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GridTemplateColumn causing "Object reference not set to an instance of an object"

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This is a migrated thread and some comments may be shown as answers.

Brad asked on 27 Dec 2013, 12:22 AM

UnhandledException-GridTemplateCol.jpg

Hello,

I've been searching for a solution to my problem, but it appears that my issue is unique.

I have had a working web site using RadGrid grid controls for several years until yesterday. Orginally, this was developed in a 2008 version of Telerik Radcontrols, but I have recently updated it to Version=2013.3.1015.35 to run on a soon-to-be sunset-ed web server. This upgrade occurred in October or so and things have been fine until a few days ago.

I had to make a change some C# logic that had been discovered to be wrong. Once the code was tested and approved, the changes were pushed to the production server. A few days later, it was discovered that there was a problem adding records to the back-end database and having the grid redraw itself. In fact, the error seems to be coming from the client since it is bypassing any server side error handling that I've built.

The funny twist on this is that there is nothing really happening to the grid. The users are selecting data from ASP controls that will then be posted back to the database and the grid will be redrawn after the users is done selecting and typing what they need. They don't get that far. Before there can be any finalization, the ASP form throws and unhandled exception and references a GridTemplateColumn as the culprit.(See attached). All server-side code executes without a hitch, but as soon as the grid is being drawn, this error comes up.

Here is the RadGrid ASP.NET code for the GridTemplateColumn:

<telerik:GridTemplateColumn

UniqueName="tempLDTEff1"

DataType="System.DateTime"

HeaderText="LDT1 Effective Date"

Reorderable="False"

Resizable="False"

ShowSortIcon="False"

HeaderStyle-Width="80px"

DataField="LDT1EffPct"

ReadOnly="True"

>

<HeaderTemplate>

<asp:Label

ID="headLDTEff1"

Text ="LDT1 Effective Date"

runat="server">

</asp:Label><br />

<asp:TextBox

ID="txtNewLDTDate1"

runat="server"

ToolTip="Type new date to add an LDT. Can accept 'mm/dd/yyyy' and 'm/d/yyyy' formats"

OnTextChanged="txtNewLDTDate1_OnTextChanged"

AutoPostBack="true"

Font-Bold="true"

onKeyDown="if(event.keyCode==13) event.keyCode=9;"

Width="75px"

>

</asp:TextBox>

<asp:Button

ID ="btnLDT1Delete"

runat="server"

Text ="Delete LDT1"

Visible="false"

OnClick="btnLDT1Delete_Click"

BorderStyle="None"

Font-Underline="true"

ForeColor="Blue"

BackColor="Transparent"/>

<asp:RegularExpressionValidator

ID="regExtNewLDTDate1"

runat="server"

ErrorMessage="Invalid date format. Can accept 'mm/dd/yyyy' and 'm/d/yyyy' formats"

ControlToValidate="txtNewLDTDate1"

Display="Static"

ValidationExpression="^[0,1]?\d{1}\/(([0-2]?\d{1})|([3][0,1]{1}))\/(([1]{1}[9]{1}[9]{1}\d{1})|([2-9]{1}\d{3}))$">

</asp:RegularExpressionValidator>

<asp:Label

ID="lblLDT1"

runat="server">New LDT Effort %

</asp:Label>

</HeaderTemplate>

<ItemTemplate>

<telerik:RadNumericTextBox

runat="server"

ID="txtLDT1Dt"

DbValue='<%# Eval("LDT1EffPct") %>'

OnTextChanged="TextChanged"

AutoPostBack="true"

onKeyDown="if(event.keyCode==13) event.keyCode=9;"

Width="50px">

</telerik:RadNumericTextBox>

</ItemTemplate>

<FooterTemplate>

<asp:Label ID="footLDTEff1" Text ="LDT1 Sum" runat="server" Font-Bold="true"></asp:Label>

</FooterTemplate>

<HeaderStyle Width="80px"></HeaderStyle>

</telerik:GridTemplateColumn>

I am not sure why this is happening and I am out of ideas. Any help would be greatly appreciated.

