title: Access One WindowsForm label to another form in C#
body: <p>I am using two windows form application, and I want to set 1st form label's value from 2nd form. 
  But when I access 1st form label in 2nd form then application show this error </p>
  
  <p><code>Object reference not set to an instance of an object.</code></p>
  
  <p>I am using this statement to access</p>
  
  <pre><code>login_form.ActiveForm.Controls["label_name"].Text = "Hello World";
  </code></pre>
  
  <p>sometime i worked fine but some time show this error</p>
  
  <p>Please solve my problem. I will be very thankful to you.</p>