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NetGetDCName (netapi32)
The NetGetDCName function returns the name of the primary domain controller (PDC). It does not return the name of the backup domain controller (BDC) for the specified domain. Also, you cannot remote this function to a non-PDC server.

C# Signature:

static extern NetApiStatus NetApiBufferFree(IntPtr Buffer);

[DllImport("Netapi32.dll", CharSet=CharSet.Unicode)]
static extern NetApiStatus NetGetDCName(string serverName, string domainName, out IntPtr buffer);

VB Signature:

  <DllImport("Netapi32.dll")> _
  Private Shared Function NetApiBufferFree(ByVal buffer As IntPtr) As NetApiStatus
  End Function

  <DllImport("Netapi32.dll", CharSet:=CharSet.Unicode)> _
  Private Shared Function NetGetDCName(ByVal serverName As String, ByVal domainName As String, ByRef buffer As IntPtr) As NetApiStatus
  End Function

C# User-Defined Types:

public enum NetApiStatus
    Success = 0,
    DCNotFound = 2453

VB User-Defined Types:

  Private Enum NetApiStatus
    Success = 0
    DCNotFound = 2453
  End Enum

Alternative Managed API:

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Tips & Tricks:

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C# Sample Code:

public static string GetDCName()
    IntPtr domainInfo = IntPtr.Zero;
    string dcName = String.Empty;

        NetApiStatus result = NetGetDCName(null, null, out domainInfo);
        if (result == NetApiStatus.Success)
            dcName = Marshal.PtrToStringAuto(domainInfo);

    return dcName;


VB Sample Code:

  Public Shared Function GetDCName() As String
    Dim domainInfo As IntPtr = IntPtr.Zero
    Dim dcName As String = String.Empty

      Dim result As NetApiStatus = NetGetDCName(Nothing, Nothing, domainInfo)
      If result = NetApiStatus.Success Then dcName = Marshal.PtrToStringAuto(domainInfo)
    End Try

    Return dcName
  End Function


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