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[DllImport("Advapi32.dll", SetLastError=true, EntryPoint="CredWriteW", CharSet=CharSet.Unicode)]

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static extern bool CredWrite([In] ref Credential userCredential, [In] UInt32 flags);

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Declare Function CredWrite Lib "advapi32.dll" (TODO) As TODO

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     if (!Unmanaged.CredWrite(ref userCredential, 0))

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[DllImport("Advapi32.dll", SetLastError=true, EntryPoint="CredWriteW", CharSet=CharSet.Unicode)]

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public static extern bool CredWrite([In] ref Credential userCredential, [In] UInt32 flags);

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[ADVAPI32.Util]::CredWrite([ref]$cred,0)

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Documentation

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/secauthn/security/credwrite.asp