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RadGrid is Clearing Rws after Item_Cmmand Event Post

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Grid
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Jaish
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Jaish asked on 10 Aug 2015, 03:04 PM

Below is my Rad grid which is binding from sever side during Page_Load. But once I clicked the "Edit" command, all rows are seeing as cleared after that post back. My edit command is not inline, but it's showing the results on a separate page section. If I replace this grid with normal asp.net GridView, the rows are retaining for the same operation. This RadGrid is inside a usercontrols(ascx) and this usercontrol is inside a RadAjaxPanel of the container page. It appears like ViewState is not ​retaining for me once using RadGrid. Any suggestions?

<P><telerik:RadGrid runat="server" ID="grdItemEnquiry" Width="95%"
CssClass="gridview1" ShowFooter="false" AllowSorting="true" AllowPaging="true"
PageSize="20" EnableViewState="true" Visible="true"
OnItemDeleted="grdItemEnquiry_OnRowDeleting"
OnItemCommand="grdItemEnquiry_RowCommand"AutoGenerateColumns="false"ShowHeaderWhenEmpty="true"RowStyle-CssClass="alterwhite"OnItemDataBound="grdItemEnquiry_OnRowDataBound"AlternatingRowStyle-CssClass="altergrey"
HeaderStyle-CssClass="tableHeading br"
OnPageIndexChanged="grdItemEnquiry_PageIndexChanging"><BR>                                                      
<ClientSettingsAllowColumnsReorder="true"><BR>                                                             
<ClientEventsOnCommand="rgPublicationResults_Command"/><BR>                                                      
</ClientSettings><BR>                                                      
<MasterTableView><BR>                                                             
<Columns><BR>                                                                    
<telerik:GridTemplateColumnHeaderText="S.No"ItemStyle-Width="3%"><BR>                                                                          
<ItemTemplate><BR>                                                                                 
<asp:Label ID="lblSRNO"runat="server"Text='<%#Container.ItemIndex +1
%>'></asp:Label><BR>                                                                          
</ItemTemplate><BR>                                                                    
</telerik:GridTemplateColumn><BR>                                                                    
<telerik:GridTemplateColumnHeaderText="SerialNo"Visible="false"><BR>                                                                          
<ItemTemplate><BR>                                                                                 
<asp:Label ID="lblSerialNo"runat="server"Text='<%#Eval("SerialNo")
%>'></asp:Label><BR>                                                                                 
<asp:Label ID="lblItemID"runat="server"Text='<%#Eval("ItemID")
%>'></asp:Label><BR>                                                                          
</ItemTemplate><BR>                                                                    
</telerik:GridTemplateColumn><BR>                                                                    
<telerik:GridTemplateColumnHeaderText="Item Description"
ItemStyle-Width="10%"
ItemStyle-CssClass="breakWord120"><BR>                                                                          
<ItemTemplate><BR>                                                                                 
<asp:Label ID="lblItemDescr"runat="server"Text='<%#Eval("ItemDesc")
%>'></asp:Label><BR>                                                                          
</ItemTemplate><BR>                                                                    
</telerik:GridTemplateColumn><BR>                                                                    
<telerik:GridTemplateColumnHeaderText="Item Code" ItemStyle-Width="5%"
ItemStyle-CssClass="breakWord120"><BR>                                                                          
<ItemTemplate><BR>                                                                                 
<asp:Label ID="lblItemCode"runat="server"Text='<%#Eval("ItemCode")
%>'></asp:Label><BR>                                                                          
</ItemTemplate><BR>                                                                    
</telerik:GridTemplateColumn><BR>                                                                    
<telerik:GridTemplateColumnHeaderText="Delivery Location"
ItemStyle-Width="7%"
ItemStyle-CssClass="breakWord120"><BR>                                                                          
<ItemTemplate><BR>                                                                                 
<asp:Label ID="lblDelLoc"runat="server"Text='<%#Eval("DelLoc")
%>'></asp:Label><BR>                                                                          
</ItemTemplate><BR>                                                                    
</telerik:GridTemplateColumn><BR>                                                                    
<telerik:GridTemplateColumnHeaderText="Major Category" ItemStyle-Width="5%"
ItemStyle-Wrap="true" ItemStyle-CssClass="DisplayNone"
HeaderStyle-CssClass="DisplayNone"><BR>                                                                          
<ItemTemplate><BR>                                                                                 
<asp:DropDownList
runat="server"ID="ddlcategory"Width="70px"BackColor="Cornsilk"AutoPostBack="true"OnSelectedIndexChanged="ddlcategory_SelectedIndexChanged"/><BR>                                                                          
</ItemTemplate><BR>                                                                    
</telerik:GridTemplateColumn><BR>                                                                    
<telerik:GridTemplateColumnHeaderText="Minor Category" ItemStyle-Width="5%"
ItemStyle-Wrap="true" ItemStyle-CssClass="DisplayNone"
HeaderStyle-CssClass="DisplayNone"><BR>                                                                          
<ItemTemplate><BR>                                                                                 
<asp:DropDownList
runat="server"ID="ddlsubcategory"Width="70px"BackColor="Cornsilk"OnSelectedIndexChanged="ddlsubcategory_SelectedIndexChanged"AutoPostBack="true"/><BR>                                                                          
</ItemTemplate><BR>                          
                                          
