We used Telerik in our application. The network team reported a spam in it.

Using Telerik grid with SortExpression in telerik:GridTemplateColumn, has been reported as high priority network issue.

Issue name : Ajax request header manipulation (DOM-based)

Recorded the issue in below snippet of responce.

onclick="Telerik.Web.UI.Grid.Sort()"
 
Please let me know if you have any suggestions.!!!

Reproduction of the issue

RadGrid declaration

<telerik:RadButton runat="server" Text="PostBack"  AutoPostBack="true"></telerik:RadButton>
<telerik:RadGrid runat="server" ID="RadGrid2">
    <MasterTableView DataKeyNames="Column1" ClientDataKeyNames="Column1" CommandItemDisplay="Top">
            <Columns>
            <telerik:GridBoundColumn UniqueName="Col1" DataField="Column1" HeaderText="Col1"s></telerik:GridBoundColumn>
                <telerik:GridBoundColumn UniqueName="Col2" DataField="Column2" HeaderText="Col2"></telerik:GridBoundColumn>
                <telerik:GridBoundColumn UniqueName="Co13" DataField="Column3" HeaderText="Co13"></telerik:GridBoundColumn>
                <telerik:GridBoundColumn UniqueName="Col4" DataField="Column4" HeaderText="Col4"></telerik:GridBoundColumn>
        </Columns>
    </MasterTableView>
    <ClientSettings ReorderColumnsOnClient="false" AllowColumnsReorder="true">
            <DataBinding Location="~/Api/RevCodeGrid" SelectMethod="GetDataAndCount2"   >
        </DataBinding>
    </ClientSettings>
</telerik:RadGrid>

RevCodeGridController

public class Test
{
    public String Column1 { get; set; }
    public String Column2 { get; set; }
    public String Column3 { get; set; }
    public String Column4 { get; set; }
}


[HttpPost]
public virtual RadGridResultData GetDataAndCount2(object context)
{
    List<Test> items = new List<Test>();
    items.Add(new Test() { Column1 = "1", Column2 = "A", Column3 = "A1", Column4 = "A12" });
    items.Add(new Test() { Column1 = "2", Column2 = "B", Column3 = "B1", Column4 = "B12" });
    items.Add(new Test() { Column1 = "3", Column2 = "C", Column3 = "C1", Column4 = "C12" });
    items.Add(new Test() { Column1 = "4", Column2 = "D", Column3 = "D1", Column4 = "D12" });

    return new RadGridResultData { Data = items, Count = items.Count };
}

In Telerik version 2016.2.607.45, the RadGrid Excel Like Filtering Context Menu Style is Broken. The width and alignment is not 100%. When I drop the older Telerik.Web.UI dll and corresponding Skins dll in my project, the issue is gone. I have attached two images, one from the latest release, and one from the older version. You can see how the latest versions style breaks and does not show the menu correctly. 

With the use of the "UseStaticHeaders"-Parameter all ARIA-Tags are gone in the rendered RadGrid.
We need the support of WAI-ARIA in our application for our customer.
Dont using this Parameter is no option for us.
You are not telling this missing function in your documentation.

Referring to: http://www.telerik.com/forums/dynamically-populate-databind-batchedit-radcombobox. 

Love the batch-edit, but just missing one major showstopper for me - being able to dynamically populate information in the edit controls for each row. A simplified example (using NFL and DivisionIDs) is explained in the above link.

Thanks for the consideration!

- Pat

Allow the possibility of saving the batch edit changes either from the server or together with another postback. Currently saving can be done through a button with client-side code but only if the button has no postback. When something on the form will cause a postback (e.g. tab change, combo box selection) it would be nice to be able to automatically save batch edit changes in the client-side code for that control.  Right now that code will have no effect because of the postback. When other changes have to be made at the same time as the batch edit changes, with code that is in the batcheditcommand event on the server, the event will not fire unless there were changes to the grid, so those other changes could be lost.

Applies to all model-bound controls; Tree-list, etc..

Current data-annotation support includes validation.

Please include handling of the following attributes
- Display Name defaults for databound columns
- Text boxes and labels width based on max-length
- Display attributes
- auto-generation of drop-downs for enum datatypes and foreign keys
- readonly based on editable attribute

Current RadGrid (Q3 2015) does supports model binding of master/detail records.

Request the functionality to set ItemType on the detail gridview and pass the master's datakey as the id for the detail select method.

