How do I add a condition to check string length equals zero?

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C#

XML

I have C# code if statement where I want to add a condition to check if string length for RescheduledReason = 0

Here is what xml code look like

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

Here is my if statement in C#

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

How do I add checking string length RescheduledReason = 0?

What I have tried:

My code that I need help with to add string length RescheduledReason = 0?

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