4 Answers, 1 is accepted

answered on 02 Jan 2014, 08:44 AM

TemplateColumn.zip

Hello Brad,

I prepared a small sample based on the information which you have provided, but I am afraid I was not able to replicate the issue locally. Could you please give the sample a try and let me know how it differs from your real setup? I would appreciate if you could modify the sample and attached it to this thread or let me know how to modify it in order to observe the issue locally.

Regards,
Kostadin
Telerik

If you want to get updates on new releases, tips and tricks and sneak peeks at our product labs directly from the developers working on the RadControls for ASP.NET AJAX, subscribe to the blog feed now.

answered on 20 May 2014, 10:35 PM

Hi Kostadin,

I have not been able to resolve this issue. I can not find anything that is different from you version of the radgrid control than mine. I am not doing a lot of javascript for the controls and am mostly handling the data changes in post-backs.

What I can tell you for sure is that I did not get back to you on this in December 2013 because I had upgraded to a new version of the controls, which seemed to remedy the situation. However, I have recently been migrating this application to a new server and took the opportunity to upgrade the Telerik controls again. In December, I had been working on a trial version (2009.1.0402.35). For various reasons, the upgrade was not done on one of my applications (the one that is currently having the problem), but another was ubgrated to product version 2013.3.1015.35 and did not experience the same issues as I am now experiencing.

Now, when I try to upgradet his partiuclar application, this issue comes up again. I have tried to keep the.NET version 3.5 and also upgraded it to 4.0, but the issue is the same either way.

The upgrade wizard does not seem to handle the upgrade very well. There are still many manual changes that need to be made to reference the right assemblies. Everything seems fine until I try to execute post-backs on non-Telerik controls, so it appears that the RadGrid is having issues loading that one column after the orignial loading of the control.

If you have any suggestions, they would be greatly appreciated.

answered on 20 May 2014, 10:42 PM

Here is the code in the .aspx with the ScriptManager and RadGrid code:

<telerik:RadScriptManager ID="RadScriptManager1" Runat="server">
</telerik:RadScriptManager>

<telerik:RadGrid
ID="RadGrid1"
runat="server"
GridLines="Both"
CellPadding="1"
BorderStyle="Solid"
Skin="Vista"
AllowAutomaticDeletes="True"
AllowAutomaticInserts="True"
AllowAutomaticUpdates="True"
AutoGenerateColumns="False"
onneeddatasource="RadGrid1_NeedDataSource"
onitemdatabound="RadGrid1_ItemDataBound"
>
<MasterTableView
CommandItemDisplay="top"
EditMode="InPlace"
ShowFooter="True"
>
<%--'<%# !RadGrid1.MasterTableView.IsItemInserted %>'--%>
<RowIndicatorColumn>
<HeaderStyle Width="20px"></HeaderStyle>
</RowIndicatorColumn>

<ExpandCollapseColumn>
<HeaderStyle Width="20px"></HeaderStyle>
</ExpandCollapseColumn>
<CommandItemTemplate>
<asp:LinkButton
ID="lnkAdd"
Text="Add new Activity"
CommandName=""
Runat="server"
OnClick="AddNewLDTRecord"
Visible="true"
Font-Size="Medium"
Font-Bold="true">
<img
style="border:0px;vertical-align:middle;"
alt=""
src="http://demos.telerik.com/aspnet-ajax/grid/examples/programming/commanditem/Images/AddRecord.gif" />
Add New Activity</asp:LinkButton>
<%--<asp:LinkButton ID="btnCancel" runat="server" CommandName="CancelAll"
Visible='<%# RadGrid1.EditIndexes.Count > 0 || RadGrid1.MasterTableView.IsItemInserted %>'><img style="border:0px;vertical-align:middle;" alt="" src="http://demos.telerik.com/aspnet-ajax/grid/examples/programming/commanditem/Images/Cancel.gif" />Cancel editing</asp:LinkButton>  --%>

