Create a cycle in T-SQL from the list - tsql

Question

I have code written in C#, but I want to create a T-SQL script to run on the server. This is part of my C# code that I want to convert to T-SQL:
var enumerator = distinctlist.GetEnumerator();
while (enumerator.MoveNext())
{
mtbn dtb = enumerator.Current as mtbn;
var user = users.Where(x => x.Name == dtb.UserNameTb).FirstOrDefault();
var action = actions.Where(x => x.Name == dtb.ActionTb.Value.ToString()).FirstOrDefault();
var project = projects.Where(x => x.Name == dtb.ProjectNameTb).FirstOrDefault();
var transaction = transactions.Where(x => x.Name == dtb.TransactioNameTb).FirstOrDefault();
TransactBoard transactBoard = dbContext.TransactBoard.Add(new TransactBoard
{
User = user != null ? user : new EF.User { Name = dtb.UserNameTb },
Action = action != null ? action : new EF.Action { Name = dtb.ActionTb.Value.ToString() },
Project = project != null ? project : new Project { Name = dtb.ProjectNameTb, Path = #"S:\\xxxx\\" + dtb.ProjectNameTb },
Transaction = transaction != null ? transaction : new Transaction { Name = dtb.TransactioNameTb },
DateTime = dtb.WriteDateTimeTb.Value
});
dbContext.MonitorControl.Add(
new MonitorControl
{
ElementId = dtb.ElementIdTb.Value,
Category = category.Where(x => x.Id == dtb.CategoryIdTb).FirstOrDefault(),
TransactBoard = transactBoard
});
}
This is what I did on T-SQL:
begin tran
insert dbo.TransactionBoard(TrancationId, UserId, ActionId, ProjectId, [DateTime] )
select t.Id as TrancationId, u.Id as UserId, s.ActionTb, p.Id as ProjectId, s.WriteDateTimeTb
from monitorControlDb.dbo.MonitorlControlTable s
left join dbo.[Transaction] t
on t.[Name] = s.TransactioNameTb
left join dbo.[User] u
on u.[Name] = s.UserNameTb
left join dbo.Project p
on p.[Name] = s.ProjectNameTb
insert dbo.MonitorControl(ElementId, CategoryId)
select s.ElementIdTb, s.CategoryIdTb
from monitorControlDb.dbo.MonitorlControlTable s
commit