title: Multiple textbox value addition using single button click event
body: <p>I have 15 text boxes and 1 button in my Windows application.</p>
  
  <p>What I want to do is to add the value of 15 text box using single button click event. Is it possible??</p>
  
  <p>I tried to declare an array and then for loop on array, but it shows an error "cannot convert to int"</p>
  
  <pre><code>private void button1_Click(object sender, EventArgs e)      
  {
      int i;
      int j = 0;
      while (i &lt;= r15c5)
      {
          j = j + i;
          j--;
      }
  }
  </code></pre>