why EF cant translate Int32.Parse in Where Condition section?

for example below code has error :

var query = (from list in dbContext.Packages
                             where list.Id == Int32.Parse(Request["Id"].ToString())
                             select list).FirstOrDefault();


i solved this problem :

Int32 ID = Int32.Parse(Request["Id"].ToString());
 var query = (from list in dbContext.Packages
                             where list.Id == ID
                             select list).FirstOrDefault();



Question: Extending Internal Link and External Link to allow selection of Images
Answer: You can actually extend any dialog by editing the xml files in /shell/Applications/Dialogs

In another thread I have shown how to add a maxlength to the title field, that should help you get on your way: Sitecore 7:Limit number of Characters entered for Link Title Field in General Link