C# forming Linq Query using .FindByExp

Question

Table 1

Id    Name
1     Tank 1
2     Tank 2
3     Tank 3
4     Tank 4

Table 2

Id   Name
1    Tank 1
2    Tank 2

Result List it should return

Id    Name
1     Tank 1
2     Tank 2
3     Tank 3
4     Tank 4

I need to form a linq query using.FindByExp only. Like below i need to use joins and arrive at above list Result.

var tankLst = context.Tank.FindByExp(a => a.Id== S.Id).ToList();

Answer 1

var distinctNames = context.Table1.FindAll().Select(x=>x.Name).Distinct().ToArray();
var tab1 = context.Table1.FindAll().ToList();
var tab2 = context.Table2.FindAll().Where(x=> !distinctNames.Contains(x.Name)).ToList();
var resultList = tab1.Concat(tab2).OrderBy(x=>x.Name);