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static extern UInt32 NetValidateName(string lpServer,string lpName, string lpAccount,string lpPassword, int NameType);

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static extern UInt32 NetValidateName(string lpServer,string lpName, string lpAccount,string lpPassword, NET_SETUP_NAMETYPE NameType);

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    public static extern UInt32 NetValidateName(string lpServer,string lpName,string lpAccount,string lpPassword,

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    public static extern UInt32 NetValidateName(string lpServer,string lpName, string lpAccount,string lpPassword, int NameType);

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    UInt32 rtn = NetValidateName(null, "jrich523.wordpress.com", null, null, 3);

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    public static extern UInt32 NetValidateName(string lpServer,string lpName,string lpAccount,string lpPassword,

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[NetworkUtil]::NetValidateName($null,$name,$null,$null,$NameType)

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Documentation

[NetValidateName] on MSDN