName.Text =""AndAlsotxtMiddle.Text =""AndAlsotxtStudentID.Text =""Thengrd.DataSource =Nothinggrd.Visible =FalseElsegrd.Visible =TrueIfIsNothing(Cache("StudentSearchResults:"& Session.SessionID))ThenCache("StudentSearchResults:"& Session.SessionID) = Searcher.FindStudents(txtFirstName.Text, txtLastName.Text, txtMiddle.Text, txtStudentID.Text)EndIfgrd.DataSource = Cache("StudentSearchResults:"& Session.SessionID)EndIfEndSubReviewing your full code I find everything properly set up. To further isolate the issue, can you specify if the error come when the grid is visible or when it is not visible and what do you have in the Cache object at that time?
Greetings,
Iana Tsolova
the Telerik team
Thanks,
Adam
I have a similar problem for a few days now, but can't find any solutions on the web. I follow the Telerik sample code from this link:
http://demos.telerik.com/aspnet-ajax/grid/examples/hierarchy/nestedviewtemplate/defaultcs.aspx
But after a exactly two successful postbacks, it starts throwing fatal error: "Object reference not set to an instance of an object", which implies the logic in code is OK, and the connections between parent and child tables are OK as well.
Please also see the attachment for the screenshot of my app, it shows two expanded child records, as soon as i try to expand the third record (third postback), it crashes with the "Object reference not set to an instance of an object" error.
Could some of the Telerik experts out there solve this problem.
Here are the page markup and code behind:
// ------------------ the page --------------------------
< %@ Page Title="" Language="C#" MasterPageFile="~/Master/LoanServ.Master" AutoEventWireup="true" CodeBehind="CustomerDashboard.aspx.cs" Inherits="LWT.LoanServ.Customers.CustomerDashboard" %>< %@ Register TagPrefix="telerik" Namespace="Telerik.Web.UI" Assembly="Telerik.Web.UI" %><asp:ContentID="Content1"ContentPlaceHolderID="cphHead"runat="server"><scriptrunat="server">< /script><styletype="text/css">.viewWrap{padding: 15px;background: #2291b5 0 0 url(Img/bluegradient.gif) repeat-x;}.contactWrap{padding: 10px 15px 15px 15px;background: #fff;color: #333;}.contactWrap td{padding: 0 20px 0 0;}.contactWrap td td{padding: 3px 20px 3px 0;}.contactWrap img{border: 1px solid #05679d;}< /style>< /asp:Content><asp:ContentID="Content2"ContentPlaceHolderID="cphMain"runat="server">< !-- content start --><telerik:RadAjaxManagerID="RadAjaxManager1"runat="server"><AjaxSettings><telerik:AjaxSettingAjaxControlID="rgCustomer "><UpdatedControls><telerik:AjaxUpdatedControlControlID="rgCustomer "LoadingPanelID="RadAjaxLoadingPanel1"/>< /UpdatedControls>< /telerik:AjaxSetting>< /AjaxSettings>< /telerik:RadAjaxManager><telerik:RadAjaxLoadingPanelID="RadAjaxLoadingPanel1"runat="server"/><telerik:RadGridID="rgCustomer"DataSourceID="SqlDataSource1"runat="server"Width="95%"AutoGenerateColumns="False"PageSize="7"AllowSorting="True"AllowPaging="True"GridLines="None"ShowStatusBar="true"OnDetailTableDataBind="rgCustomer_DetailTableDataBind"OnItemCommand="rgCustomer_ItemCommand"OnItemCreated="rgCustomer_ItemCreated"OnPreRender="rgCustomer_PreRender"><PagerStyleMode="NumericPages"></PagerStyle><MasterTableViewDataSourceID="SqlDataSource1"DataKeyNames="CustomerID"AllowMultiColumnSorting="True"Width="100%"><Columns><telerik:GridBoundColumnSortExpression="CustomerID"HeaderText="CustomerID"HeaderButtonType="TextButton"DataField="CustomerID"Resizable="True"Reorderable="True"/><telerik:GridBoundColumnSortExpression="FirstName"HeaderText="First Name"HeaderButtonType="TextButton"DataField="FirstName"Resizable="True"Reorderable="True"/><telerik:GridBoundColumnSortExpression="LastName"HeaderText="Last