PM> Install-Package Spire.Doc

using Spire.Doc;
using Spire.Doc.Documents;
using Spire.Doc.Fields;
using System.Drawing;

namespace CreateWordByReplacingTextPlaceholders
{
    class Program
    {
        static void Main(string[] args)
        {
            // Initialize a new Document object
            Document document = new Document();

            // Load the template Word file
            document.LoadFromFile("C:\\Users\\Administrator\\Desktop\\Template.docx");

            // Dictionary to hold text placeholders and their replacements
            Dictionary<string, string> replaceDict = new Dictionary<string, string>
            {
                { "#name#", "John Doe" },
                { "#gender#", "Male" },
                { "#birthdate#", "January 15, 1990" },
                { "#address#", "123 Main Street" },
                { "#city#", "Springfield" },
                { "#state#", "Illinois" },
                { "#postal#", "62701" },
                { "#country#", "United States" }
            };

            // Replace placeholders in the document with corresponding values
            foreach (KeyValuePair<string, string> kvp in replaceDict)
            {
                document.Replace(kvp.Key, kvp.Value, true, true);
            }

            // Path to the image file
            String imagePath = "C:\\Users\\Administrator\\Desktop\\portrait.png";

            // Replace the placeholder “#photo#” with an image
            ReplaceTextWithImage(document, "#photo#", imagePath);

            // Save the modified document
            document.SaveToFile("ReplacePlaceholders.docx", FileFormat.Docx);

            // Release resources
            document.Dispose();
        }

        // Method to replace a placeholder in the document with an image
        static void ReplaceTextWithImage(Document document, String stringToReplace, String imagePath)
        {
            // Load the image from the specified path
            Image image = Image.FromFile(imagePath);
            DocPicture pic = new DocPicture(document);
            pic.LoadImage(image);

            // Find the placeholder in the document
            TextSelection selection = document.FindString(stringToReplace, false, true);

            // Get the range of the found text
            TextRange range = selection.GetAsOneRange();
            int index = range.OwnerParagraph.ChildObjects.IndexOf(range);

            // Insert the image and remove the placeholder text
            range.OwnerParagraph.ChildObjects.Insert(index, pic);
            range.OwnerParagraph.ChildObjects.Remove(range);
        }
    }
}

using Spire.Doc;
using Spire.Doc.Documents;

namespace CreateWordByReplacingBookmarkContent
{
    class Program
    {
        static void Main(string[] args)
        {
            // Initialize a new Document object
            Document document = new Document();

            // Load the template Word file
            document.LoadFromFile("C:\\Users\\Administrator\\Desktop\\Template.docx");

            // Define bookmark names and their replacement values
            Dictionary<string, string> replaceDict = new Dictionary<string, string>
            {
                { "name", "Tech Innovations Inc." },
                { "year", "2015" },
                { "headquarter", "San Francisco, California, USA" },
                { "history", "Tech Innovations Inc. was founded by a group of engineers and " +
                              "entrepreneurs with a vision to revolutionize the technology sector. Starting " +
                              "with a focus on software development, the company expanded its portfolio to " +
                              "include artificial intelligence and cloud computing solutions." }
            };

            // Create a BookmarksNavigator to manage bookmarks in the document
            BookmarksNavigator bookmarkNavigator = new BookmarksNavigator(document);

            // Replace each bookmark's content with the corresponding value
            foreach (KeyValuePair<string, string> kvp in replaceDict)
            {
                bookmarkNavigator.MoveToBookmark(kvp.Key); // Navigate to bookmark
                bookmarkNavigator.ReplaceBookmarkContent(kvp.Value, true); // Replace content
            }

            // Save the modified document
            document.SaveToFile("ReplaceBookmarkContent.docx", FileFormat.Docx2013);

            // Release resources
            document.Dispose();
        }
    }
}