asp.net - Why we need to add asp:ScriptManager when we use teleric radgrid -

asp.net - Why we need to add asp:ScriptManager when we use teleric radgrid -

i want reason adding

asp:scriptmanager id="scriptmanager1" runat="server" enablepartialrendering="true

tag when utilize telerik radgrid.

otherwise throw error this

"the command id 'gdsample' requires scriptmanager on page. scriptmanager must appear before controls need it".

scriptmanager required ajax functionality in asp.net , radgrid telerik ajax based grid.

scriptmanager - msdn

the scriptmanager command central ajax functionality in asp.net. command manages asp.net ajax resources on page. includes downloading microsoft ajax library scripts browser , coordinating partial-page updates enabled using updatepanel controls.

radgrid - telerik.

use radgrid asp.net ajax in simple or advanced scenarios have paging, sorting, filtering , info editing grouping , displaying hierarchical data. accomplish desktop-like performance data-dense applications abundance of client-side features , minimal html , scripts loaded.

asp.net telerik telerik-grid