</telerik:GridTemplateColumn><BR>                                                                    
<telerik:GridTemplateColumnHeaderText="UOM"ItemStyle-Width="4%"ItemStyle-Wrap="true"><BR>                                                                          
<ItemTemplate><BR>                                                                                 
<asp:Label ID="lblUOM" runat="server"Text='<%#Eval("UOM")
%>'></asp:Label><BR>                                                                          
</ItemTemplate><BR>                                                                    
</telerik:GridTemplateColumn><BR>                                                                    
<telerik:GridTemplateColumnHeaderText="Need By Date" ItemStyle-Width="5%"
ItemStyle-Wrap="true"><BR>                                                                          
<ItemTemplate><BR>                                                                                 
<asp:Label ID="lblNeedDate"runat="server"Text='<%#Eval("NeedDate")
%>'></asp:Label><BR>                                                                          
</ItemTemplate><BR>                                                                    
</telerik:GridTemplateColumn><BR>                                                                    
<telerik:GridTemplateColumnHeaderText="Quantity/Duration"ItemStyle-Width="3%"ItemStyle-Wrap="true"ItemStyle-HorizontalAlign="Center"><BR>                                                                          
<ItemTemplate><BR>                                                                                 
<asp:Label
ID="lblQuantity"runat="server"Text='<%#Eval("Quantity_Duration")
%>'></asp:Label><BR>                                                                          
</ItemTemplate><BR>                                                                          
<FooterTemplate><BR>                                                                                 
<asp:Label ID="lblGTotal"runat="server"Style="font-weight: bold"Text="Grand
Total
 :"></asp:Label><BR>                                                                          
</FooterTemplate><BR>                                                                    
</telerik:GridTemplateColumn><BR>                                                                    
<telerik:GridTemplateColumnHeaderText="Unit Price" ItemStyle-Width="3%"
ItemStyle-HorizontalAlign="Right"><BR>                                                             
               
<ItemTemplate><BR>                                                                                 
<asp:Label ID="lblprice"runat="server"Text='<%# String.Format("{0} {1}",
 Eval("Currency"), Eval("UnitPrice", "{0:0.000}"))
%>'></asp:Label><BR>                                                                                 
<asp:HiddenField
ID="hdnUnitPrice"runat="server"Value='<%#Eval("UnitPrice") %>'
/><BR>                                                                          
</ItemTemplate><BR>                                                                    
</telerik:GridTemplateColumn><BR>                                                                    
<telerik:GridTemplateColumnHeaderText="Taxes"ItemStyle-Width="3%"ItemStyle-HorizontalAlign="Right"
Visible="false"><BR>                                                                          
<ItemTemplate><BR>                                                                                 
<asp:Label
ID="lblTaxes"runat="server"></asp:Label><BR>                                                                          
</ItemTemplate><BR>                                                                    
</telerik:GridTemplateColumn><BR>                                                                    
<telerik:GridTemplateColumnHeaderText="Conversion Rate" ItemStyle-Width="3%"
ItemStyle-HorizontalAlign="Center"><BR>                                                                          
<ItemTemplate><BR>                                                                                 
<asp:Label
ID="lblConvRate"runat="server"></asp:Label><BR>                                                                                 
<asp:Label ID="lbCurrencyValue"Style="display: none"
runat="server"Text='<%#Eval("Currency")
%>'></asp:Label><BR>                                                                          
</ItemTemplate><BR>                                                                    
</telerik:GridTemplateColumn><BR>                                                                    
<telerik:GridTemplateColumnHeaderText="Total Price(QAR)" ItemStyle-Width="3%"
ItemStyle-Wrap="true"
ItemStyle-HorizontalAlign="Right"><BR>                                                                          
<ItemTemplate><BR>                                                                                 
<asp:Label ID="lblTotalPrice"Style="text-align: right; width: 70px"
runat="server"ReadOnly="true"Text='<%#Eval("TotalPrice", "{0:#,#.000}")
%>'></asp:Label><BR>                                                                          
</ItemTemplate><BR>                                                                          
<FooterTemplate><BR>                                                                          
       <telerik:RadNumericTextBox ID="lblTotal"
Style="text-align: right" runat="server" CssClass="textEntry" ReadOnly="true"
MaxLength="10"><BR>                                                                                        
<NumberFormatDecimalDigits="3"/><BR>                                                                          
        
