How to snap a point to a coordinate grid

private void SnapToSpatialReference(IFeatureClass featureClass)
{
    if (featureClass == null)
    {
        return ;
    }
    IGeoDataset geoDataset = featureClass as IGeoDataset;
    ISpatialReference spatialReference = geoDataset.SpatialReference;
    IPoint point = new PointClass();

    // The IPoint interface inherits from the IGeometry interface.
    point.SpatialReference = spatialReference;

    // Assign to the point the mathematical (i.e., full double precision resolution) center of 
    // the x,y domain of this spatial reference.
    double xMin;
    double yMin;
    double xMax;
    double yMax;
    spatialReference.GetDomain(out xMin, out xMax, out yMin, out yMax);

    point.X = (xMin + xMax) * 0.5;
    point.Y = (yMin + yMax) * 0.5;

    // Snap the double precision center of the domain to a location representable in the domain. 
    // Specifically, a multiple of the resolution and offset from the xMin, yMin of the domain.
    System.Windows.Forms.MessageBox.Show("Before snapping: " + point.X + ", " +
        point.Y);
    point.SnapToSpatialReference();
    System.Windows.Forms.MessageBox.Show("After snapping: " + point.X + ", " +
        point.Y);
}

Private Sub SnapToSpatialReference(ByVal featureClass As IFeatureClass)
    If featureClass Is Nothing Then
        Exit Sub
    End If
    Dim geoDataset As IGeoDataset = CType(featureClass, IGeoDataset)
    Dim spatialReference As ISpatialReference = geoDataset.SpatialReference
    Dim point As IPoint = New PointClass()
    
    ' The IPoint interface inherits from the IGeometry interface.
    point.SpatialReference = spatialReference
    
    ' Assign to the point the mathematical (i.e., full double precision resolution) center of
    ' the x,y domain of this spatial reference.
    Dim xMin As Double, yMin As Double, xMax As Double, yMax As Double
    spatialReference.GetDomain(xMin, xMax, yMin, yMax)
    point.X = (xMin + xMax) * 0.5
    point.Y = (yMin + yMax) * 0.5
    
    ' Snap the double precision center of the domain to a location representable in the domain.
    ' Specifically, a multiple of the resolution and offset from the xMin, yMin of the domain.
    System.Windows.Forms.MessageBox.Show("Before snapping: " & point.X & ", " & point.Y)
    point.SnapToSpatialReference()
    System.Windows.Forms.MessageBox.Show("After snapping: " & point.X & ", " & point.Y)
End Sub