Or, alternatively, if the model has a virtual IQuerable binding, set the detail view's datasource to the models virtual entity

For example, a model with a one to many relationship to the color options for a car:
Model Cars()
{ string name
int colorRange
virtual colorOptionsModel colorOptions
}
Model colorOptionsModel
{
int colorRange
 string colorName;
} 

In the RadGrid:
<mastertable DataKeyName = "colorRange">
<DetailView datasource="Item.colorOptions">

In radgrid, the excel style filtering shows a checkbox list of values to filter a column.  This has limited use on a date + time column of a grid, because such a list would show basically every grid row value in the list.  I can bind date only to the filter checkboxes to shorten that list, but if I apply a selected checkbox to filter then there will be no records returned.  This checkbox filtering needs to work with the grid column attribute EnableTimeIndependentFiltering (when it is filtering a datetime column) but it does not - that attribute only works with the datepicker calendar and text entry.   

Set up to reproduce:

<telerik:RadGrid ID="RadGrid1" runat="server" ....>
    <MasterTableView EditMode="Batch" ....>
        <BatchEditingSettings HighlightDeletedRows="true" />
        <Columns>
            <telerik:GridBoundColumn DataField="OrderID" Display="false" UniqueName="OrderID">
            </telerik:GridBoundColumn>
            <telerik:GridDateTimeColumn DataField="OrderDate" DataType="System.DateTime"
                FilterControlAltText="Filter OrderDate column" HeaderText="OrderDate"
                SortExpression="OrderDate" UniqueName="OrderDate">
            </telerik:GridDateTimeColumn>
....

Because linq to entities no support DateTime.Parse() , So can you DateTime.Parse() to DateTime method

http://www.telerik.com/forums/how-override-filter-pattern-from-radgrid

When using RadGrid GridDropDownColumn that displays referenced data from a different table allow filter to be replaced with a dropdown of available values. For example if my database has a table called Groups with and Id field and Name field; and it also contains a Members table with a GroupId field which contains the Id from the Groups table when I configure the Members GroupId Field with GridDropDownColumn with ListTextField="Name" ListValueField="Id" DataField="GroupId" as the values for the dropdown I should be able to choose FilterType="DropDownControl" to get the functionality found here http://demos.telerik.com/aspnet-ajax/grid/examples/functionality/filtering/filter-templates/defaultcs.aspx for City and Country columns.

When using keyboard navigation, the ESC key currently does some things properly (like closing out of batch editing forms). However, it does not prevent the firing of certain update events (like BatchEditCellValueChanged). The ESC key should act like a "cancel" key, so no update events should fire when it is pressed.

Hello,
Please add support to bind to System.Dynamic.DynamicObject: 
https://msdn.microsoft.com/en-us/library/system.dynamic.dynamicobject%28v=vs.110%29.aspx?f=255&MSPPError=-2147217396
Regards,
Douw

When in batch edit mode, using standard asp.net validation controls will display the validation error within the cell, and expand the cell contents horizontally and possibly vertically as well.  This is a very ugly (and clunky) way to show validation messages in a batch edit mode.  

It would be nice if instead, we could set an grid attribute that specifies a row backcolor when validation fails for a row.  In addition, show that rows validation messages automatically in a tooltip or radtooltip as the user hovers the mouse over the row when it signifies the exception backcolor.  These messages could be assigned to a columns markup as an attribute.   

Another nice to have is to show a  section on the grid (perhaps under the header) that could display to alert the user when validation had failed.

We recently added row group functionality to our grids and we and our users are very happy with this.

Only thing that bothers us is the drop functionality on the grouppanel. We have a wish to make the drop functionality of the grouppanel much more intuitive. Especially when the RadGrid is already grouped on multiple columns.

The marker to indicate where the user will drop an existing grouping column is shown at the begin and the end of the group column connector between groups:

The drop indicator on the group column connector should not be shown at the side of the connector where the dragged column is at to inform the user nothing will happen/change when you drop it here.

 All of these cases can be reproduced on the RadGrid Grouping demo on your site:
 http://demos.telerik.com/aspnet-ajax/grid/examples/functionality/grouping/grouping/defaultcs.aspx

Forum reference:
http://www.telerik.com/forums/grouppanel-column-drop-and-reorder?actionMode=replyPost&postId=d7274118-f8a1-48e1-9ae3-f537fe8d78de

Please could you add an option to the NextPrevNumericAndAdvanced pager mode to allow the Page Size RadTextBox to be displayed as a RadComboBox like the NextPrevAndNumeric pager.
This would help us to have a more consistant look and feel between the 2 pager modes.

I would like to suggest that the Buttons in the RadGrid allow databinding to the CommandName and CommandArgument fields.  And pretty much all the buttons or anything that triggers an ItemCommand event that allow a CommandName and CommandArgument have their properties to be databound and accessible in the code behind.

Thanks!!!