Name"HeaderButtonType="TextButton"DataField="LastName"Resizable="True"Reorderable="True"/><telerik:GridBoundColumnSortExpression="Email"HeaderText="Email"HeaderButtonType="TextButton"DataField="Email"Resizable="True"Reorderable="True"/><telerik:GridBoundColumnSortExpression="Phone"HeaderText="Phone"HeaderButtonType="TextButton"DataField="Phone"Resizable="True"Reorderable="True"/><telerik:GridBoundColumnSortExpression="Mobile"HeaderText="Phone"HeaderButtonType="TextButton"DataField="Mobile"Resizable="True"Reorderable="True"/>< /Columns><NestedViewTemplate><asp:Panelrunat="server"ID="pnlInnerContainer"CssClass="viewWrap"Visible="false"><telerik:RadTabStriprunat="server"ID="TabStip1"MultiPageID="Multipage1"SelectedIndex="0"><Tabs><telerik:RadTabrunat="server"Text="Accounts"PageViewID="pvAccounts">< /telerik:RadTab><telerik:RadTabrunat="server"Text="Contact Information"PageViewID="pvContactDetails">< /telerik:RadTab><telerik:RadTabrunat="server"Text="Product Info"PageViewID="pvProducts">< /telerik:RadTab>< /Tabs>< /telerik:RadTabStrip><telerik:RadMultiPagerunat="server"ID="Multipage1"SelectedIndex="0"RenderSelectedPageOnly="false"><telerik:RadPageViewrunat="server"ID="pvAccounts"><telerik:RadGridID="rgAccounts"runat="server"Width="95%"AutoGenerateColumns="False"PageSize="7"AllowSorting="True"AllowPaging="True"GridLines="None"ShowStatusBar="true"OnItemCreated="rgAccounts_ItemCreated"OnNeedDataSource="rgAccounts_NeedDataSource"><MasterTableViewDataKeyNames="AccountID"AllowMultiColumnSorting="True"Width="100%"><Columns><telerik:GridBoundColumnSortExpression="AccountNumber"HeaderText="Account Number"HeaderButtonType="TextButton"DataField="AccountNumber"Resizable="True"Reorderable="True"/><telerik:GridBoundColumnSortExpression="SettlementDate"HeaderText="Settlement Date"HeaderButtonType="TextButton"DataField="SettlementDate"Resizable="True"Reorderable="True"/><telerik:GridBoundColumnSortExpression="CloseDate"HeaderText="Close Date"HeaderButtonType="TextButton"DataField="CloseDate"Resizable="True"Reorderable="True"/><telerik:GridBoundColumnSortExpression="AccountName"HeaderText="Account Name"HeaderButtonType="TextButton"DataField="AccountName"Resizable="True"Reorderable="True"/>< /Columns>< /MasterTableView>< /telerik:RadGrid>< /telerik:RadPageView><telerik:RadPageViewrunat="server"ID="pvContactDetails"Width="460px"><divclass="contactWrap"id="divContact"><tablecellpadding="0"cellspacing="0"><tr><td>< /td><td><asp:DetailsViewID="dvAddress"AllowPaging="true"GridLines="None"Width="100%"runat="server"Font-Italic="true"AutoGenerateRows="false"OnPageIndexChanging="dvAddress_PageIndexChanging"><Fields><asp:BoundFieldHeaderStyle-Font-Italic="false"HeaderStyle-Font-Size="Large"HeaderText="Address Type:"DataField="AddressType"HeaderStyle-Font-Bold="true"/><asp:BoundFieldHeaderStyle-Font-Italic="false"HeaderText="Address1:"DataField="Address1"HeaderStyle-Font-Bold="true"/><asp:BoundFieldHeaderText="Address2:"DataField="Address2"HeaderStyle-Font-Italic="false"HeaderStyle-Font-Bold="true"/><asp:BoundFieldHeaderText="Suburb:"DataField="Suburb"HeaderStyle-Font-Italic="false"HeaderStyle-Font-Bold="true"/><asp:BoundFieldHeaderText="State:"DataField="State"HeaderStyle-Font-Italic="false"HeaderStyle-Font-Bold="true"/><asp:BoundFieldHeaderText="Post Code:"DataField="PostCode"HeaderStyle-Font-Italic="false"HeaderStyle-Font-Bold="true"/>< /Fields>< /asp:DetailsView>< /td>< /tr>< /table>< /div>< /telerik:RadPageView><telerik:RadPageViewrunat="server"ID="pvProducts"><telerik:RadGridID="rgProducts"runat="server"Width="95%"AutoGenerateColumns="False"PageSize="7"AllowSorting="True"AllowPaging="True"GridLines="None"ShowStatusBar="true"><MasterTableViewDataKeyNames="AccountID"AllowMultiColumnSorting="True"Width="100%"><Columns><telerik:GridBoundColumnSortExpression="AccountNumber"HeaderText="Account