The below code iterates all the corridors with the applied template drops. It generates a report in tabular format with information template name, start chainage, end chainage, and drop interval.

//Required References
using System;
using Bentley.GeometryNET;
using Bentley.CifNET.GeometryModel.SDK;
using System.Diagnostics;
using System.Collections.Generic;
using System.Linq;
using Bentley.DgnPlatformNET;
using Bentley.MstnPlatformNET;
using Bentley.DgnPlatformNET.Elements;
using Bentley.CifNET.LinearGeometry;
using Bentley.CifNET.Formatting;

 public void GenerateListOfAppliedTemplateInTabularFormat()
        {
            try
            {
                //Get active dgn, model and connection object
                DgnModel dgnModel = Session.Instance.GetActiveDgnModel();
                DgnFile dgnFile = dgnModel.GetDgnFile();
                Bentley.CifNET.SDK.Edit.ConsensusConnectionEdit con = Bentley.CifNET.SDK.Edit.ConsensusConnectionEdit.GetActive();
                GeometricModel geomModel = con.GetActiveGeometricModel();
                if (geomModel == null) return;

                int rowCount = 0;
                DPoint3d origin = new DPoint3d(0, 0, 0);

                //Calculate the row count for table and calculate point for table origin 
                foreach (Corridor corridor in geomModel.Corridors)
                {
                    if (rowCount == 0)
                    {
                        Alignment alignment = corridor.CorridorAlignment;
                        double length = alignment.LinearGeometry.Length / 2;

                        LinearPoint originPoint = alignment.LinearGeometry.GetPointAtDistanceOffset(length, 100);

                        //User need to convert this origin value to current units based on settings
                        double UorPerMeter = FormatSettingsConstants.GetUorPerMeter(Session.Instance.GetActiveDgnModel());
                        origin = new DPoint3d(originPoint.Coordinates.X * UorPerMeter, originPoint.Coordinates.Y * UorPerMeter, originPoint.Coordinates.Z * UorPerMeter);
                    }
                    rowCount += corridor.TemplateDrops.Count();
                }


                //Obtain DgnTextStyle to be applied to TextTable
                DgnTextStyle dgnTextStyle = GetTableTextStyle();
                BentleyStatus status = dgnTextStyle.GetProperty(TextStyleProperty.Height, out double textHeight);

                //set row and column count for table
                uint nRowCount = Convert.ToUInt32(rowCount);
                uint nColumnCount = 4;

                //Create TextTable Element and set it's Origin
                TextTable templateDropTextTable = TextTable.Create(nRowCount, nColumnCount, dgnTextStyle.Id, textHeight, dgnModel);
                templateDropTextTable.Origin = origin;

                //set rotation value for table
                DVector3d rotVector = new DVector3d(new DPoint3d(0, 0, 0));
                DMatrix3d rotMatrix = DMatrix3d.Rotation(2, rotVector.AngleXY);
                templateDropTextTable.Rotation = rotMatrix;

                uint nRowId = 0;
                //Iterate over the corridors and applied template drops and create text table cell with data to show 
                foreach (Corridor corridor in geomModel.Corridors)
                {
                    IEnumerable<TemplateDrop> templateDrops = corridor.TemplateDrops;
                    foreach (TemplateDrop templateDrop in templateDrops)
                    {
                        //Genrate data to fill into table
                        string templateName = templateDrop.Template.TemplatePath;
                        string startDistance = templateDrop.StartDistance.ToString();
                        string endDistance = templateDrop.EndDistance.ToString();
                        string dropInterval = templateDrop.Interval.ToString();

                        //Fill TextTableCell with respective TextBlock
                        uint nColumnId = 0;

                        TextBlock txtBlock = new TextBlock(dgnTextStyle, dgnModel);

                        TextTableCell textTableCell = templateDropTextTable.GetCell(new TableCellIndex(nRowId, nColumnId));
                        textTableCell.TextBlock = txtBlock;
                        TextBlock templateNameTextBlock = textTableCell.TextBlock;
                        templateNameTextBlock.AppendText(templateName);
                        textTableCell.TextBlock = templateNameTextBlock;
                        nColumnId++;

