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Replace the Message ([login to view URL]) content with altered soap xml. If any xml element of SOAP message in the "ref Message reply" paramte has a value of "0E-number" eg: 0E-7 then replace it with 0 and update the "ref Message reply" paramter, You should retain the same xml format. Just replace only those values if found. See the attached code /// <summary> /// Allows adding in WS-Security header to incoming request /// </summary> public class TestMessageInspector : IClientMessageInspector { ....... public void AfterReceiveReply(ref Message reply, object correlationState) { // Here Need to replace or alter the reply Message ([login to view URL]) content with other soap xml. Tried the below code and it does not alter the reply message content var sb = new StringBuilder("<testAmt>88977</testAmt>"); using (var sw = [login to view URL](new StringWriter(sb))) { [login to view URL](sw); [login to view URL](); } } } Sample Input: <? xml version='1.0' encoding='utf-16'?><SOAP-ENV:Envelope xmlns:SOAP-ENV='[login to view URL]'><SOAP-ENV:Header/><SOAP-ENV:Body>< ns4:testResponse xmlns:ns2 = '[login to view URL]' xmlns:ns4 ='[login to view URL]'><Document><testAmt >0E-7</testAmt><testRate>0</testRate><test1Amt>0E-8</test1Amt></Document></ns4:testResponse></SOAP-ENV:Body></SOAP-ENV:Envelope> Sample Output: <? xml version='1.0' encoding='utf-16'?><SOAP-ENV:Envelope xmlns:SOAP-ENV='[login to view URL]'><SOAP-ENV:Header/><SOAP-ENV:Body>< ns4:testResponse xmlns:ns2 = '[login to view URL]' xmlns:ns4 ='[login to view URL]'><Document><testAmt >0</testAmt><testRate>0</testRate><test1Amt>0</test1Amt></Document></ns4:testResponse></SOAP-ENV:Body></SOAP-ENV:Envelope> Please refer the comments in the code and ask me for any details Getting the below output and format is automatically updated by .NET which is undesirable <s:Envelope xmlns:s="[login to view URL]"> <s:Header> <Action s:mustUnderstand="1" xmlns="[login to view URL]" /> </s:Header> <s:Body> <string xmlns="[login to view URL]">&lt;? xml version='1.0' encoding='utf-16'?&gt;&lt;SOAP-ENV:Envelope xmlns:SOAP-ENV='[login to view URL]'&gt;&lt;SOAP-ENV:Header/&gt;&lt;SOAP-ENV:Body&gt;&lt; ns4:testResponse xmlns:ns2 = '[login to view URL]' xmlns:ns4 ='[login to view URL]'&gt;&lt;Document&gt;&lt;testAmt &gt;0E-7&lt;/testAmt&gt;&lt;testRate&gt;0&lt;/testRate&gt;&lt;test1Amt&gt;0E-8&lt;/test1Amt&gt;&lt;/Document&gt;&lt;/ns4:testResponse&gt;&lt;/SOAP-ENV:Body&gt;&lt;/SOAP-ENV:Envelope&gt;</string> </s:Body> </s:Envelope>