This Code snippet will help you to disable the link button link within rad grid based on some condition
AspX Page
<telerik:RadGrid ID="radgrdValuesetParameter" runat="server" AutoGenerateColumns="false"
GridLines="None" BorderWidth="0" AllowSorting="true" AllowMultiRowSelection="false"
PageSize="20" AllowPaging="true" PagerStyle-Mode="NextPrev" PagerStyle-AlwaysVisible="true"
OnPageIndexChanged="radgrdValuesetParameter_PageIndexChanged"
OnItemCommand="radgrdValuesetParameter_OnItemCommand"
onitemcreated="radgrdValuesetParameter_ItemCreated">
<MasterTableView DataKeyNames="ID">
<Columns>
<telerik:GridTemplateColumn UniqueName="TemplateColumn" HeaderText="#">
<ItemTemplate>
<asp:Label ID="numberLabel" runat="server" />
<%# Container.DataSetIndex+1 %>
</ItemTemplate>
</telerik:GridTemplateColumn>

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