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Here is source code of the C# Program to Perform Searching using Predefined Functions. The C# program is successfully compiled and executed with Microsoft Visual Studio. The program output is also shown below.

/*
 * C# Program to Perform Searching using Predefined Functions
 */
using System;
class linSearch
{
    public static void Main()
    {
        Console.WriteLine("Enter Number of Elements you Want to Hold in the Array? ");
        string s = Console.ReadLine();
        int x = Int32.Parse(s);
        int[] a = new int[x];
        Console.WriteLine("Enter Array Elements :");
        for (int i = 0; i < x; i++)
        {
            string s1 = Console.ReadLine();
            a[i] = Int32.Parse(s1);
        }
        Array.Sort(a);
        Console.WriteLine("Sorted Array : ");
        for (int i = 0; i < x; i++)
        {
            Console.WriteLine("{0}", a[i]);
        }
        Console.WriteLine("Enter the Element to be Searched : ");
        string s3 = Console.ReadLine();
        int x2 = Int32.Parse(s3);
        int x3 = Array.BinarySearch(a, (Object)x2);
        Console.WriteLine("BinarySearch: " + x3);
        Console.WriteLine("Element {0} is {1}", x3, a[x3]);
        Console.Read();
    }
}

In this C# program, we are reading the number of elements in the array using ‘x’ variable. Using for loop we are entering the coefficient values of an array using a[] array variable.

Using the sort() function the string is sorted. We are reading the element to be searching using ‘s3’ variable. Using BinarySearch() function we are searching a required element. Print the searched string in the given string.

 
Enter Number of Elements you Want to Hold in the Array ? 5
Enter Array Elements : 
2
3
1
4
5
Sorted Array :
1
2
3
4
5
Enter the Element to be Searched : 4
Binary Search : 3
Element 3 is 4