LINQ (Language
practice.

Which LINQ operator is used to return a specified number of contiguous elements from the end of a sequence?

In LINQ, what does the Reverse operator do?

What is the purpose of the Zip operator in LINQ?

Which LINQ operator is used to return elements from a sequence until a specified condition becomes false?

In LINQ, what does the ElementAtOrDefault operator do?

Can we use linq to query against a DataTable?

Which operator among the following supplies the information about the characteristics of a typeof?

What will be the output of the following C# code snippet?

class Program
{
    static void Main(string[] args)
    {
        int[] nums = { 1, -2, 3, 0, -4, 5 };
        var posNums = nums.Where(n => n < 10).Select(r => r%3);
        Console.Write("The values in nums: ");
        foreach (int i in posNums) Console.Write(i + " ");
        Console.WriteLine();
        Console.ReadLine();
    }
}

Assume 2 columns named as Product and Category how can be both sorted out based on first by category and then by product name?

What will be the output of the following C# code snippet?

class B { }
class A : B { }
class Program
{
    static void Main(string[] args)
    {
        A a = new A();
        B b = new B();
        if (a is A) 
        Console.WriteLine("a is an A");
        if (b is A)
        Console.WriteLine("b is an A because it is derived from A");
        if (a is B)
        Console.WriteLine("This won’t display -- a not derived from B");
        Console.ReadLine();
    }
}

What will be the output of the following C# code snippet?

class Program
{
    static void Main(string[] args)
    {
        string[] strs = { ".com", ".net", "facebook.com", "google.net", 
                         "test", "netflix.net", "hsNameD.com" };
        var netAddrs = from addr in strs
                       where addr.Length > 4 && addr.EndsWith(".net",
                       StringComparison.Ordinal)
                       select addr;
        foreach (var str in netAddrs) Console.WriteLine(str);
        Console.ReadLine();
    }
}

What will be the output of the following C# code snippet?

class Program
{
    static void Main(string[] args)
    {
        int[] nums = { 1, -2, 3, 0, -4, 5 };
        var posNums = nums.Where(n => n > 0).Select(r => r*2).
                      OrderByDescending(r=>r);
        Console.Write("The positive values in nums: ");
        foreach(int i in posNums) 
        Console.Write(i + " ");
        Console.WriteLine();
        Console.ReadLine();
    }
}

What will be the output of the following C# code snippet?

class UseTypeof 
{
    static void Main() 
    {
        Type t = typeof(StreamReader);
        Console.WriteLine(t.FullName);
        if(t.IsClass) Console.WriteLine("Is a class.");
        if(t.IsAbstract) Console.WriteLine("Is abstract.");
        else Console.WriteLine("Is concrete.");
    }
}

What will be the output of the following C# code snippet?

static void Main(string[] args)
{
    int[] nums = { 5, 4, 6, 3, 14, 9, 8, 17, 1, 24, -1, 0 };
    Array.Sort(nums);
    int idx = Array.BinarySearch(nums, 14);
    if (idx == 9)
    {
        Console.WriteLine(Convert.ToBoolean(1));
    }
    else
   {
       Console.WriteLine(Convert.ToBoolean(0));
   }
   Console.WriteLine("Index of 14 is " + idx);
   Console.ReadLine();
}

Choose the namespace in which Expression trees are encapsulated?

Which mechanism among the following helps in identifying a type during the execution of a program?

In the following C# code, which query will work according to the set of code?

class Program
{
    static void Main(string[] args)
    {
        int[] nums = { 1, -2, 3, 0, -4, 5 };
        int len = /*_________________ */
        Console.WriteLine("The number of positive values in nums: " + len);
        Console.ReadLine();
    }
}

Choose the correct statement about the IComparer interface in C#?

What will be the output of the following C# code snippet?

class Program
{
    static void Main(string[] args)
    {
        int[] nums = {1};
        var posNums = from n in nums
                      wheres n > 0 
                     select Math.Max(78, 9);
        Console.Write("The largest values in nums: ");
        foreach (int i in posNums) Console.Write(i + " ");
        Console.WriteLine();
        Console.ReadLine();
    }
}

What does the following property defined in the array class defines in C#?

public bool IsReadOnly { get; }