After Click on Add reference then following window will be appear and select Microsoft Word 12.0 Object Library dll and click ok.

Step 3: After the Successfully added dll in your project write the following code to create MS-Word Document.

Here I am making a window form which perform two task first one is create ms-word document and second one is read document. 

Step 4: Now debug the code and click on the create button after clicking create button the create button click event generate

public partial class Form1 : Form
    {
         // create MS-Word application  
         Microsoft.Office.Interop.Word.ApplicationmsWord=new Microsoft.Office.Interop.Word.Application();
         // create Word document reference
         Microsoft.Office.Interop.Word.Documentdoc;
         // Create misssing value object 
         objectobjMiss=System.Reflection.Missing.Value;
         // Create end of document object
         objectendofdoc="\\endofdoc";
         publicForm1()
         {
            InitializeComponent();
         }
         /// <summary>
         ///This Method create first paragraph  
         /// </summary>
         public voidFirstPara()
         {
             // create first paragraph with reference name
            Microsoft.Office.Interop.Word.Paragraphpara1;
            // add paragraph with document 
            para1=doc.Content.Paragraphs.Add(refobjMiss);
            // create object of heading style 
            objectstyleHeading1="Heading 1";
            //add heading style with paragraph
            para1.Range.set_Style(refstyleHeading1);
            // Write text of paragraph 
            para1.Range.Text= "Hello Arun, How are You?";
            //set font style of paragraph 
            para1.Range.Font.Bold=1;
            // set space after write format of paragraph 
            para1.Format.SpaceAfter=24;
            // selection range of after insert paragraph 
            para1.Range.InsertParagraphAfter();
         }
        ///<summary>
        ///This Method Create Second Paragraph
        ///</summary>
        publicvoidSecondPara()
         {
            // create second paragaraph  with paragraph reference name para2
            Microsoft.Office.Interop.Word.Paragraphpara2;
  
            // add second paragraph with documnet
            para2=doc.Content.Paragraphs.Add(refobjMiss);
            // set paragraph heading style 
            objectstyleHeading2="Heading 2";
            // add heading style with paragraph
            para2.Range.set_Style(refstyleHeading2);
            // second paragraph text  
            para2.Range.Text= "Hii This is Arun I am fine and you?";
            // set second paragraph font style 
            para2.Range.Font.Bold=1;
            // space or font size style like 24pt, 25pt etc.
            para2.Format.SpaceAfter=24;
            // set selection range of paragraph 
            para2.Range.InsertParagraphAfter();
         }
        ///<summary>
        ///This Method create table in ms-word document
        ///</summary>
        publicvoidCreateTable(intRow,  intcolumn)
         {
  
            // create table in word documnet in word application with table reference name tbl1
            Microsoft.Office.Interop.Word.Tabletbl1;
            // calculate the range of endofdocu
            Microsoft.Office.Interop.Word.RangewordRange=doc.Bookmarks.get_Item(refendofdoc).Range;
            // add table with document with number of row and column
            tbl1=doc.Content.Tables.Add(wordRange, 3, 3, refobjMiss, refobjMiss);
            // set border visibility true by input 1 and false by input 0
            tbl1.Borders.Enable=1;
            // set text in each cell of table 
            for (intr=1; r<=3; r++)
            {
                 for (intc=1; c<=3; c++)
                {
                    tbl1.Cell(r, c).Range.Text="r"+r+"c"+c;
                }
            }
         }
  
///<summary>
///This method creates ms-word document and adding some paragraph, table and much more.
///</summary>
  
        publicvoidCreateMsWord()
         {
            try
            {
               // show ms-word application
                 msWord.Visible=true;
                // add blank documnet in word application
                doc =msWord.Documents.Add(ref objMiss, refobjMiss, refobjMiss, refobjMiss);
                // create first para 
                FirstPara();
                // create Second para
                SecondPara();
                // create table
                CreateTable(3, 3);
  
            }
            catch (Exceptionex) { MessageBox.Show(ex.ToString()); }
           
         }
  
        ///<summary>
        ///create button click event  
        ///</summary>
        privatevoid btn_Create_Click(objectsender, EventArgse)
         {
            // call the method to create ms word document file
            CreateMsWord();
         }

Desired Output:

When you click on Create button then following ms-word document file created.