**The Program in C# Program to find Sum of Series[1+11+111+ 1111+.. n]terms is given below:**

```
using System;
namespace SumOfSeries
{
class Program
{
static void Main(string[] args)
{
Console.WriteLine("Hello Codeauri Family, enter the number of terms in the series:");
int n = int.Parse(Console.ReadLine());
int sum = 0;
int number = 1;
for (int i = 0; i < n; i++)
{
Console.WriteLine(number);
sum += number;
number = number * 10 + 1;
}
Console.WriteLine("Okay, the sum of the series is: " + sum);
Console.ReadLine();
}
}
}
```

## Output:

Hello Codeauri Family, enter the number of terms in the series:2

1

11

Okay, the sum of the series is: 12

## Pro-Tips💡

Here are the step by step execution of above program:

- Receive the input from the user for the number of terms in the series. This is done using the
`int.Parse(Console.ReadLine())`

method. - Initialize a variable
`sum`

to store the sum of the series, and initialize a variable`number`

to store the current term in the series. Both variables are set to 0 and 1 respectively. - Use a for loop to iterate through the number of terms in the series. In each iteration, the current term is printed, and then added to the sum. The
`number`

variable is then updated by multiplying it by 10 and adding 1 to it. - After the loop has completed, the sum of the series is printed.
- Finally, the program waits for the user to press Enter, using
`Console.ReadLine()`

, before terminating.

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