public override int TotalPages { get; set; }

Public Overrides Property TotalPages As Integer
	Get
	Set

public:
virtual property int TotalPages {
	int get () override;
	void set (int value) override;
}

abstract TotalPages : int with get, set
override TotalPages : int with get, set

[C#]

void AssertIsTrue(bool condition)
{
    if (!condition)
    {
        throw new FormatException(string.Format("Expected true"));
    }
}

void AssertAreEqual(object actual, object expected)
{
    var areEqual = object.Equals(actual, expected);
    if (!areEqual && actual is Array && expected is Array)
    {
        var actualArray = (Array)actual;
        var expectedArray = (Array)actual;
        if (actualArray.Length == expectedArray.Length)
        {
            for (int i = 0; i < actualArray.Length; i++)
            {
                if (!object.Equals(actualArray.GetValue(i), expectedArray.GetValue(i)))
                {
                    break;
                }
            }

            areEqual = true;
        }
    }

    if (!areEqual)
    {
        throw new FormatException(
            string.Format("Actual value {0} are not equal to expected {1}.", actual, expected));
    }
}

void CheckSmartObjectResourceValues(object[] expectedValue, SmartObjectResource resource)
{
    AssertAreEqual(expectedValue[0], resource.IsCustom);
    AssertAreEqual(expectedValue[2], resource.PageNumber);
    AssertAreEqual(expectedValue[3], resource.TotalPages);
    AssertAreEqual(expectedValue[4], resource.AntiAliasPolicy);
    AssertAreEqual(expectedValue[5], resource.PlacedLayerType);
    AssertAreEqual(8, resource.TransformMatrix.Length);
    AssertAreEqual((double[])expectedValue[6], resource.TransformMatrix);
    AssertAreEqual(expectedValue[7], resource.Value);
    AssertAreEqual(expectedValue[8], resource.Perspective);
    AssertAreEqual(expectedValue[9], resource.PerspectiveOther);
    AssertAreEqual(expectedValue[10], resource.Top);
    AssertAreEqual(expectedValue[11], resource.Left);
    AssertAreEqual(expectedValue[12], resource.Bottom);
    AssertAreEqual(expectedValue[13], resource.Right);
    AssertAreEqual(expectedValue[14], resource.UOrder);
    AssertAreEqual(expectedValue[15], resource.VOrder);

    AssertAreEqual(expectedValue[16], resource.Crop);
    AssertAreEqual(expectedValue[17], resource.FrameStepNumerator);
    AssertAreEqual(expectedValue[18], resource.FrameStepDenominator);
    AssertAreEqual(expectedValue[19], resource.DurationNumerator);
    AssertAreEqual(expectedValue[20], resource.DurationDenominator);
    AssertAreEqual(expectedValue[21], resource.FrameCount);
    AssertAreEqual(expectedValue[22], resource.Width);
    AssertAreEqual(expectedValue[23], resource.Height);
    AssertAreEqual(expectedValue[24], resource.Resolution);
    AssertAreEqual(expectedValue[25], resource.ResolutionUnit);
    AssertAreEqual(expectedValue[26], resource.Comp);
    AssertAreEqual(expectedValue[27], resource.CompId);
    AssertAreEqual(expectedValue[28], resource.OriginalCompId);
    AssertAreEqual(expectedValue[29], resource.PlacedId.ToString());
    AssertAreEqual(expectedValue[30], resource.NonAffineTransformMatrix);
    if (resource.IsCustom)
    {
        AssertAreEqual(expectedValue[31], resource.HorizontalMeshPointUnit);
        AssertAreEqual((double[])expectedValue[32], resource.HorizontalMeshPoints);
        AssertAreEqual(expectedValue[33], resource.VerticalMeshPointUnit);
        AssertAreEqual((double[])expectedValue[34], resource.VerticalMeshPoints);
    }
}

void SetNewSmartValues(SmartObjectResource resource, object[] newValues)
{
    // This values we do not change in resource
    newValues[0] = resource.IsCustom;
    newValues[1] = resource.UniqueId.ToString();
    newValues[5] = resource.PlacedLayerType;
    newValues[14] = resource.UOrder;
    newValues[15] = resource.VOrder;
    newValues[28] = resource.OriginalCompId;

    // This values should be changed in the PlLdResource (with the specified UniqueId) as well
    // and some of them must be in accord with the underlining smart object in the LinkDataSource
    resource.PageNumber = (int)newValues[2]; // 2;
    resource.TotalPages = (int)newValues[3]; // 3;
    resource.AntiAliasPolicy = (int)newValues[4]; // 0;
    resource.TransformMatrix = (double[])newValues[6];
    resource.Value = (double)newValues[7]; // 1.23456789;
    resource.Perspective = (double)newValues[8]; // 0.123456789;
    resource.PerspectiveOther = (double)newValues[9]; // 0.987654321;
    resource.Top = (double)newValues[10]; // -126;
    resource.Left = (double)newValues[11]; // -215;
    resource.Bottom = (double)newValues[12]; // 248;
    resource.Right = (double)newValues[13]; // 145;
    resource.Crop = (int)newValues[16]; // 5;
    resource.FrameStepNumerator = (int)newValues[17]; // 1;
    resource.FrameStepDenominator = (int)newValues[18]; // 601;
    resource.DurationNumerator = (int)newValues[19]; // 2;
    resource.DurationDenominator = (int)newValues[20]; // 602;
    resource.FrameCount = (int)newValues[21]; // 11;
    resource.Width = (double)newValues[22]; // 541;
    resource.Height = (double)newValues[23]; // 249;
    resource.Resolution = (double)newValues[24]; // 144;
    resource.ResolutionUnit = (UnitTypes)newValues[25];
    resource.Comp = (int)newValues[26]; // 21;
    resource.CompId = (int)newValues[27]; // 22;
    resource.NonAffineTransformMatrix = (double[])newValues[30];

