/// <summary>
        /// create pipe
        /// </summary>
        /// <param name="crystParams">parameters of the crystal</param>
        /// <param name="inputFile">name of file with input crystal</param>
        /// <param name="axis">axis and direction of rotation</param>
        public void CreatePipe(CrystalParameters crystParams, string inputFile, string axis)
        {
            CylinderParameters pipeParams = GetPipeParametres();

            if (Equals(pipeParams, null))
            {
                ShowError("Invalid values of pipe parametres.");
                return;
            }
            try
            {
                Program.CreatePipe(crystParams, pipeParams, inputFile, axis);
                ActionWasSuccessfull("Pipe was created.");
            }
            catch
            {
                ShowError("Invalid input file with crystal atom's coordinates.");
            }
        }
        /// <summary>
        /// Load pipe parameters from input textboxes and verify they are correct
        /// </summary>
        /// <returns>pipe parameters</returns>
        public CylinderParameters GetPipeParametres()
        {
            double depth = Convert.ToDouble(textBoxLength.Text);

            if (areParametersPhysical)
            {
                double innerSize = Convert.ToDouble(textBoxInnerDiameter.Text, CultureInfo.InvariantCulture);
                double outerSize = Convert.ToDouble(textBoxOuterDiameter.Text, CultureInfo.InvariantCulture);
                double circ      = ConvertorOfParametres.CircumferenceOfTheCircle(innerSize, outerSize); //count circumference of a circle
                double height    = (outerSize - innerSize) / 2;
                return(new CylinderParameters(depth, circ, height));
            }
            double             circumference = Convert.ToDouble(textBoxInnerDiameter.Text, CultureInfo.InvariantCulture);
            double             wallWidth1    = Convert.ToDouble(textBoxOuterDiameter.Text, CultureInfo.InvariantCulture);
            CylinderParameters pp            = new CylinderParameters(depth, circumference, wallWidth1);

            if (!Validator.ValidPipe(pp))
            {
                return(null);
            }
            return(pp);
        }