title: Eval Check String Null or Empty
body: <pre><code>&lt;asp:TemplateField HeaderText="Customer Account Name"&gt;
       &lt;ItemTemplate&gt;
           &lt;asp:Label ID="lblRecieverClientAccountName" runat="server" 
                Text='&lt;%#Eval("RecieverClientAccountName").ToString()) ? 
                 String.Empty : 'Invalid Account number'
                 ,"RecieverClientAccountName" %&gt;'&gt;&lt;/asp:Label&gt;
       &lt;/ItemTemplate&gt;
  &lt;/asp:TemplateField&gt;
  </code></pre>
  
  <p>I need  to check  string is empty and show  a custom message .It gives me an error "The server tag is not well formed."</p>