title: c# add new namespace to project
body: <p>How can I add a namespace to a c# project? I am a beginner.</p>
  
  <pre><code>if(!string.IsNullOrEmpty(result))
  {
      CoderBuddy.ExtractEmails helper = new CoderBuddy.ExtractEmails(result);
      EmailsList = helper.Extract_Emails;
  }
  </code></pre>
  
  <p>My Form1 needs to use the namespace below:</p>
  
  <pre><code>// this is the file that I need to add
  using System;
  using System.Collections.Generic;
  using System.Text;
  using System.Text.RegularExpressions;
  namespace Coderbuddy
  {
      public class ExtractEmails
      {
          private string s;
          public ExtractEmails(string Text2Scrape)
          {
              this.s = Text2Scrape;
          }
          public string[] Extract_Emails()
          {
              string[] Email_List = new string[0];
              Regex r = new Regex(@"[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,6}", RegexOptions.IgnoreCase);
              Match m;
              //Searching for the text that matches the above regular expression(which only matches email addresses)
              for (m = r.Match(s); m.Success; m = m.NextMatch())
              {
                  //This section here demonstartes Dynamic arrays
                  if (m.Value.Length &gt; 0)
                  {
                      //Resize the array Email_List by incrementing it by 1, to save the next result
                      Array.Resize(ref Email_List, Email_List.Length + 1);
                      Email_List[Email_List.Length - 1] = m.Value;
                  }
              }
              return Email_List;
          }
      }
  }
  </code></pre>