How to add windows local user to Administrators group in Windows 2012 R2 OS using C# code

facing issue to add windows local user to add Administrator group using C# code in Windows Server 2012 R2 OS...

Any one have code related to this please share....I googled it found few code but that works only on Windows Server 2012 OS but not on Windows Server 2012 R2
Ramakrishna JulooriAsked:
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Michael FowlerSolutions ConsultantCommented:
One of the easiest ways could be to use command line calls

string strCmdText;
strCmdText= "net user /add useraccountname mypassword";

string strCmdText2;
strCmdText2= "net localgroup administrators useraccountname /add";

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