if you defined the columns in the grid manually, you need to set a default value similar to this, although you defined the default value in the annotation or not
@(Html.Kendo()
.Grid()
.DataSource( d=> d.Ajax()
.Model(m=>{
m.Field(f=>f.YourField).DefaultValue(YourValue);
}))
)
@(Html.Kendo()
.Grid()
.Events( e => e.Edit("onEdit"))
)
<script type="text/javascript">
function onEdit(e) {
if (e.model.isNew()) {
e.model.set("PropertyName", Value);
}
}
</script>
,