public void GetInfo_BoundaryConditions(BoundaryConditions boundaryConditions)
{
    string message = "BoundaryConditions : ";

    boundaryConditions.GetBoundaryConditionsType();
    switch (boundaryConditions.GetBoundaryConditionsType())
    {
        case BoundaryConditionsType.Point:
            XYZ point = boundaryConditions.Point;
            message += "\nThis BoundaryConditions is a Point Boundary Conditions.";
            message += "\nLocation point: (" + point.X + ", "
                        + point.Y + ", " + point.Z + ")";
            break;
        case BoundaryConditionsType.Line:
            message += "\nThis BoundaryConditions is a Line Boundary Conditions.";
            Curve curve = boundaryConditions.GetCurve();
            // Get curve start point
            message += "\nLocation Line: start point: (" + curve.GetEndPoint(0).X + ", "
                    + curve.GetEndPoint(0).Y + ", " + curve.GetEndPoint(0).Z + ")";
            // Get curve end point
            message += ";  end point:(" + curve.GetEndPoint(1).X + ", "
                    + curve.GetEndPoint(1).Y + ", " + curve.GetEndPoint(1).Z + ")";
            break;
        case BoundaryConditionsType.Area:
            message += "\nThis BoundaryConditions is an Area Boundary Conditions.";
            IList<CurveLoop> loops = boundaryConditions.GetLoops();
            foreach (CurveLoop curveLoop in loops)
            {
                foreach (Curve areaCurve in curveLoop)
                {
                    // Get curve start point
                    message += "\nCurve start point:(" + areaCurve.GetEndPoint(0).X + ", "
                            + areaCurve.GetEndPoint(0).Y + ", " + areaCurve.GetEndPoint(0).Z + ")";
                    // Get curve end point
                    message += "; Curve end point:(" + areaCurve.GetEndPoint(1).X + ", "
                            + areaCurve.GetEndPoint(1).Y + ", " + areaCurve.GetEndPoint(1).Z + ")";
                }
            }
            break;
        default:
            break;
    }

    TaskDialog.Show("Revit",message);
}

Public Sub GetInfo_BoundaryConditions(boundaryConditions As BoundaryConditions)
    Dim message As String = "BoundaryConditions : "

    boundaryConditions.GetBoundaryConditionsType()
    Select Case boundaryConditions.GetBoundaryConditionsType()
        Case BoundaryConditionsType.Point
            Dim point As XYZ = boundaryConditions.Point
            message += vbLf & "This BoundaryConditions is a Point Boundary Conditions."
            message += vbLf & "Location point: (" + point.X + ", " + point.Y + ", " + point.Z + ")"
            Exit Select
        Case BoundaryConditionsType.Line
            message += vbLf & "This BoundaryConditions is a Line Boundary Conditions."
            Dim curve As Curve = boundaryConditions.GetCurve()
            ' Get curve start point
            message += vbLf & "Location Line: start point: (" + curve.GetEndPoint(0).X + ", " + curve.GetEndPoint(0).Y + ", " + curve.GetEndPoint(0).Z + ")"
            ' Get curve end point
            message += ";  end point:(" + curve.GetEndPoint(1).X + ", " + curve.GetEndPoint(1).Y + ", " + curve.GetEndPoint(1).Z + ")"
            Exit Select
        Case BoundaryConditionsType.Area
            message += vbLf & "This BoundaryConditions is an Area Boundary Conditions."
            Dim loops As IList(Of CurveLoop) = boundaryConditions.GetLoops()
            For Each curveLoop As CurveLoop In loops
                For Each areaCurve As Curve In curveLoop
                    ' Get curve start point
                    message += vbLf & "Curve start point:(" + areaCurve.GetEndPoint(0).X + ", " + areaCurve.GetEndPoint(0).Y + ", " + areaCurve.GetEndPoint(0).Z + ")"
                    ' Get curve end point
                    message += "; Curve end point:(" + areaCurve.GetEndPoint(1).X + ", " + areaCurve.GetEndPoint(1).Y + ", " + areaCurve.GetEndPoint(1).Z + ")"
                Next
            Next
            Exit Select
        Case Else
            Exit Select
    End Select

    TaskDialog.Show("Revit", message)
End Sub