Define what is Where clause and Let clause in LINQ?

Answer 1

Where clause: It allows adding some conditional filters to the query.
Let clause: It allows defining a variable and assigning it a value calculated from the data values.

LINQ Query

var objresult = from emp in objEmployee
                            let totalSalary = objEmployee.Sum(sal =>  sal.Salary)
                            let avgSalary = totalSalary / 5
                            where avgSalary > emp.Salary
                            select emp;

Answer 2

Where clause: It allows us to add some conditional filters to the query.
Let clause: It allows us to define a variable and assigning it a value calculated from the data values.

 var arr = new[] { 5, 3, 4, 2, 6, 7 };
    var sq = from int num in arr
                    let square = num * num
                    where square > 10
                    select new { num, square };

    foreach (var a in sq)
        Console.WriteLine(a);