This demo reads customer data from a database and creates standard-sized 5160 mailing labels.  Put some label paper into your printer and see for yourself!

    public void GenerateDocument()
        {
           
            // Get the addresses from a datasource and return them as properly formatted addresses
            string[] AddressArray = GetCustomerAddressStrings();
 
            // Create a DataTable with one column for each
             // label across
            
            DataTable AddressTable = new DataTable();
            AddressTable.Columns.Add("Address1");
            AddressTable.Columns.Add("Address2");
            AddressTable.Columns.Add("Address3");
 
            string[] Row = new string[AddressTable.Columns.Count];
 
            int addridx = 0;
            // Set an infinite loop, break is called inside
            while (addridx < AddressArray.Length)
            {
                // Loop once for every Template column
                for (int i = 0; i < Row.Length; i++)
                {
                    // If there's a value left in mAddressValues, use it
                     // Otherwise, fill an empty string
                    
                    if (addridx < AddressArray.Length)
                        Row[i] = AddressArray[addridx];
                    else
                        Row[i] = String.Empty;
 
                    addridx++;
                }
 
                // Add the data row after all columns are filled
                AddressTable.Rows.Add(Row);
            }
 
 
            // Create an instance of WordTemplate
            WordTemplate wt = new WordTemplate();
 
            // Open the template document
            string templatePath = @"..\..\WordTemplateFiles\MailLabelTemplate.docx";
            wt.Open(templatePath);
 
            // Set the LabelRow repeat block with the AddressTable table
            wt.SetRepeatBlock(AddressTable, "LabelRow");
 
            // Process the template to populate the values
            wt.Process();
 
            // Save the document
 
            wt.Save(@"..\..\WordOutputFiles\MailLabels_output.docx");
        }



        //Create a datatable with all then customer information and return it
        private DataTable GetCustomersData(){
            DataTable dt = new DataTable();
            dt.Columns.Add("ContactName");
            dt.Columns.Add("Address");
            dt.Columns.Add("City");
            dt.Columns.Add("Region");
            dt.Columns.Add("PostalCode");
            dt.Columns.Add("Country");

            dt.Rows.Add(new Object[] { "Incomparable Bicycle Store", "99 Edgewater Drive", "Norwood",
                "MA", "2062", "United States" });
            dt.Rows.Add(new Object[] { "Wholesale Bikes", "58 Teed Drive", "Randolph",
                "MA", "2368", "United States" });
            dt.Rows.Add(new Object[] { "Bikes Anyone?", "Ames Plaza", "Saugus",
                "MA", "1906", "United States" });
            dt.Rows.Add(new Object[] { "Purchase Mart", "Wrentham Village", "Wrentham",
                "MA", "2093", "United States" });
            return dt;
}

        // Get the address items from the DataTable, format
        // them, and return them in a string array

        private string[] GetCustomerAddressStrings()
        {
            // Get the DataTables with the customer information
            DataTable dt = GetCustomersData();
            /* this is the format string for an address */
            string FormatTemplate = "{0}\n" +            // Name
                "{1}\n" +            // Street
                "{2}, {3} {4}\n" +    // City, State Zip
                "{5}";                // Country

            ArrayList al = new ArrayList();

            // Copy the DataTable row values into strings
            // and put them in an ArrayList

            foreach (DataRow dr in dt.Rows)
            {
                string address = String.Format(FormatTemplate,
                    dr["ContactName"], dr["Address"],
                    dr["City"], dr["Region"], dr["PostalCode"], dr["Country"]);

                al.Add(address);
            }

            // Return the values as a string array (string[])
            return (string[])al.ToArray(typeof(string));
        }

 Template: MailLabelTemplate.docx

Output: MailLabels_output.docx