Get Value from Multi-Select Control Or Get split value from a string in d365

public container SSI_createContainers()
{
List            list = new List(Types::String);
ListIterator    i;
    container       RecIds, Names;
RecId           id;

//Create Container for the RecIds, Names
list = Global::strSplit(SalesParameters.SSI_MainAccountId,”;”);

i = new ListIterator(list);
while(i.more())
{
id = MainAccount::findByMainAccountId(i.value()).RecId;
RecIds += id;
Names += i.value();
i.next();
}

return [RecIds, Names];

}

reference - https://stoneridgesoftware.com/how-to-create-multi-select-lookup-in-microsoft-dynamics-ax/

Link for multi select lookup on SSRS report - 

https://dynamicsaxinsight.wordpress.com/2014/12/12/ax-2012-multi-select-lookup-for-ssrs-report-dialog/