title: Change asp message box header / title
body: <p>How can I change the title of my message box 
  <img src="https://i.stack.imgur.com/yvtc5.jpg" alt="enter image description here"></p>
  
  <p>Here is my code-behind: </p>
  
  <pre><code> string myStringVariable1 = string.Empty;
                      myStringVariable1 = "Policy Number:" + "  " + txtPolNo.Text.ToString() + "  " + "with Issuance office:" + "  " + dropIssOff.Text.ToString() + "  " + "was not found on the database. Please make sure that your inputs are correct.";
                      ClientScript.RegisterStartupScript(this.GetType(), "myalert", "alert('" + myStringVariable1 + "');", true);
  </code></pre>