ArcMapAddinDistanceAndDirection.Models.FeatureClassUtils.PromptUserWithGxDialog C# (CSharp) Method

        public string PromptUserWithGxDialog(int iParentWindow)
        {
            //Prep the dialog
            if (m_ipSaveAsGxDialog == null)
            {
                m_ipSaveAsGxDialog = new GxDialog();
                IGxObjectFilterCollection ipGxObjFilterCol = (IGxObjectFilterCollection)m_ipSaveAsGxDialog;
                ipGxObjFilterCol.RemoveAllFilters();

                // Add the filters
                ipGxObjFilterCol.AddFilter(new GxFilterFGDBFeatureClasses(), false);
                ipGxObjFilterCol.AddFilter(new GxFilterShapefilesClass(), false);

                m_ipSaveAsGxDialog.AllowMultiSelect = false;
                m_ipSaveAsGxDialog.Title = "Select output";
                m_ipSaveAsGxDialog.ButtonCaption = "OK";
                m_ipSaveAsGxDialog.RememberLocation = true;
            }
            else
            {
                m_ipSaveAsGxDialog.Name = "";
                m_ipSaveAsGxDialog.FinalLocation.Refresh();
            }

            //Show the dialog and get the response
            if (m_ipSaveAsGxDialog.DoModalSave(iParentWindow) == false)
                return null;
            else
            {
                IGxObject ipGxObject = m_ipSaveAsGxDialog.FinalLocation;
                string nameString = m_ipSaveAsGxDialog.Name;
                bool replacingObject = m_ipSaveAsGxDialog.ReplacingObject;
                string path = m_ipSaveAsGxDialog.FinalLocation.FullName + "\\" + m_ipSaveAsGxDialog.Name;
                IGxObject ipSelectedObject = m_ipSaveAsGxDialog.InternalCatalog.SelectedObject;

                // user selected an existing featureclass
                if (ipSelectedObject != null && ipSelectedObject is IGxDataset)
                {
                    IGxDataset ipGxDataset = (IGxDataset)ipSelectedObject;
                    IDataset ipDataset = ipGxDataset.Dataset;

                    // User will be prompted if they select an existing shapefile
                    if ( ipDataset.Category.Equals("Shapefile Feature Class"))
                    {
                        return path;
                    }

                    while (DoesFeatureClassExist(ipDataset.Workspace.PathName, m_ipSaveAsGxDialog.Name))
                    {
                        if (System.Windows.Forms.MessageBox.Show("You've selected a feature class that already exists. Do you wish to replace it?", "Overwrite Feature Class", System.Windows.Forms.MessageBoxButtons.OKCancel) == System.Windows.Forms.DialogResult.OK)
                        {
                            return m_ipSaveAsGxDialog.FinalLocation.FullName + "\\" + m_ipSaveAsGxDialog.Name;
                        }

                        if (m_ipSaveAsGxDialog.DoModalSave(iParentWindow) == false)
                        {
                            return null;
                        }

                        if (ipSelectedObject != null && ipSelectedObject is IGxDataset)
                        {
                            ipGxDataset = (IGxDataset)ipSelectedObject;
                            ipDataset = ipGxDataset.Dataset;
                        }
                    }

                    return m_ipSaveAsGxDialog.FinalLocation.FullName + "\\" + m_ipSaveAsGxDialog.Name;
                }
                else
                    return path;
            }
        }