NumberStyle

public NumberStyle NumberStyle { get; set; }

Document doc = new Document();

// A list allows us to organize and decorate sets of paragraphs with prefix symbols and indents.
// We can create nested lists by increasing the indent level. 
// We can begin and end a list by using a document builder's "ListFormat" property. 
// Each paragraph that we add between a list's start and the end will become an item in the list.
// Create a list from a Microsoft Word template, and customize the first two of its list levels.
List list = doc.Lists.Add(ListTemplate.NumberDefault);

ListLevel listLevel = list.ListLevels[0];
listLevel.Font.Color = Color.Red;
listLevel.Font.Size = 24;
listLevel.NumberStyle = NumberStyle.OrdinalText;
listLevel.StartAt = 21;
listLevel.NumberFormat = "\x0000";

listLevel.NumberPosition = -36;
listLevel.TextPosition = 144;
listLevel.TabPosition = 144;

listLevel = list.ListLevels[1];
listLevel.Alignment = ListLevelAlignment.Right;
listLevel.NumberStyle = NumberStyle.Bullet;
listLevel.Font.Name = "Wingdings";
listLevel.Font.Color = Color.Blue;
listLevel.Font.Size = 24;

// This NumberFormat value will create star-shaped bullet list symbols.
listLevel.NumberFormat = "\xf0af";
listLevel.TrailingCharacter = ListTrailingCharacter.Space;
listLevel.NumberPosition = 144;

// Create paragraphs and apply both list levels of our custom list formatting to them.
DocumentBuilder builder = new DocumentBuilder(doc);

builder.ListFormat.List = list;
builder.Writeln("The quick brown fox...");
builder.Writeln("The quick brown fox...");

builder.ListFormat.ListIndent();
builder.Writeln("jumped over the lazy dog.");
builder.Writeln("jumped over the lazy dog.");

builder.ListFormat.ListOutdent();
builder.Writeln("The quick brown fox...");

builder.ListFormat.RemoveNumbers();

builder.Document.Save(ArtifactsDir + "Lists.CreateCustomList.docx");

Document doc = new Document();
DocumentBuilder builder = new DocumentBuilder(doc);

// A list allows us to organize and decorate sets of paragraphs with prefix symbols and indents.
// We can create nested lists by increasing the indent level. 
// We can begin and end a list by using a document builder's "ListFormat" property. 
// Each paragraph that we add between a list's start and the end will become an item in the list.
List list = doc.Lists.Add(ListTemplate.NumberDefault);

// Level 1 labels will be formatted according to the "Heading 1" paragraph style and will have a prefix.
// These will look like "Appendix A", "Appendix B"...
list.ListLevels[0].NumberFormat = "Appendix \x0000";
list.ListLevels[0].NumberStyle = NumberStyle.UppercaseLetter;
list.ListLevels[0].LinkedStyle = doc.Styles["Heading 1"];

// Level 2 labels will display the current numbers of the first and the second list levels and have leading zeroes.
// If the first list level is at 1, then the list labels from these will look like "Section (1.01)", "Section (1.02)"...
list.ListLevels[1].NumberFormat = "Section (\x0000.\x0001)";
list.ListLevels[1].NumberStyle = NumberStyle.LeadingZero;

// Note that the higher-level uses UppercaseLetter numbering.
// We can set the "IsLegal" property to use Arabic numbers for the higher list levels.
list.ListLevels[1].IsLegal = true;
list.ListLevels[1].RestartAfterLevel = 0;

// Level 3 labels will be upper case Roman numerals with a prefix and a suffix and will restart at each List level 1 item.
// These list labels will look like "-I-", "-II-"...
list.ListLevels[2].NumberFormat = "-\x0002-";
list.ListLevels[2].NumberStyle = NumberStyle.UppercaseRoman;
list.ListLevels[2].RestartAfterLevel = 1;

// Make labels of all list levels bold.
foreach (ListLevel level in list.ListLevels)
    level.Font.Bold = true;

// Apply list formatting to the current paragraph.
builder.ListFormat.List = list;

// Create list items that will display all three of our list levels.
for (int n = 0; n < 2; n++)
{
    for (int i = 0; i < 3; i++)
    {
        builder.ListFormat.ListLevelNumber = i;
        builder.Writeln("Level " + i);
    }
}

builder.ListFormat.RemoveNumbers();

doc.Save(ArtifactsDir + "Lists.CreateListRestartAfterHigher.docx");