title: Why is my RadioButtonList selectedValue empty?
body: <p>I have a RadioButtonList:</p>
  
  <pre><code>&lt;asp:RadioButtonList ID="rblMedicationTime" runat="server"  onselectedindexchanged="rblMedicationTime_SelectedIndexChanged"  DataSourceID="dtsMedicationTime" DataTextField="LookupItem" DataValueField="Id"  AutoPostBack="true"&gt;&lt;/asp:RadioButtonList&gt;
  </code></pre>
  
  <p>On page load, I want to select a radio button from the list and set its value, for which I have written this line of code:</p>
  
  <pre><code>rblMedicationTime.SelectedValue = clientMedicationSchedule.glTypeId.ToString();
  </code></pre>
  
  <p>The RadioButtonList is populating successfully, but the value is unable to be selected.</p>
  
  <p><code>rblMedicationTime.SelectedValue</code> is always "" when I debug the code.</p>