</CommandItemTemplate>
<Columns>

<telerik:GridBoundColumn
DataField="LDTID"
HeaderText="LDTID"
UniqueName="LDTID"
DataType="System.Int32"
SortExpression="LDTID"
ReadOnly="true" Visible="False">
</telerik:GridBoundColumn>
<telerik:GridBoundColumn
DataField="EmpID"
HeaderText="EmpID"
UniqueName="EmpID"
DataType="System.Int32"
SortExpression="EmpID"
ReadOnly="true" Visible="False">
</telerik:GridBoundColumn>
<telerik:GridBoundColumn
DataField="EffDate"
HeaderText="EffDate"
UniqueName="EffDate"
DataType="System.DateTime"
SortExpression="EffDate"
Visible="False"
ReadOnly="false"
>
</telerik:GridBoundColumn>
<telerik:GridCheckBoxColumn
DataField="Submitted"
DataType="System.Boolean"
HeaderText="Submitted"
SortExpression="Submitted"
UniqueName="Submitted"
ReadOnly="true"
Visible="False">
</telerik:GridCheckBoxColumn>
<telerik:GridBoundColumn
HeaderText="EffID"
UniqueName="EffID"
DataField="EffID"
DataType="System.Int32"
SortExpression="EffID"
ReadOnly="true" Visible="False">
</telerik:GridBoundColumn>

<telerik:GridBoundColumn
DataField="PM"
HeaderText="PM"
UniqueName="PM"
SortExpression="PM"
ReadOnly="true">
</telerik:GridBoundColumn>
<telerik:GridBoundColumn
DataField="AcctUnit"
HeaderText="AU"
SortExpression="AcctUnit"
UniqueName="AcctUnit"
ReadOnly="false">
</telerik:GridBoundColumn>

<telerik:GridBoundColumn
DataField="Activity"
HeaderText="Activity"
SortExpression="Activity"
UniqueName="Activity" DataType="System.Int32"
ReadOnly="false">
</telerik:GridBoundColumn>
<telerik:GridBoundColumn
DataField="Description"
HeaderText="Project"
SortExpression="Description"
UniqueName="Description"
ReadOnly="true"
>
<ItemStyle Width="250px" />
</telerik:GridBoundColumn>

<telerik:GridBoundColumn
DataField="EndDate"
DataType="System.DateTime"
DataFormatString="{0:d}"
HeaderText="End Date"
SortExpression="EndDate"
UniqueName="EndDate"
ReadOnly="true">
</telerik:GridBoundColumn>

<telerik:GridTemplateColumn DataField="EffPct" DataType="System.Decimal"
HeaderText="Previous LDT Effort %" SortExpression="EffPct" UniqueName="EffPct"
HeaderStyle-Width="80px" >
<HeaderTemplate>
<asp:Label runat="server" ID="lblCurrentLDTDate" Text="Current LDT Date" Visible="true">
</asp:Label>
</HeaderTemplate>
<ItemTemplate
>
<asp:Label
ID="lblEffPct"
runat="server"
Text='<%# Eval("EffPct") %>'
Font-Bold="true"
ForeColor="Blue"
></asp:Label>
<%--<telerik:RadNumericTextBox
ID="txtEffPct"
runat="server"
NumberFormat-DecimalDigits="2"
DbValue='<%# Eval("EffPct") %>'
Enabled="false"
Width="50px"
>
</telerik:RadNumericTextBox>--%>

</ItemTemplate>
<EditItemTemplate>
<asp:TextBox
ID="EffPctTextBox"
runat="server"
Text='<%# Bind("EffPct") %>'
onKeyDown="if(event.keyCode==13) event.keyCode=9;"></asp:TextBox>
</EditItemTemplate>
<FooterTemplate>
<asp:Label ID="footCurrentLDTSum" Text ="Curr LDT Sum" runat="server" Font-Bold="true"></asp:Label>
</FooterTemplate>
</telerik:GridTemplateColumn>
<telerik:GridTemplateColumn
UniqueName="tempLDTEff1"
DataType="System.DateTime"
HeaderText="LDT1 Effective Date"
Reorderable="False"
Resizable="False"
ShowSortIcon="False"
HeaderStyle-Width="80px"
DataField="LDT1EffPct"
ReadOnly="True"
>
<HeaderTemplate>

<asp:Label
ID="headLDTEff1"
Text ="LDT1 Effective Date"
runat="server">
</asp:Label><br />

