We can use the method Convert.ToInt() method in C# to convert a number string to an octal value. For example, we can use this method to convert the number string 30 to a base number of 8, which is an octal value.
Convert.ToInt32(numberString, 8)
numberString: This is the number string that we want to convert to an octal value.
The value returned is an octal equivalent to the number string.
using System;class HelloWorld{static void Main(){// Creating some number stringsstring num1 = "34";string num2 = "1";string num3 = "222";// Converting to Octal and printing the resultsConsole.WriteLine("{0} {1}", num1, Convert.ToInt32(num1, 8));Console.WriteLine("{0} {1}", num2, Convert.ToInt32(num2, 8));Console.WriteLine("{0} {1}", num3, Convert.ToInt32(num3, 8));}}
Convert.ToInt32() method. Then, we print the values to the console.