                        textTableCell = templateDropTextTable.GetCell(new TableCellIndex(nRowId, nColumnId));
                        textTableCell.TextBlock = txtBlock;
                        TextBlock startDistanceTextBlock = textTableCell.TextBlock;
                        startDistanceTextBlock.AppendText(startDistance);
                        textTableCell.TextBlock = startDistanceTextBlock;
                        nColumnId++;

                        textTableCell = templateDropTextTable.GetCell(new TableCellIndex(nRowId, nColumnId));
                        textTableCell.TextBlock = txtBlock;
                        TextBlock endDistanceTextBlock = textTableCell.TextBlock;
                        endDistanceTextBlock.AppendText(endDistance);
                        textTableCell.TextBlock = endDistanceTextBlock;
                        nColumnId++;

                        textTableCell = templateDropTextTable.GetCell(new TableCellIndex(nRowId, nColumnId));
                        textTableCell.TextBlock = txtBlock;
                        TextBlock dropIntervalTextBlock = textTableCell.TextBlock;
                        dropIntervalTextBlock.AppendText(dropInterval);
                        textTableCell.TextBlock = dropIntervalTextBlock;
                        nColumnId++;

                        txtBlock.Dispose();
                        nRowId++;
                    }
                }

                //Set TextTableColumn Width from its contents 
                for (uint i = 0; i < nColumnCount; ++i)
                {
                    TextTableColumn textTableColumn = templateDropTextTable.GetColumn(i);
                    textTableColumn.SetWidthFromContents();
                }

                //Color and LineStyle are applied as per active attributes      
                int color = Settings.Color;
                int lineStyle = Settings.LineStyle;
                int lineWeight = Settings.LineWeight;
                templateDropTextTable.DefaultLineColor = (uint)color;
                templateDropTextTable.DefaultLineStyle = lineStyle;
                templateDropTextTable.DefaultLineWeight = (uint)lineWeight;

                //Create TextTableElement and add to model
                TextTableElement curveTextTableElement = new TextTableElement(templateDropTextTable, dgnModel);
                ElementPropertiesSetter elementPropertiesSetter = new ElementPropertiesSetter();
                elementPropertiesSetter.Apply(curveTextTableElement);

                curveTextTableElement.AddToModel();
            }
            catch (Exception ex)
            {
                Trace.WriteLine(ex.Message);
            }
        }

        //Set active textstyle
        protected DgnTextStyle GetTableTextStyle()
        {
            DgnTextStyle textStyle = null;
            string activeTextStyleName = "";
            try
            {
                DgnModel dgnModel = Session.Instance.GetActiveDgnModel();
                DgnFile dgnFile = dgnModel.GetDgnFile();

                double dWidth = 0.00050;
                double dHeight = 0.00050;
                double dLineSpacing = 0.70;
                string fontName = "Engineering Regular";

                activeTextStyleName = "LM_Text";

                Settings.TextWidth = dWidth;
                Settings.TextHeight = dHeight;
                Settings.LineSpacing = dLineSpacing;
                Settings.Font = fontName;
                Settings.TextStyleName = activeTextStyleName;
                Settings.TextJustification = TextElementJustification.CenterMiddle;

                textStyle = new DgnTextStyle(activeTextStyleName, dgnFile);
                DgnFont dgnFont = dgnFile.GetDgnFontMap().FindFontByName(out uint foundNum, fontName, DgnFontFilterFlags.All);
                textStyle.SetFontProperty(TextStyleProperty.Font, dgnFont);
                textStyle.SetProperty(TextStyleProperty.Height, dHeight);
                textStyle.SetProperty(TextStyleProperty.Width, dWidth);
                textStyle.SetProperty(TextStyleProperty.LineSpacing, dLineSpacing);

                textStyle.Add(dgnFile);
                dgnModel.SaveModelSettings();
                textStyle = DgnTextStyle.GetSettings(dgnFile);

                Session.Instance.Keyin("textstyle active " + activeTextStyleName);
            }
            catch (Exception ex)
            {
                Trace.WriteLine(ex.Message);
            }
            return textStyle;
        }

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Output