<asp:TextBox
ID="txtNewLDTDate1"
runat="server"
ToolTip="Type new date to add an LDT. Can accept 'mm/dd/yyyy' and 'm/d/yyyy' formats"
OnTextChanged="txtNewLDTDate1_OnTextChanged"
AutoPostBack="true"
Font-Bold="true"
onKeyDown="if(event.keyCode==13) event.keyCode=9;"
Width="75px"
>
</asp:TextBox>
<asp:Button
ID ="btnLDT1Delete"
runat="server"
Text ="Delete LDT1"
Visible="false"
OnClick="btnLDT1Delete_Click"
BorderStyle="None"
Font-Underline="true"
ForeColor="Blue"
BackColor="Transparent"/>
<asp:RegularExpressionValidator
ID="regExtNewLDTDate1"
runat="server"
ErrorMessage="Invalid date format. Can accept 'mm/dd/yyyy' and 'm/d/yyyy' formats"
ControlToValidate="txtNewLDTDate1"
Display="Static"
ValidationExpression="^[0,1]?\d{1}\/(([0-2]?\d{1})|([3][0,1]{1}))\/(([1]{1}[9]{1}[9]{1}\d{1})|([2-9]{1}\d{3}))$">
</asp:RegularExpressionValidator>
<asp:Label
ID="lblLDT1"
runat="server">New LDT Effort %
</asp:Label>
</HeaderTemplate>
<ItemTemplate>
<telerik:RadNumericTextBox
runat="server"
ID="txtLDT1Dt"
DbValue='<%# Eval("LDT1EffPct") %>'
OnTextChanged="TextChanged"
AutoPostBack="true"
onKeyDown="if(event.keyCode==13) event.keyCode=9;"
Width="50px">
</telerik:RadNumericTextBox>
</ItemTemplate>
<FooterTemplate>
<asp:Label ID="footLDTEff1" Text ="LDT1 Sum" runat="server" Font-Bold="true"></asp:Label>
</FooterTemplate>
<HeaderStyle Width="80px"></HeaderStyle>
</telerik:GridTemplateColumn>

<telerik:GridBoundColumn
HeaderText="Changed?"
UniqueName="Changed1"
DataField="Changed1"
SortExpression="Changed1"
ReadOnly="True"
>
</telerik:GridBoundColumn>
<%--<telerik:GridCheckBoxColumn
DataField="Hold"
DataType="System.Boolean"
HeaderText="On Hold?"
SortExpression="Hold"
UniqueName="Hold"
ReadOnly="True">
</telerik:GridCheckBoxColumn>--%>
<telerik:GridTemplateColumn
UniqueName="tempHold"
Reorderable="False"
Resizable="False"
ShowSortIcon="False"
Visible="false"
>

<HeaderTemplate>
<asp:Label
ID="lblHold1"
Text ="On Hold?"
runat="server">
</asp:Label>
</HeaderTemplate>
<ItemTemplate>
<asp:CheckBox ID="chkOnHold"
runat="server"
AutoPostBack="False"
Checked='<%# DataBinder.Eval (Container.DataItem,"Hold").ToString()!="True"?false:true %>'
Enabled="false"/>
</ItemTemplate>
</telerik:GridTemplateColumn>
<telerik:GridBoundColumn
DataField="HoldBy"
HeaderText="Held By"
SortExpression="HoldBy"
UniqueName="HoldBy"
ReadOnly="true"
Visible="false">
</telerik:GridBoundColumn>
<telerik:GridTemplateColumn
UniqueName="tempLDTEff2"
Reorderable="False"
Resizable="False"
ShowSortIcon="False" ReadOnly="True"
>

<HeaderTemplate>
<asp:Label
ID="headLDTEff2"
Text ="LDT2 Effective Date"
runat="server">
</asp:Label>
<%-- <asp:LinkButton
ID="lnkEditLDT2Date"
Text="Edit"
CommandName=""
Runat="server"
OnClick="ToggleDateEdit"
Visible="true"
>

</asp:LinkButton>
<asp:Button
ID="btnEditLDT2Date"
runat="server"
Text="Edit"
OnClick="ToggleDateEdit"
BorderStyle="Groove"
BorderColor="Blue"
AutoPostBack="true"/> --%>

