Hi Im currently a student trying to figure out how to search a 2D Array in C#. The program that Im trying to make is an Address Book. Basically I want to search the array for a keyword such as "First Name", I then want to be able to print the result of that search and be able to edit that part of the array. Im just wondering if anyone knows a particular syntax such as Array.Find("First Name"). Heres the code, and thanks for looking and helping me. :)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication9
{
    class AddressBook
    {
        static void Main(string[] args)
        {
            string InputSelection;
            char Selection_Char;

            string[,] AddressBook = new string[10, 2]//this is the array
    {
        {"First Name", "Last Name"},//i want to be able to search this array for First Name
	    {"XXXXX", "XXXXX"},
	    {"XXXXX", "XXXXX"},
	    {"XXXXX", "XXXXX"},
	    {"XXXXX", "XXXXX"},
        {"XXXXX", "XXXXX"},
	    {"XXXXX", "XXXXX"},
	    {"XXXXX", "XXXXX"},
	    {"XXXXX", "XXXXX"},
	    {"XXXXX", "XXXXX"}
	};
        Start:
            Console.WriteLine("==========Address Book==========");
            Console.WriteLine("Press 1 to Add an Entry.");
            Console.WriteLine("Press 2 to Delete an Entry.");
            Console.WriteLine("Press 3 to Print Book to Screen.");
            InputSelection = Console.ReadLine();
            Selection_Char = Convert.ToChar(InputSelection);// Converts the Users input to char

Yes its a requirement, I was thinking of using a collection but I have to use an Array, Thanks for the quick reply though

Thank you Antenka, but I've actually managed to figure out how to search the whole array.My only problem is now that I cant print out the location of the result in the array like say AddressBook[0,1] so that my program can just immediately edit that row and column of the array. But heres the code:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication9
{
    class AddressBook
    {
        static void Main(string[] args)
        {
            string InputSelection;
            char Selection_Char;

            string[,] AddressBook = new string[10, 2]//this is the array
    {
        {"First Name", "Last Name"},//i want to be able to search this array for First Name
	    {"XXXXX", "XXXXX"},
	    {"XXXXX", "XXXXX"},
	    {"XXXXX", "XXXXX"},
	    {"XXXXX", "XXXXX"},
        {"XXXXX", "XXXXX"},
	    {"XXXXX", "XXXXX"},
	    {"XXXXX", "XXXXX"},
	    {"XXXXX", "XXXXX"},
	    {"XXXXX", "XXXXX"}
	};
        Start:
            Console.WriteLine("==========Address Book==========");
            Console.WriteLine("Press 1 to Add an Entry.");
            Console.WriteLine("Press 2 to Delete an Entry.");
            Console.WriteLine("Press 3 to Print Book to Screen.");
            InputSelection = Console.ReadLine();
            Selection_Char = Convert.ToChar(InputSelection);// Converts the Users input to char


            if (Selection_Char == '1')
            {
                Console.WriteLine("First Name: " + AddressBook[0, 0] + ". Last Name: " + AddressBook[0, 1] + ".");
                Console.WriteLine("First Name: " + AddressBook[1, 0] + ". Last Name: " + AddressBook[1, 1] + ".");
                Console.WriteLine("First Name: " + AddressBook[2, 0] + ". Last Name: " + AddressBook[2, 1] + ".");
                Console.WriteLine("Please enter the First Name for Contact 1.");
                AddressBook[0, 0] = Console.ReadLine();
                Console.WriteLine("Please enter the Last Name for Contact 1.");
                AddressBook[0, 1] = Console.ReadLine();
                Console.WriteLine("Address Book has now been updated.");
                Console.WriteLine("First Name: " + AddressBook[0, 0] + ", Last Name: " + AddressBook[0, 1] + ".");

                for (int i = 0; i < 10; i++)
                { //10 is the number of rows in the 2D table-like array
                    for (int j = 0; j < 2; j++)
                    { //2 is the number of columns in the 2D table-like array
                        string SearchInput = Console.ReadLine();
                        if (AddressBook[i, j].Equals(SearchInput, StringComparison.OrdinalIgnoreCase))
                        {
                           
                            Console.WriteLine("they match");
                            Console.ReadLine();
                            goto Start;
                        }
                        else
                        {
                            Console.WriteLine("Sorry they dont match.");
                            goto Start;
                        }

                    }


                }

I was thinking the same thing lol, but I dont have a clue how Im going to code it:-/

Uhm .. owkey .. let's try to compose it. For example, you found a match in the element AddressBook[0,1], so you need to write the exact "AddressBook[0,1]".

Let's divide this string into 2 parts:
1. Static. Means that it would remain the same for each output: "AddressBook[", "," and "]".
2. Dynamic. Means that you have to obtain it's value each time: "i" and "j"

To concatenate your strings you use "+" sign.
The most interesting part is that you already have such combined output in your code, e.g. here:

Console.WriteLine("First Name: " + AddressBook[0, 0] + ". Last Name: " + AddressBook[0, 1] + ".");

Now, try to compose ... ;)

:P Ohhhh now I get it, Thanks.
But another problem came out of nowhere >.<
Im getting an error where the j is, saying its unreachable code?

if (Selection_Char == '4')

                    for (int i = 0; i <= 10; i++)
                    { //10 is the number of rows in the 2D table-like array
                        for (int j = 0; j <= 2; j++)//This j saying its unreachable code
                        { //2 is the number of columns in the 2D table-like array
                            Console.WriteLine("Type in what you wanna search:");
                            string SearchInput = Console.ReadLine();
                            if (AddressBook[i, j].Equals(SearchInput, StringComparison.OrdinalIgnoreCase))
                            {
                                Console.WriteLine("Match - " + AddressBook[i, j] + ".");
                                Console.WriteLine("they match");
                                Console.ReadLine();
                                goto Start;
                            }
                            else
                            {
                                Console.WriteLine("Sorry they dont match.");
                                goto Start;
                            }

                        }



                        //
                        //     {
                        //         string[] strArray = { "Trueman", "XXXXXX" };
                        //         string findThisString = Console.ReadLine();
                        //         int strNumber;
                        //         int strIndex = 0;
                        //         for (strNumber = 0; strNumber < strArray.Length; strNumber++)
                        //        {
                        //            strIndex = strArray[strNumber].IndexOf(findThisString);
                        //if (strIndex >= 0)
                        //                break;
                        //        }
                        //       Console.WriteLine("There is a match.",
                        //          strNumber, strIndex);
                        //

                        //     Console.ReadLine();
                        //       goto Start;
                    }

            }
        }
    }
}

Actually never mind, Ive debugged the code. Thankyou very much for you help Antenka. I will give you rep and Ill make this thread answered when Im finished. thanks again

Comments
Happy coding! ;)

The scope of visibility of a j is between {} of you cycle. Because it was declared in the for-cycle.

You have 2 ways to go:
1. Move declaration to a higher level to extend the boundaries, where this variable can be visible.
2. Save the value of j variable in a different variable with a larger scope. And then work with it.

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