    // This unique Id should be changed in references if any
    resource.PlacedId = new Guid((string)newValues[29]);  // "12345678-9abc-def0-9876-54321fecba98");
    if (resource.IsCustom)
    {
        resource.HorizontalMeshPointUnit = (UnitTypes)newValues[31];
        resource.HorizontalMeshPoints = (double[])newValues[32];
        resource.VerticalMeshPointUnit = (UnitTypes)newValues[33];
        resource.VerticalMeshPoints = (double[])newValues[34];
    }

    // Be careful with some parameters: the saved image may become unreadable by Adobe® Photoshop®
    ////resource.UOrder = 6;
    ////resource.VOrder = 9;

    // Do no change this otherwise you won't be able to use free transform
    // or change the underlining smart object to the vector type
    ////resource.PlacedLayerType = PlacedLayerType.Vector;

    // There should be valid PlLdResource with this unique Id
    ////resource.UniqueId = new Guid("98765432-10fe-cba0-1234-56789abcdef0");
}

object[] newSmartValues = new object[]
{
                true,
                null,
                2,
                3,
                0,
                PlacedLayerType.ImageStack,
                new double[8]
                {
                    12.937922786050663,
                    19.419959734187131,
                    2.85445817782261,
                    1.0540625423957124,
                    7.20861031651307,
                    14.634102808208553,
                    17.292074924741144,
                    4
                },
                1.23456789,
                0.123456789,
                0.987654321,
                -126d,
                -215d,
                248d,
                145d,
                4,
                4,
                5,
                1,
                601,
                2,
                602,
                11,
                541d,
                249d,
                144d,
                UnitTypes.Percent,
                21,
                22,
                23,
                "12345678-9abc-def0-9876-54321fecba98",
                new double[8]
                {
                    129.937922786050663,
                    195.419959734187131,
                    26.85445817782261,
                    12.0540625423957124,
                    72.20861031651307,
                    147.634102808208553,
                    175.292074924741144,
                    42
                },
                UnitTypes.Points,
                new double[16]
                {
                    0.01d, 103.33333333333433d, 206.66686666666666d, 310.02d,
                    0.20d, 103.33333333333533d, 206.69666666666666d, 310.03d,
                    30.06d, 103.33333333336333d, 206.66660666666666d, 310.04d,
                    04.05d, 103.33333333373333d, 206.66666166666666d, 310.05d
                },
                UnitTypes.Distance,
                new double[16]
                {
                    0.06d, 0.07d, 0.08d, 0.09d,
                    49.066666666666664d, 49.266666666666664d, 49.566666666666664d, 49.766666666666664d,
                    99.133333333333329d, 99.433333333333329d, 99.633333333333329d, 99.833333333333329d,
                    140, 141, 142, 143,
                },
};

object[] expectedValues = new object[]
{
                new object[]
                {
                    false,
                    "5867318f-3174-9f41-abca-22f56a75247e",
                    1,
                    1,
                    0x10,
                    PlacedLayerType.Raster,
                    new double[8]
                    {
                        0, 0, 2, 0, 2, 2, 0, 2
                    },
                    0d,
                    0d,
                    0d,
                    0d,
                    0d,
                    2d,
                    2d,
                    4,
                    4,
                    1,
                    0,
                    600,
                    0,
                    600,
                    1,
                    2d,
                    2d,
                    72d,
                    UnitTypes.Density,
                    -1,
                    -1,
                    -1,
                    "64b3997c-06e0-be40-a349-41acf397c897",
                    new double[8]
                    {
                        0, 0, 2, 0, 2, 2, 0, 2
                    },
                }
};

var sourceFilePath = "rgb8_2x2_linked.psd";
var outputPath = "rgb8_2x2_linked_output.psd";
using (PsdImage image = (PsdImage)Image.Load(sourceFilePath))
{
    SoLeResource soleResource = null;
    int index = 0;
    foreach (Layer imageLayer in image.Layers)
    {
        foreach (var imageResource in imageLayer.Resources)
        {
            var resource = imageResource as SoLeResource;
            if (resource != null)
            {
                soleResource = resource;
                var expectedValue = (object[])expectedValues[index++];
                AssertAreEqual(expectedValue[1], resource.UniqueId.ToString());
                CheckSmartObjectResourceValues(expectedValue, resource);
                SetNewSmartValues(resource, newSmartValues);

                break;
            }
        }
    }

    AssertIsTrue(soleResource != null);
    image.Save(outputPath, new PsdOptions(image));
    using (PsdImage savedImage = (PsdImage)Image.Load(outputPath))
    {
        foreach (Layer imageLayer in savedImage.Layers)
        {
            foreach (var imageResource in imageLayer.Resources)
            {
                var resource = imageResource as SoLeResource;
                if (resource != null)
                {
                    CheckSmartObjectResourceValues(newSmartValues, resource);

                    break;
                }
            }
        }
    }
}