C#

int[] someArray = new int[5]; // Array definition

for (int counter = 0; counter < 5; counter++) { // Loop
   someArray[counter] = counter;
}

YourType[] yourArray = new YourType[noitems]

YourType yourArrayVariable = yourArray[yourIndex];

YourType[,] yourTable = new YourType[6,2];

YourType[][] jaggedArray = new YourType[3][];
jaggedArray[0] = new YourType[3];    //<----- jaggedArray[0] is a single-dimensional array of type YourType
jaggedArray[0][2] //<----- This is a single variable of type YourType


Loops are a completely different thing.
A loop enables you to do something repeatedly while a condition is true.

While loops will do the instructions inside their body while a condition is true. The condition is evaluated before the loop starts and, if it is false, the loop does not start.
<pre lang="c#">
while (condition){
//do something if condition is true
}

do{
//do something
}while(condition);

for (declaration;condition;instruction){
//do something
}

for(int i = 0;i<5;i++){
}

string[] lines = new string[10];
for(int i = 0;i<10;i++){
Console.WriteLine(lines[i]);
}

string[] lines = new string[10];
int i;
for(i = 0;i<10;i++){
Console.WriteLine(lines[i]);
}

int[] integers = new int[20];
foreach(int i in integers){
Console.WriteLine(i);
}

public class Foo
{
    public event EventHandler<EventArgs> MyEvent;
    
    public void Test()
    {
        var handler = MyEvent;
        if (handler != null) handler(this, EventArgs.Empty);
    }
}

public class Bar
{
    private readonly Foo _foo;
    
    public Bar()
    {
        _foo = new Foo();
        _foo.MyEvent += MyEventHandler;
    }
    
    public void Test()
    {
        _foo.Test();
    }
    
    private void MyEventHandler(object sender, EventArgs e)
    {
        // Not static!
        Console.WriteLine("Bacon.");
    }
}

foreach (string reason in robotRegisterReasons)
                        sw.WriteLine(reason);

private void btnInputBox_Click(object sender, EventArgs e)
       {

           int[,] toyArray = new int[4, 5]; ////4,5
           var totalToys = 0;//variable to hold and  accumulate the total

           string[] dayNameArray = { "Monday", "Tuesday", "Wednesday", "Thursday", "Friday" };
           string specDay;
           int specWeek;
           string val = "";
           int specDayTotal;
           string Output = "";
           string Output1 = "Retrieve Products produced On A specific day";
           string Output2 = " Products produced On That day are:";
           string Output3 = "Sum of All Products Made = ";
           int num = 0;
           int Days=0;
           string dOW = "";
           for (int row = 0; row < toyArray.GetLength(0); row++)//enters loop to store data to array ,starts first row
           {
               for (int Col = 0; Col < toyArray.GetLength(1); Col++)//starts first column...
               {

                   val = Microsoft.VisualBasic.Interaction.InputBox("How Many Toys Made for Week:" + (row + 1) + "  " + dayNameArray[Col] + ":  ");//gets the string value of number entered
                   try
                   {
                       while (!(int.TryParse(val, out num)))//converts the string to a int to validate.. if the number IS NOT a Number eg.letter
                       {
                           MessageBox.Show("Not a valid number, try again.");//then sends this message
                           val = Microsoft.VisualBasic.Interaction.InputBox("How Many Toys Made for Week:" + (row + 1) + "  " + dayNameArray[Col] + ":  ");//re enter a number
                       }
                   }
                   catch (Exception)
                   {
                       MessageBox.Show("Value entered is not in a valid format");//exception message
                   }
                   toyArray[row, Col] = num;//else it stores this number for the array

               }//goes out to check next col of the row  once all columns done it goes to nEXT Row

           }
           //once ALL Rows checked it comes outta loop


           for (int row = 0; row < toyArray.GetLength(0); row++)//enters new loop to write data
           {

               for (int Col = 0; Col < toyArray.GetLength(1); Col++)
               {


                   Output += "          " + toyArray[row, Col] + "          ";
                   totalToys += toyArray[row, Col];

               }

               Output += "  " + "\r\n" + "";//first row checked sets a space between rows

           }

           specDay = Microsoft.VisualBasic.Interaction.InputBox("What Day Would You Like To Check:");// to find specific toys made on a specific day
           string sPattern = "^(Mon|(T(ues|hurs))|Fri)(day|\\.)?$|Wed(\\.|nesday)?$|T((ue?)|(hu?r?))\\.?$";//checks the entered data is a viable string(\\Length{3}?$)

           int result = Array.BinarySearch(dayNameArray, specDay, StringComparer.OrdinalIgnoreCase);

               if (System.Text.RegularExpressions.Regex.IsMatch(specDay, sPattern, System.Text.RegularExpressions.RegexOptions.IgnoreCase))
               {

                   for (int dayCounter = 0; dayCounter < dayNameArray.GetLength(0); dayCounter++)//start loop number daycounter at 0 ,day counter of the length of array which will be 4(0-4) then add one to the count
                   {
                       if (dayNameArray[dayCounter] == specDay) // Compare specDay to the current index of the dayNameArray.If it finds a match
                       {
                           Days = dayCounter;//finds  the count and declares it as an int(eg. monday matches 0)
                       }
                   }

           }
           else
           {
               MessageBox.Show("Not A valid Day Of Week");
               specDay = Microsoft.VisualBasic.Interaction.InputBox("What Day Would You Like To Check:");
           }

           specWeek = Int32.Parse(Microsoft.VisualBasic.Interaction.InputBox("What week Would You Like To Check:"));
               try
               {
                   while (!(specWeek <= 4)&& !(specWeek == num))//converts the string to a int to validate.. if the number IS NOT a Number eg.letter
                   {
                       MessageBox.Show("Not a valid number, try again.");//then sends this message
                       specWeek = Int32.Parse(Microsoft.VisualBasic.Interaction.InputBox("What week Would You Like To Check:"));//re enter a number
                   }
               }
               catch (Exception)
               {
                   MessageBox.Show("Must Be 1 to 4");//exception message

               }
           int Week = specWeek-1;


           specDayTotal = toyArray[Week, Days];

           txtOutput.Text += "          " + "Monday       Tuesday       Wednesday        Thursday        Friday  " + "\r\n" + Output + "         " + Output1 + "\r\n" + "   " + specDay + "    Week " + (Week+1) + "\r\n" + Output2 + "   =  " + specDayTotal + "\r\n" + Output3 + totalToys;
           }

       }