Using foreach to run thru an arraylist containing a struct

[Kyle Wood]

I have the following code extract: public arraylist myList = new arraylist(); public struct myDBList { public string strKey; public string strName; public string strDataSetName; } I loop thru a list of databases and add data from each to my list: foreach (database db in dbList) { myDBList.strKey = db.Key.ToString(); myDBList.strActual = db.Name.ToFriendlyString(); myDBList.strDataSetName = db.Path.ToFriendlyString(); myList.Add(myDBList); } this arraylist is then passed to a 2nd form with: Form myLogon = new Form(); myLogon.passedList = myList; In the 2nd form I have declared the same arraylist & struct and I want to loop thru the list and extract the data so I use: ArrayList newList = new ArrayList(); public struct myDBList { public string strKey; public string strName; public string strDataSetName; } string key; public arraylist passedList { get{ newList = value; } } and in the code: foreach( dbList db in newList) { key = db.strKey; . . } While the code compiles, when I come to execute the foreach statement i get the error: InvalidCastException was unhandled - specified cast is not valid What am I doing wrong here ??

[J4amieC]

Just because the 2 declared structs have the same fields, it doesnt mean you can cast from one to the other. Declare the struct once, in a project that both locations can access.

[Kyle Wood]

Thanks J4amieC. If I'd noticed what the tags were telling me when I hovered over the foreach I'd have seen this for myself. I removed the declaration of the DBList in form 2 and qualified the DBList in the foreach with the form 1 instance and it all works !! A case of not spotting the obvious. :)