ListItem Class

public sealed class ListItem

Public NotInheritable Class ListItem

using System;
using System.Text;
using SautinSoft.Document;
using SautinSoft.Document.CustomMarkups;
using SautinSoft.Document.Drawing;
using System.IO;

namespace Example
{
    class Program
    {
        static void Main(string[] args)
        {
            // Get your free 30-day key here:   
            // https://sautinsoft.com/start-for-free/

            InsertCombobox();
        }
        /// <summary>
        /// Inserting a Combo Box content control.
        /// </summary>
        /// <remarks>
        /// Details: https://www.sautinsoft.com/products/document/help/net/developer-guide/content-controls-insert-combobox-net-csharp-vb.php
        /// </remarks>

        static void InsertCombobox()
        {
            // Let's create a simple document.
            DocumentCore dc = new DocumentCore();

            // Create a Combo Box content control.
            InlineContentControl combobox = new InlineContentControl(dc, ContentControlType.ComboBox);
            dc.Sections.Add(new Section(dc, new Paragraph(dc, new Run(dc, "Combo Box "), combobox)));

            // Set common the content control properties.
            combobox.Properties.Title = "Combo Box";
            combobox.Properties.LockDeleting = true;
            combobox.Properties.CharacterFormat.FontColor = Color.Blue;

            // Add combox's list items.
            combobox.Properties.ListItems.Add(new ContentControlListItem("One", "1"));
            combobox.Properties.ListItems.Add(new ContentControlListItem("Two", "2"));
            combobox.Properties.ListItems.Add(new ContentControlListItem("Three", "3"));
            combobox.Properties.ListItems.Add(new ContentControlListItem("Four", "4"));

            // Set a default selected item.
            combobox.Properties.SelectedListItem = combobox.Properties.ListItems[2]; 

            // Save our document into DOCX format.
            string resultPath = @"result.docx";
            dc.Save(resultPath, new DocxSaveOptions());

            // Open the result for demonstration purposes.
            System.Diagnostics.Process.Start(new System.Diagnostics.ProcessStartInfo(resultPath) { UseShellExecute = true });
        }
    }
}

Imports System
Imports System.Text
Imports SautinSoft.Document
Imports SautinSoft.Document.CustomMarkups
Imports SautinSoft.Document.Drawing
Imports System.IO

Namespace Example
    Friend Class Program
        Shared Sub Main(ByVal args() As String)
            InsertCombobox()
        End Sub
                ''' Get your free 30-day key here:   
                ''' https://sautinsoft.com/start-for-free/
        ''' <summary>
        ''' Inserting a Combo Box content control.
        ''' </summary>
        ''' <remarks>
        ''' Details: https://www.sautinsoft.com/products/document/help/net/developer-guide/content-controls-insert-combobox-net-csharp-vb.php
        ''' </remarks>

        Private Shared Sub InsertCombobox()
            ' Let's create a simple document.
            Dim dc As New DocumentCore()

            ' Create a Combo Box content control.
            Dim combobox As New InlineContentControl(dc, ContentControlType.ComboBox)
            dc.Sections.Add(New Section(dc, New Paragraph(dc, New Run(dc, "Combo Box "), combobox)))

            ' Set common the content control properties.
            combobox.Properties.Title = "Combo Box"
            combobox.Properties.LockDeleting = True
            combobox.Properties.CharacterFormat.FontColor = Color.Blue

            ' Add combox's list items.
            combobox.Properties.ListItems.Add(New ContentControlListItem("One", "1"))
            combobox.Properties.ListItems.Add(New ContentControlListItem("Two", "2"))
            combobox.Properties.ListItems.Add(New ContentControlListItem("Three", "3"))
            combobox.Properties.ListItems.Add(New ContentControlListItem("Four", "4"))

            ' Set a default selected item.
            combobox.Properties.SelectedListItem = combobox.Properties.ListItems(2)

            ' Save our document into DOCX format.
            Dim resultPath As String = "result.docx"
            dc.Save(resultPath, New DocxSaveOptions())

            ' Open the result for demonstration purposes.
            System.Diagnostics.Process.Start(New System.Diagnostics.ProcessStartInfo(resultPath) With {.UseShellExecute = True})
        End Sub
    End Class
End Namespace