Questions on UI for ASP.NET AJAX Forum

3 answers

1.0K+ views

Getting "Object reference not set to an instance of an object" when clicking on Export To Excel button

Hi,

I am getting the error "Object reference not set to an instance of an object" when I click on Export to Excel button:

Here are the details:

Object reference not set to an instance of an object.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:


            [NullReferenceException: Object reference not set to an instance of an object.]
   Telerik.Web.UI.GridTableView.PrepareExport() +72
   Telerik.Web.UI.Grid.Export.TableViewExporter.PrepareForExportInternal(GridTableView tableView, Boolean ignorePaging, Boolean dataOnly) +373
   Telerik.Web.UI.GridTableView.ClearTableViewControls(Control control, TableViewExporter exporter, GridTableView ownerTable) +597
   Telerik.Web.UI.Grid.Export.TableViewExporter.PrepareForExportInternal(GridTableView tableView, Boolean ignorePaging, Boolean dataOnly) +670
   Telerik.Web.UI.Grid.Export.TableViewExporter.PrepareForExport() +59
   Telerik.Web.UI.Grid.Export.TableViewExporter.page_PreRender(Object sender, EventArgs e) +34
   System.EventHandler.Invoke(Object sender, EventArgs e) +0
   System.Web.UI.Control.OnPreRender(EventArgs e) +8686422
   System.Web.UI.Control.PreRenderRecursiveInternal() +80
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +842

Version Information: Microsoft .NET Framework Version:2.0.50727.3623; ASP.NET Version:2.0.50727.3618

What might be the possible reason for this?

-Rajesh

Grid

answered on 02 Aug 2011

2 answers

212 views

[Solved] How can i set Text in InsertCaption and CaptionFormatString of EditFormSettings in Code Behind

Please help me to set Text in InsertCaption and and CaptionFormatString of EditFormSettings in Code Behind. Thanks

Grid

answered on 02 Aug 2011

2 answers

196 views

[Solved] RadComboBox OnSelectedIndexChanged

I am trying to use the Selected index of one RadComboBox help build the query to populate another RadComboBox, they are both in the <EditItemTemplate>.
I get an Object reference not set to instance of an object when I run this code just adding a RadComboBoxItem without even building the query.

Protected Sub ItemType_SelectedIndexChanged(ByVal o As Object, ByVal e As RadComboBoxSelectedIndexChangedEventArgs)

Dim DDL As RadComboBox = TryCast(RadGrid1.FindControl("FlatFileType").Controls(0), RadComboBox)

Dim RadComboBoxItem1 As New RadComboBoxItem("First Item")

DDL.Items.Add(RadComboBoxItem1)

End Sub

I am not sure how to correctly access the second radcombobox to be able to populate it.
Any help is greatly appreciated.

ComboBox

answered on 02 Aug 2011

0 answers

108 views

radrating bad display

rad ratin display bad

Rating

asked on 02 Aug 2011

2 answers

258 views

DataFormatString & export to Excel

Hi all,

I am using the GridBoundColumn to display my DateTime data.
And I use the DataFormatString="{0:MM/dd/yyyy}" to make time invisible.
However, when export to Excel, it appears (see Image)
I just want to display day only.

<telerik:GridBoundColumn HeaderText="ETA Date" UniqueName="ETA_Date" DataField="ETA_Date" DataFormatString="{0:MM/dd/yyyy}" ReadOnly="true" SortExpression="ETA_Date" >

<HeaderStyle Font-Bold="True" Wrap="False" HorizontalAlign="Center"></HeaderStyle>

<ItemStyle Wrap="False" HorizontalAlign="Center"></ItemStyle>

</telerik:GridBoundColumn>

Thanks.

Andy,

Grid

answered on 01 Aug 2011

1 answer

74 views

Add New button (Insert mode) does not work

If i comment out the selectvalue portion it works and i am able to ADD NEW Item.

