Predicate builder Convert.ToInt32 giving error?

Question

In asp.net mvc4 project I am using predicate builder. Here is my code:

public static Expression<Func<AdModel, bool>> AddConditionToQuery( )
{
    Guid g = new Guid("d521291f-2edb-4efc-96ac-25a4993bf028");
    predicate = predicate.Or(p => (p.OptionID == g) && ( Convert.ToInt32(p.AdDetail) > 10000) );
    return predicate;
}


var result = (
           from p in mev.AdModels.AsExpandable().Where(filter)
           select new
           {
               mev.AdCategoryTrees.FirstOrDefault(s => s.AdID == p.AdID).CategoryID,
               mev.AdCategoryTrees.FirstOrDefault(s => s.AdID == p.AdID).CategoryName,
           }).Distinct();

For Convert.ToInt32 I am taking error below. Is there any other wat to do thıs.

Additional information: LINQ to Entities does not recognize the method 'Int32 ToInt32(System.String)' method, and this method cannot be translated into a store expression.

Thank you.