RadGrid is Clearing Rws after Item_Cmmand Event Post

[Jaish]

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>

[Eyup]

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