If TypeOf e.Item Is GridEditableItem AndAlso e.Item.IsInEditMode Then

Dim editedItem As GridEditableItem = CType(e.Item, GridEditableItem)

Dim Manufacturers As RadComboBox = CType(editedItem.FindControl("ManufacturerEdit"), RadComboBox)

ProductsAccess.BindManufacturers(Manufacturers)

'Dim Manufacturer As Integer = DataBinder.Eval(editedItem.DataItem, "Manufacturer").ToString

'Manufacturers.SelectedValue = Manufacturer

Dim Categories As RadComboBox = CType(editedItem.FindControl("CategoryEdit"), RadComboBox)

ProductsAccess.BindCategories(Categories)

'Dim Category As Integer = DataBinder.Eval(editedItem.DataItem, "Category").ToString

'Categories.SelectedValue = Category

If i un-comment those lines i am only able to EDIT the items but when i click add new button it does nothing.

If TypeOf e.Item Is GridEditableItem AndAlso e.Item.IsInEditMode Then

Dim editedItem As GridEditableItem = CType(e.Item, GridEditableItem)

Dim Manufacturers As RadComboBox = CType(editedItem.FindControl("ManufacturerEdit"), RadComboBox)

ProductsAccess.BindManufacturers(Manufacturers)

Dim Manufacturer As Integer = DataBinder.Eval(editedItem.DataItem, "Manufacturer").ToString

Manufacturers.SelectedValue = Manufacturer

Dim Categories As RadComboBox = CType(editedItem.FindControl("CategoryEdit"), RadComboBox)

ProductsAccess.BindCategories(Categories)

Dim Category As Integer = DataBinder.Eval(editedItem.DataItem, "Category").ToString

Categories.SelectedValue = Category

ProductsAccess.BindManufacturers(Manufacturers) is a pretty simple Sub that bind combobox to datatable. I even tried with iterating DataRows in the DataTable.Rows collection and populating the combo one by one. The problem persisted :(
THanks

Grid

answered on 01 Aug 2011

1 answer

83 views

grid styling problem

I have a grid inside a JQuery accordian control. The grid is using the windows7 skin.
Alternate rows in the grid have white borders around vertcal edgaes of cells and bottom edges of cells.
Im assuming something is 'interfering' with the css of the grid. How can I force the grid to not show these borders ?

Ive attached a screenshot to show whats happening

Grid

answered on 01 Aug 2011

2 answers

228 views

[Solved] Access RadTextBox in Table

Group,
Not sure there is an easy way to explain this, but basically I have an HTML table containing 4 columns with a bunch of RadTextBox controls. What I am trying to do is iterate through each row of the HTML table and grab the the value of the RadTextBox based off of the cell index.

Below is a snippet of the code which appears to work for a regular asp textbox but not a radtextbox. I get the error:
Unable to cast object of type 'System.Web.UI.LiteralControl' to type 'Telerik.Web.UI.RadTextBox'.

foreach (HtmlTableRow row in uc.RecommendationTable.Rows)
{
var rec1 = (RadTextBox)row.Cells[1].Controls[0];
}

i basically want to avoid having to use any find controls or anything because there are like 20 rows of 4 columns. I want to iterate through each row and give me the value of the control located in each column of the HTML table.

Input

answered on 01 Aug 2011

1 answer

71 views

How to persist focus on pager index while dataediting in grid

we update the data on the client and then process all changes on the server with a Grid /Client Edit with single batch update .
we are using this link http://demos.telerik.com/aspnet-ajax/grid/examples/dataediting/clienteditbatchupdates/defaultcs.aspx
we have one problem,how to persist focus on grid pager when we update record on one page ie pager index 1 and move to second page ie pager index 2,when we again go back to previous record ie on page 1 in grid it will go to page 1 but pager index is not updated it still focus on pager index 2. How to persist focus to pager index to previous page .

Grid

answered on 01 Aug 2011

3 answers

202 views

ReadOnly column in Edit Form?

In the following extracted code, column 'Id' is not visible at all times. Column 'AE' should be invisible, too. However, column 'AE' appears in the EditForm despite event ItemDataBound event which sets both columns Visible = False.

How can I hide column AE?

<telerik:RadGrid ID="rgHeader" runat="server" CellSpacing="0" DataSourceID="sdsHeader">