How to modify the formatting for the default format of sections, paragraphs, and tables in a Word document?

Syncfusion Essential DocIO is a .NET Core Word Library used to create, read, edit, and convert Word documents programmatically without Microsoft Word or interop dependencies. Using this library, you can modify the formatting for the default format of paragraphs, sections, and tables in a Word document using C#.

Steps to modify default formats in Word document

1. Create a new C# Console application project.
2. Install the Syncfusion.DocIO.Net.Core NuGet package as a reference to your project from Nuget.org.
   

3. Include the following namespace in the Program.cs file​.
   C#

using Syncfusion.DocIO;
using Syncfusion.DocIO.DLS;

4. Include the below code snippet to modify the formatting for default style in a Word document.
   C#

using (FileStream fileStreamPath = new FileStream(@"Input.docx", FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
{
   //Open the existing Word document.
   using (WordDocument document = new WordDocument(fileStreamPath, FormatType.Docx))
   {
       //Change section formatting
       ChangeSectionFormatting(document);
       //Change paragraph style formatting
       ChangeParagraphFormatting(document);
       //Change table style formatting
       ChangeTableFormatting(document);
       using (FileStream outputStream = new FileStream(@"Output.docx", FileMode.Create, FileAccess.ReadWrite, FileShare.ReadWrite))
       {
           //Save the Word document.
           document.Save(outputStream, FormatType.Docx);
       }
   }
} 

5. Use the following method to modify the section formatting.
   C#

void ChangeSectionFormatting(WordDocument document)
{
   //Iterate each section.
   for (int i = 0; i < document.Sections.Count; i++)
   {
       //Set the Orientation.
       document.Sections[i].PageSetup.Orientation = PageOrientation.Landscape;
       //Set the top margin.
       document.Sections[i].PageSetup.Margins.Top = 100;
   }
}

6. Word document uses “Normal” paragraph style as default for all paragraphs. Use the following method to modify the formatting for default paragraph style.
   C#

void ChangeParagraphFormatting(WordDocument document)
{
   //Get the default paragraph style.
   WParagraphStyle paraStyle = document.Styles.FindByName("Normal") as WParagraphStyle;
   //Set character format.
   paraStyle.CharacterFormat.FontName = "Arial";
   paraStyle.CharacterFormat.FontSize = 14;
   //Set paragraph format.
   paraStyle.ParagraphFormat.AfterSpacing = 20;
}

7. Word document uses “Table Grid” table style as default for all tables. Use the following method to modify the formatting for default table style.
   C#

void ChangeTableFormatting(WordDocument document)
{
   //Get the default table style.
   WTableStyle tableStyle = document.Styles.FindByName("Table Grid") as WTableStyle;
   //Set cell spacing to the table.
   tableStyle.TableProperties.CellSpacing = 5;
   //Applied BackColor to the table.
   tableStyle.TableProperties.BackColor = Syncfusion.Drawing.Color.Blue;
}

A complete working sample to modify the default formats in a Word document can be downloaded from GitHub.

By executing the program, you will get the Word document as follows.

Take a moment to peruse the [documentation](https where you can find basic Word document processing options along with the features like mail merge, merge, split, and compare documents, find and replace text in the Word document, protect the Word documents, and most importantly, the PDF and Image conversions with code examples.

Conclusion
I hope you enjoyed learning about how to modify the formatting for default styles in a Word document using .NET Core Word Library.

You can refer to our ASP.NET Core DocIO feature tour page to know about its other groundbreaking feature representations and documentation, and how to quickly get started for configuration specifications. You can also explore our ASP.NET Core DocIO example to understand how to create and manipulate data.

For current customers, you can check out our components from the License and Downloads page. If you are new to Syncfusion, you can try our 30-day free trial to check out our other controls.

If you have any queries or require clarifications, please let us know in the comments section below. You can also contact us through our support forums, Direct-Trac, or feedback portal. We are always happy to assist you!