Spire.Doc for .NET主要用于开发人员进行word文档操作和处理，主要进行word文档的创建、打开、和保存，邮件的合并，安全、格式化以及和其他多种文档之间的转换等，支持word文档从97-2013版本，并且可以用于.NET/WPF和silverlight平台下。

要实现多个文档的合并，在该产品中只需要几句代码即可实现，首先要对合并的单个文档进行初始化，然后得到文档的片段，然后使用控件提供的Document.Sections.Add在指定的片段后加入要合并的文档即可，具体代码如下：

[C#]

using Spire.Doc;

namespace MergeDocument
{
    class DocxMerge
    {
        static void Main(string[] args)
        {
            //Load Document1 and Document2
            Document DocOne = new Document();
            DocOne.LoadFromFile(@"E:\Work\Document\welcome.docx", FileFormat.Docx);
            Document DocTwo = new Document();
            DocTwo.LoadFromFile(@"E:\Work\Document\New Zealand.docx", FileFormat.Docx);

            //Merge
            foreach (Section sec in DocTwo.Sections)
            {
                DocOne.Sections.Add(sec.Clone());
            }

            //Save and Launch
            DocOne.SaveToFile("Merge.docx", FileFormat.Docx);
            System.Diagnostics.Process.Start("Merge.docx");
        }
    }
}

[VB.NET]
Imports Spire.Doc

Namespace MergeDocument
    Friend Class DocxMerge
        Shared Sub Main(ByVal args() As String)
            'Load Document1 and Document2
            Dim DocOne As New Document()
            DocOne.LoadFromFile("E:\Work\Document\welcome.docx", FileFormat.Docx)
            Dim DocTwo As New Document()
            DocTwo.LoadFromFile("E:\Work\Document\New Zealand.docx", FileFormat.Docx)

            'Merge
            For Each sec As Section In DocTwo.Sections
                DocOne.Sections.Add(sec.Clone())
            Next sec

            'Save and Launch
            DocOne.SaveToFile("Merge.docx", FileFormat.Docx)
            System.Diagnostics.Process.Start("Merge.docx")
        End Sub
    End Class
End Namespace