</telerik:RadNumericTextBox><BR>                                                                          
</FooterTemplate><BR>                                                                    
</telerik:GridTemplateColumn><BR>                                                                    
<telerik:GridTemplateColumnHeaderText="File Name" ItemStyle-Width="7%"
ItemStyle-Wrap="true"
ItemStyle-CssClass="breakWord120"><BR>                                                                          
<ItemTemplate><BR>                                                                                 
<asp:LinkButton
ID="btnlineattach"OnClientClick="setFileDownLoadToken();"runat="server"ToolTip="View
 File" CommandName="ViewAttach" OnClick="btnviewattach_Click"
Text='<%#Eval("DocTitle") %>' Style="color: #630040 !important;"
Font-Underline="true" ForeColor="Blue"
CommandArgument='<%#Eval("DocumentFilePath")%>'><BR>                                                                                        
<asp:Label runat="server"ID="lblattachpath"Text='<%#Eval("DocTitle")
%>'></asp:Label><BR>                                                                                 
</asp:LinkButton><BR>                                                                          
</ItemTemplate><BR>                                                                          
<ItemStyleWidth="10%"/><BR>                                                                    
</telerik:GridTemplateColumn><BR>                                                                    
<telerik:GridBoundColumn
DataField="VirtualPath"Visible="false"HeaderText="Description"/><BR>                                                                    
<telerik:GridBoundColumn
DataField="Type"Visible="false"HeaderText="Action"/><BR>                                                                    
<telerik:GridTemplateColumnHeaderText="Is Urgent Requisition"
ItemStyle-Width="8%" ItemStyle-Wrap="true" ItemStyle-HorizontalAlign="Center"
Visible="false" ItemStyle-CssClass="hiddencol"
HeaderStyle-CssClass="hiddencol"><BR>                                                                          
<ItemTemplate><BR>                                                                                 
<asp:Label ID="lblIsReqUrgent"runat="server"Text='<%#Eval("IsReqUrgent")
%>'></asp:Label><BR>                                                                    
        
</ItemTemplate><BR>                                                                    
</telerik:GridTemplateColumn><BR>                                                                    
<telerik:GridTemplateColumnHeaderText="Future Requirement"
ItemStyle-Width="8%" ItemStyle-Wrap="true" ItemStyle-HorizontalAlign="Center"
Visible="true"><BR>                                                                          
<ItemTemplate><BR>                                                                                 
<asp:Label
ID="lblFutureRequirement"runat="server"Text='<%#Eval("FutureRequirement")
%>'></asp:Label><BR>                                                                          
</ItemTemplate><BR>                                                                    
</telerik:GridTemplateColumn><BR>                                                                    
<telerik:GridTemplateColumnItemStyle-Width="3%"HeaderText="Edit"><BR>                                                                          
<ItemTemplate><BR>                                                                                 
<asp:ImageButton
ID="btnedit"runat="server"ImageUrl="~/Images/edit1.png"ToolTip="Edit"CommandName="Edit"CommandArgument='<%#Eval("SerialNo")
%>'
TabIndex="19"/><BR>                                                                          
</ItemTemplate><BR>                                                                          
<ItemStyleWidth="3%"HorizontalAlign="Center"></ItemStyle><BR>                                                                    
</telerik:GridTemplateColumn><BR>                                                                    
<telerik:GridTemplateColumnHeaderText="Delete"ItemStyle-Width="5%"><BR>                                                                          
<ItemTemplate><BR>                                                                                 
<asp:ImageButton
ID="btnDelete"runat="server"ImageUrl="~/Images/delete.png"ToolTip="Delete"CommandName="Delete"CommandArgument='<%#Eval("ItemID")
%>' OnClientClick="return confirm('Do you really want to delete?');"
/><BR>                                                                          
</ItemTemplate><BR>                                                                          
<ItemStyleHorizontalAlign="Center"Width="5%"></ItemStyle><BR>                                                                    
</telerik:GridTemplateColumn><BR>                                                             
</Columns><BR>                                                      
</MasterTableView><BR>                                               
</telerik:RadGrid></P>

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Eyup
Telerik team
answered on 13 Aug 2015, 06:08 AM
Hello Jaish,

The NeedDataSource event is the mandatory way when you need to bind the grid to a programmatic data source in the code-behind. It is important to note that you are not using DataBind() to bind the grid. Performing complex grid operations such as Inserting, Deleting, Updating, Hierarchy relations, Grouping, Exporting, Paging, Sorting, Filtering, etc. require accommodating appropriate database operations.  Therefore, we suggest you to avoid Simple Databinding and strongly recommend the use of more advanced databinding methods, which automatically handle the aforementioned functions:
Declarative DataSource
Programmatic Data Binding


Please make the suggested modification and let me know about the result.


Regards,
Eyup
Telerik
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Jaish
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Eyup
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