using System;  

public class Exercise39 

{  

public static void Main()

{

int i, sum=0;

​

Console.WriteLine("Enter the number in BeginNumberTextBox:");

int BeginNumberTextBox = Convert.ToInt32(Console.ReadLine()); 

​

Console.WriteLine("Enter the number in StopNumberTextBox:");

int StopNumberTextBox = Convert.ToInt32(Console.ReadLine());

​

Console.Write("\n\n");

Console.Write("sum of all integer between BeginNumberTextBox  and StopNumberTextBox is:\n");

Console.Write("-----------------------------------------------------------------------------");

Console.Write("\n\n");     

for(i=BeginNumberTextBox;i<StopNumberTextBox;i++)

{

   sum+=i;

}

Console.Write("\n\nThe sum : {0} \n",sum);

}

}