How do I check string length of xml element equals zero?

Question

I have the following xml code and I would like to check for string length for Rescheduled =0 in my if statement.

Here is the xml code

<xsl:when test="(Cancelled='True') and (string-length(RescheduledReason)=0)">Cancelled</xsl:when>

Here is my if statement that I would like to add string length for RescheduledReason =0 as a condition.

How do I do it?

My C# code

//HearingCancelled 
if ((objxmlNode.SelectSingleNode("Cancelled") != null) && (objxmlNode.SelectSingleNode("Cancelled").InnerText == "True"))
{
                            
  objPrepHearDoc.Hearing.Settings[i].SettingStatus = "Cancelled";
}