The error you are receiving is exactly what you should be getting as the conversion really isn’t implemented on the server side now. However, we are currently changing our type converter system and will be able to facilitate server-side conversion in the future. For now, the in-memory conversion is a workaround to get the correct result set.
var gsDirs = (from c
where c.ItemID == itemid &&
gsDirs = gsDirs.Select(x => Convert.ToInt32(x));
Do not hesitate to contact us if you have further questions.
the Telerik team
Do you want to have your say when we set our development plans?
Do you want to know when a feature you care about is added or when a bug fixed?
Telerik Public Issue Tracking
system and vote to affect the priority of the items