I modified your code @jayesh-goyani. Telerik Grid needs a '<' to open logic in
.ClientTemplate
`colums.Bound(d => d.SeVePandora).Width(50).Sortable(false).ClientTemplate(
"<# if (SeVePandora == true) { #>" +
"<span>Yes</span>" +
"<# } else { #>" +
"<span>No</span>" +
"<# } #>"
);`
Thank you for your help!