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How to change specific tag inside tag value in XML using C#? (Below is my sample xml file)

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<?xml version="1.0" encoding="UTF-8"?><!--Program Launch Time:Friday, February 14, 2014 6:23:09 PM--><Root><AC_Name><![CDATA[ssssss]]></AC_Name><AC_Settings><IsPowerToggleType>False</IsPowerToggleType><IsTemperatureIncDecType>False</IsTemperatureIncDecType><TemperatureSetpointRollOverType>NA</TemperatureSetpointRollOverType><TemperatureUnits>Celcius</TemperatureUnits><TemperatureStepSize>1.0</TemperatureStepSize><TemperatureMinimum>15</TemperatureMinimum><TemperatureMaximum>30</TemperatureMaximum><IsExtraCommandNeededForTemperatureSetpoint>False</IsExtraCommandNeededForTemperatureSetpoint></AC_Settings><IR_DataBase><!--IR Learning Time:Friday, February 14, 2014 6:23:25 PM--><SingleIR_Data><IR_CommandName><![CDATA[POWER ON]]></IR_CommandName><Frequency>38</Frequency><IR_DataValue><![CDATA[8925 4125 575 1475 575  6350]]></IR_DataValue><IR_DataCCF_Value><![CDATA[0000 0000F5]]></IR_DataCCF_Value></SingleIR_Data><!--IR Learning Time:Friday, February 14, 2014 6:23:30 PM--><SingleIR_Data><IR_CommandName><![CDATA[TEMP UP 16-17]]></IR_CommandName><Frequency>38</Frequency><IR_DataValue><![CDATA[8925 4125 575 1475 575  6350]]></IR_DataValue><IR_DataCCF_Value><![CDATA[0000 006B 001E 0000 00F5]]></IR_DataCCF_Value></SingleIR_Data><!--IR Learning Time:Friday, February 14, 2014 6:23:37 PM--><SingleIR_Data><IR_CommandName><![CDATA[TEMP UP 17-18]]></IR_CommandName><Frequency>38</Frequency><IR_DataValue><![CDATA[8950 4100 550 1500 575  6350]]></IR_DataValue><IR_DataCCF_Value><![CDATA[0000 006C 001E 000000F3]]></IR_DataCCF_Value></SingleIR_Data><!--IR Learning Time:Friday, February 14, 2014 6:23:45 PM--><SingleIR_Data><IR_CommandName><![CDATA[TEMP DOWN 25-24]]></IR_CommandName><Frequency>38</Frequency><IR_DataValue><![CDATA[8900 4125  1525 550 6350]]></IR_DataValue><IR_DataCCF_Value><![CDATA[0000  0015 00F5]]></IR_DataCCF_Value></SingleIR_Data><!--IR Learning Time:Friday, February 14, 2014 6:23:48 PM--><SingleIR_Data><IR_CommandName><![CDATA[TEMP DOWN 20-19]]></IR_CommandName><Frequency>38</Frequency><IR_DataValue><![CDATA[8950 4100  550 6350]]></IR_DataValue><IR_DataCCF_Value><![CDATA[0000 006B  0015 00F5]]></IR_DataCCF_Value></SingleIR_Data><!--IR Learning Time:Friday, February 14, 2014 6:23:52 PM--><SingleIR_Data><IR_CommandName><![CDATA[POWER OFF]]></IR_CommandName><Frequency>38</Frequency><IR_DataValue><![CDATA[8925 4150 550 6350]]></IR_DataValue><IR_DataCCF_Value><![CDATA[0000 006B  0015 00F5]]></IR_DataCCF_Value></SingleIR_Data></IR_DataBase></Root>

Language C#

As per my requirement,  if the IR_Command_Name is "TEMP DOWN 20-19", IR Datavalue innertext nneds to change to "some value XXXXXXX" and also IR Data CCF Value also needs to change to "some thing value".

Please help me to do this.





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