Azavea.NijPredictivePolicing.AcsAlchemistGui.MainForm.txtFishnetCellSize_Validating C# (CSharp) Method

        private void txtFishnetCellSize_Validating(object sender, CancelEventArgs e)
        {
            //check to see if it parses nicely
            string errorMessage = string.Empty;

            string cellSize = txtFishnetCellSize.Text.Trim();
            if (!string.IsNullOrEmpty(cellSize))
            {
                var chunks = cellSize.Split("x_:, ".ToCharArray(), StringSplitOptions.RemoveEmptyEntries);

                //1 param, square
                if ((chunks.Length == 1)
                    && ((Utilities.GetAs<double>(chunks[0], -1)) == -1))
                {
                    errorMessage = "Invalid size";
                }
                //2 params, rectangle
                else if ((chunks.Length == 2)
                    && (((Utilities.GetAs<double>(chunks[0], -1)) == -1)
                        || ((Utilities.GetAs<double>(chunks[1], -1)) == -1)))
                {
                    errorMessage = "Invalid width/height";
                }
            }

            this.errorProvider1.SetError(txtFishnetCellSize, errorMessage);
        }