title: Get input from console into a form
body: <p>I want to see how I can get the value entered in this console application to work inside a form textbox how can I do this? </p>
  
  <p>Example entering 00000000 in console to be as if it were entered in the form so I guess I want them to be separate but work seamless any ideas. I cant figure out how to get the textbox to get the contents from the Console.Readline() of the console application.</p>
  
  <p><strong><em>This is and example of how I am trying to get it to work</em></strong></p>
  
  <p><img src="https://i.stack.imgur.com/bAcDJ.jpg" alt="alt text"></p>
  
  <p><img src="https://i.stack.imgur.com/XXbNj.jpg" alt="alt text"></p>
  
  <pre><code>public static void Main(string[] args)
      {
          Console.Write("Enter a valid 10 digit ISBN Number ");
          string isbn = isbnChecker.DestabilizeIsbn(Console.ReadLine()); // Normalizes the input and puts it on string "str"
          if (isbn.Length &gt; 10 || isbn.Length &lt; 9) // If the string length is greather than 10, or smaller than 9
          {
              Console.WriteLine("The number you have entered is not a valid ISBN try again."); // Print invalid number
              Console.ReadLine();
          }
          else if (isbn.Length == 10) // If the length is 10
          {
              if (isbnChecker.CheckNumber(isbn)) // If function CheckNum return "true"...
                  Console.WriteLine("The number you have entered is a valid ISBN");
  
              else // If it returns "false"...
                  Console.WriteLine("The number you have entered is not a valid ISBN try again.");
                  Console.ReadLine();
          }
          else // Else (If the number is NOT greater than 10 or smaller than 9, NOR is it 10 -&gt; If the number is 9)
          {
              Console.WriteLine("The Check digit that corresponds to this ISBN number is " + checkIsbnClass.CheckIsbn(isbn) + "."); // Print the checksum digit
              Console.ReadLine();
          }
  
  
  
      }
  
  
  
  
  
  public static class isbnChecker
      {
          public static bool CheckNumber(string isbn) // Checks if the checksum digit is correct
          {
              if (isbn[9].ToString() == checkIsbnClass.CheckIsbn(isbn)) // If the 10th digit of the number is the same as the calculated digit...
                  return true;
              else // If they're not the same...
                  return false;
          }
          public static string DestabilizeIsbn(string isbn) // replace the string
          {
              return isbn.Replace("-", "").Replace(" ", "");
          }
      }
    [1]: http://i.stack.imgur.com/bAcDJ.jpg
    public static string CheckIsbn(string isbn) // Calculates the 10th digit of a 9-digits partial ISBN number
          {
              int sum = 0;
              for (int i = 0; i &lt; 9; i++) // For each number...
              {
                  sum += int.Parse(isbn[i].ToString()) * (i + 1); // ...Multiply the number by it's location in the string
              }
              if ((sum % 11) == 10) // If the remainder equals to 10...
              {
                  return "x"; // Output X
              }
              else // If it does not equal to 10...
              {
                  return (sum % 11).ToString(); // Output the number
              }
          }
        public static bool CheckNumber(string isbn) // Checks if the checksum digit is correct
          {
              if (isbn[9].ToString() == CheckIsbn(isbn)) // If the 10th digit of the number is the same as the calculated digit...
                  return true;
              else // If they're not the same...
                  return false;
          }
        public static string DestabilizeIsbn(string isbn) // replace the string
        {
            return isbn.Replace("-", "").Replace(" ", "");
        }
  
      }
  
  
  public partial class IsbnForm : Form
  {
  public IsbnForm()
  {
      InitializeComponent();
  }
  
  private void textBox1_TextChanged(object sender, EventArgs e)
  {
      this.xInputTextBox.Text = "Enter a Valid ISBN";
  }
  </code></pre>
  
  <p>}</p>