<asp:Label
ID="lblLDTDate2"
Text =" "
runat="server">
</asp:Label>
<asp:TextBox
ID="txtNewLDTDate2"
runat="server"
ToolTip="Type new date to add an LDT. Can accept 'mm/dd/yyyy' and 'm/d/yyyy' formats"
OnTextChanged="txtNewLDTDate2_OnTextChanged"
AutoPostBack="true"
Font-Bold="true"
onKeyDown="if(event.keyCode==13) event.keyCode=9;"
Width="75px">
</asp:TextBox>
<asp:Button
ID ="btnLDT2Delete"
runat="server"
Text ="Delete LDT2"
Visible="false"
OnClick="btnLDT2Delete_Click"
BorderStyle="None"
Font-Underline="true"
ForeColor="Blue"
BackColor="Transparent"/>
<asp:RegularExpressionValidator
ID="regExtNewLDTDate2"
runat="server"
ErrorMessage="Invalid date format. Can accept 'mm/dd/yyyy' and 'm/d/yyyy' formats"
ControlToValidate="txtNewLDTDate2"
Display="Static"
ValidationExpression="^[0,1]?\d{1}\/(([0-2]?\d{1})|([3][0,1]{1}))\/(([1]{1}[9]{1}[9]{1}\d{1})|([2-9]{1}\d{3}))$">
</asp:RegularExpressionValidator>
<asp:Label
ID="lblLDT2"
runat="server"
>New LDT Effort %
</asp:Label>
</HeaderTemplate>

<ItemTemplate>
<telerik:RadNumericTextBox
ID="txtLDT2Dt"
runat="server"
AutoPostBack="true"
NumberFormat-DecimalDigits="2"
OnTextChanged="TextChanged"
DbValue='<%# Eval("LDT2EffPct") %>'
onKeyDown="if(event.keyCode==13) event.keyCode=9;"
Width="50px">

</telerik:RadNumericTextBox>

</ItemTemplate>

<FooterTemplate>
<asp:Label ID="footLDTEff2" Text ="LDT2 sum" runat="server" Font-Bold="true"></asp:Label>
</FooterTemplate>

<FooterStyle Font-Bold="True" />
<HeaderStyle Width="80px"></HeaderStyle>
</telerik:GridTemplateColumn>

<telerik:GridBoundColumn
DataField="Changed2"
HeaderText="Changed?"
SortExpression="Changed2"
UniqueName="Changed2"
ReadOnly="true">
</telerik:GridBoundColumn>
<telerik:GridTemplateColumn
UniqueName="tempOnHold2"
HeaderText="On Hold?"
Visible="false">
<ItemTemplate>
<asp:CheckBox ID="chkOnHold2"
runat="server"
AutoPostBack="False"
Checked='<%# DataBinder.Eval (Container.DataItem,"Hold2").ToString()!="True"?false:true %>'
Enabled="false"/>
</ItemTemplate>
</telerik:GridTemplateColumn>
<%--<telerik:GridCheckBoxColumn
DataField="Hold2"
DataType="System.Boolean"
HeaderText="On Hold?"
SortExpression="Hold"
UniqueName="Hold2"
ReadOnly="True">
</telerik:GridCheckBoxColumn>--%>
<telerik:GridBoundColumn
DataField="HoldBy2"
HeaderText="Held By"
SortExpression="HoldBy2"
UniqueName="HoldBy2"
ReadOnly="true"
Visible="false">
</telerik:GridBoundColumn>

</Columns>
<EditFormSettings
ColumnNumber="2"
CaptionDataField="Activity"
CaptionFormatString="Edit properties of Product {0}">
<FormTableItemStyle Wrap="False"></FormTableItemStyle>
<FormCaptionStyle ></FormCaptionStyle>
<FormMainTableStyle GridLines="None" CellSpacing="0" CellPadding="3" BackColor="White"
Width="100%" />
<FormTableStyle CellSpacing="0" CellPadding="2" Height="110px" BackColor="White" />
<FormTableAlternatingItemStyle Wrap="False"></FormTableAlternatingItemStyle>
<EditColumn ButtonType="ImageButton" InsertText="Insert Order" UpdateText="Update record"
UniqueName="EditCommandColumn1" CancelText="Cancel edit">
</EditColumn>
<FormTableButtonRowStyle HorizontalAlign="Right" ></FormTableButtonRowStyle>
</EditFormSettings>
</MasterTableView>
</telerik:RadGrid>