Number"HeaderButtonType="TextButton"DataField="AccountNumber"Resizable="True"Reorderable="True"/><telerik:GridBoundColumnSortExpression="SettlementDate"HeaderText="Settlement Date"HeaderButtonType="TextButton"DataField="SettlementDate"Resizable="True"Reorderable="True"/><telerik:GridBoundColumnSortExpression="CloseDate"HeaderText="Close Date"HeaderButtonType="TextButton"DataField="CloseDate"Resizable="True"Reorderable="True"/><telerik:GridBoundColumnSortExpression="AccountName"HeaderText="Account Name"HeaderButtonType="TextButton"DataField="AccountName"Resizable="True"Reorderable="True"/>< /Columns>< /MasterTableView>< /telerik:RadGrid>< /telerik:RadPageView>< /telerik:RadMultiPage>< /asp:Panel>< /NestedViewTemplate>< /MasterTableView>< /telerik:RadGrid><asp:SqlDataSourceID="SqlDataSource1"runat="server"SelectCommand="lmsGetCustomers"SelectCommandType="StoredProcedure"OnSelected="SqlDataSource1_Selected"><SelectParameters><asp:ParameterName="iOrgID"Type="String"DefaultValue=""/><asp:ParameterName="iProfileID"Type="String"DefaultValue=""/>< /SelectParameters>< /asp:SqlDataSource><asp:SqlDataSourceID="SqlDataSource2"runat="server"SelectCommand="lmsGetAddressesByCustomer"SelectCommandType="StoredProcedure"OnSelected="SqlDataSource2_Selected"><SelectParameters><asp:ParameterName="iCustomerID"Type="String"DefaultValue="7"/>< /SelectParameters>< /asp:SqlDataSource>< /asp:Content>// ------------------ code behind --------------------------
using System;using System.Collections.Generic;using System.Web;using System.Web.UI;using System.Web.UI.WebControls;using System.Data;using LWT.Common.DAL;using Telerik.Web.UI;namespace LWT.LoanServ.Customers{public partial class CustomerDashboard : System.Web.UI.Page{private int _ExpandedParentId;public int ExpandedParentId{get { return _ExpandedParentId; }set { _ExpandedParentId = value; }}protected void Page_PreRenderComplete(object sender, EventArgs e){if (!Page.IsPostBack){try{//rgCustomer.MasterTableView.Items[0].Expanded = true;}// in case nothing returnedcatch (Exception ex){ }}}protected void rgCustomer_PreRender(object sender, EventArgs e){if (!Page.IsPostBack){//rgCustomer.MasterTableView.Items[0].Expanded = true;//rgCustomer.MasterTableView.Items[0].ChildItem.FindControl("pnlInnerContainer").Visible = true;}}protected void Page_Load(object sender, EventArgs e){LWT.LoanServ.Master.LoanServ master = (LWT.LoanServ.Master.LoanServ)Master;master.ProfileID = 1;master.SideMenuType = LWT.LoanServ.Biz.Common.SideMenu.Customer;string s;s = LWTDatabase.GetInstance().GetConnectionString("LoanServ");SqlDataSource1.ConnectionString = s;/*SqlDataSource1.SelectCommand = "GetAccountFacilities";SqlDataSource1.SelectCommandType = SqlDataSourceCommandType.StoredProcedure;*/SqlDataSource1.SelectParameters["iOrgID"].DefaultValue = "1";SqlDataSource1.SelectParameters["iProfileID"].DefaultValue = "1";SqlDataSource2.ConnectionString = s;//SqlDataSource2.SelectParameters["iCustomerID"].DefaultValue = "7";}protected void SqlDataSource1_Selected(object sender, SqlDataSourceStatusEventArgs e){int returned = e.AffectedRows;//SqlDataSource2.SelectParameters[0].DefaultValue = "985314";}protected void SqlDataSource2_Selected(object sender, SqlDataSourceStatusEventArgs e){int returned = e.AffectedRows;}protected void rgCustomer_ItemCommand(object source, GridCommandEventArgs e){try{if (e.CommandName == RadGrid.ExpandCollapseCommandName){RadGrid grid = (RadGrid)((GridDataItem)e.Item).ChildItem.FindControl("rgAccounts");string customerIDColumn = rgCustomer.MasterTableView.DataKeyNames[0].ToString();int customerID = LWT.Common.LWTSafeTypes.SafeInt(e.Item.OwnerTableView.Items[e.Item.ItemIndex][customerIDColumn].Text);ExpandedParentId = customerID; //new Guid(e.Item.OwnerTableView.Items[e.Item.ItemIndex][customerIDColumn].Text);DataSet ds = LWT.LoanServ.DAL.Customer.GetCustomerAccounts(null, customerID);grid.DataSource = ds.Tables[0];grid.DataBind();//grid.Visible = true;DetailsView detailsView = (DetailsView)((GridDataItem)e.Item).ChildItem.FindControl("dvAddress");DataSet dsAddr = LWT.LoanServ.DAL.Customer.GetCustomerAddresses(null, customerID);detailsView.DataSource = dsAddr.Tables[0];detailsView.DataBind();}}catch (Exception ex){string s = ex.Message;}}protected void rgCustomer_ItemCreated(object sender, GridItemEventArgs e){if (e.Item is GridCommandItem && e.Item.OwnerTableView != rgCustomer.MasterTableView){// GridCommandItem item = e.Item as GridCommandItem;// Label label = e.Item.FindControl("ParentIdValue") as Label;// label.Text = ExpandedParentId.ToString();}}protected void rgAccounts_ItemCreated(object sender, GridItemEventArgs e){try{RadGrid innerGrid = sender as RadGrid;GridDataItem parentItem = (innerGrid.NamingContainer as GridNestedViewItem).ParentItem;string s = parentItem.GetDataKeyValue("CustomerID").ToString();innerGrid.Visible = true;Panel pnl = innerGrid.Parent.Parent.Parent as Panel;pnl.Visible = true;}catch (Exception ex){string s = ex.Message;}}protected void rgAccounts_NeedDataSource(object sender, GridNeedDataSourceEventArgs e){RadGrid innerGrid = sender as RadGrid;GridDataItem parentItem = (innerGrid.NamingContainer as GridNestedViewItem).ParentItem;}protected void Accounts_NeedDataSource(object source, Telerik.Web.UI.GridNeedDataSourceEventArgs e){string s;s = LWTDatabase.GetInstance().GetConnectionString("LoanServ");SqlDataSource2.ConnectionString = s;SqlDataSource2.SelectCommand = "lmsGetAccountsByCustomer";SqlDataSource2.SelectCommandType = SqlDataSourceCommandType.StoredProcedure;SqlDataSource2.SelectParameters["iCustomerID"].DefaultValue = "1";//rgCustomer.MasterTableView.DetailTables[0].DataSource = null;}protected void dvAddress_PageIndexChanging(Object sender, System.Web.UI.WebControls.DetailsViewPageEventArgs e){//dvAddress.PageIndex = e.NewPageIndex ;//dvAddress.DataSource = membersAdapter.GetMembers()//dvAddress.DataBind();try{DetailsView dv = (DetailsView)sender;}catch (Exception ex){string s = ex.Message;}}}}The exception you receive is a server-side error. So if you disable ajax and run the page in debug mode (with F5), the application should break to the problematic line and thus you should be able to see which is the exact null object.
Kind regards,
Iana Tsolova
the Telerik team
Could you please elaborate a bit more in what scenario the mentioned error appears. Providing some part of your markup and the related code behind will help us provide more to-the-point solution.
All the best,
Maria Ilieva
the Telerik team
call stack: Telerik.Web.UI.DLL!Telerik.Web.UI.RadComboBox.OnInit(..)
is it related to paging and the comboBox that show the number of results? (otherwise, not sure from where this combobox comes in my radgrid)
In this case i have only one page of data.
As I asked several times in my posts it will be more helpful if you could provide your page markup as well as the related code behind so we could further research on the problem. The error is a generic one so without having an option to even review your code will be rather difficult to isolate the root cause of the issue.
Kind regards,
Maria Ilieva
the Telerik team