# C# Program to find Sum of Series[1+11+111+ 1111+.. n]terms

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 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);
}
}
}
``````

## 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:

1. Receive the input from the user for the number of terms in the series. This is done using the `int.Parse(Console.ReadLine())` method.
2. 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.
3. 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.
4. After the loop has completed, the sum of the series is printed.
5. Finally, the program waits for the user to press Enter, using `Console.ReadLine()`, before terminating.

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