Example

To create or edit MS Word document, first of all we need to add two references to our project.

Coding

 privatevoid btnCreate_Click(object sender, EventArgs e)
        {
            try
            {
//creating object for missing value
                object missing = System.Reflection.Missing.Value;
//object for end of file
                object endofdoc = "\\endofdoc";
 
//creating instance of word application
Microsoft.Office.Interop.Word._Application w = new Microsoft.Office.Interop.Word.Application();
//creating instance of word document
                Microsoft.Office.Interop.Word._Document doc;
//setting status of application to visible
                w.Visible = true;
//creating new document
    doc = w.Documents.Add(ref missing, ref missing, ref missing,     ref missing);
//adding paragraph to document
                Microsoft.Office.Interop.Word.Paragraph para1;
                para1 = doc.Content.Paragraphs.Add(ref missing);
                object styleHeading1 = "Heading 1";
                para1.Range.set_Style(ref styleHeading1);
                para1.Range.Text = "Heading One";
                para1.Range.Font.Bold = 1;
                para1.Format.SpaceAfter = 24;
                para1.Range.InsertParagraphAfter();
//creating second paragraph 
                Microsoft.Office.Interop.Word.Paragraph para2;
                para2 = doc.Content.Paragraphs.Add(ref missing);                
    para2.Range.Text = "Heading OneHeading OneHeading OneHeading OneHeading OneHeading OneHeading"+ '\n'+"OneHeading OneHeading OneHeading OneHeading OneHeading OneHeading One";
                para2.Range.Font.Bold = 1;
                para2.Format.SpaceAfter = 24;
                para2.Range.InsertParagraphAfter(); 
            }
            catch (Exception ex)
            {
                 MessageBox.Show(ex.Message);
            }
        }

        privatevoid btnEdit_Click(object sender, EventArgs e)
        { 
//creating instance of word application
     Microsoft.Office.Interop.Word._Application w = new Microsoft.Office.Interop.Word.Application();                
                object path = @"C:\table.doc";
                object read = "ReadWrite";
                object readOnly = false;
                object o = System.Reflection.Missing.Value;
//opening document
    Microsoft.Office.Interop.Word._Document oDoc = w.Documents.Open(ref path, ref o, ref readOnly, ref o, ref o, ref o, ref o, ref o, ref o, ref o, ref o, ref o, ref o, ref o, ref o, ref o);
 
                try
                {               
//loop for each paragraph in document
foreach (Microsoft.Office.Interop.Word.Paragraph p in oDoc.Paragraphs)
                {
                    Microsoft.Office.Interop.Word.Range rng = p.Range;
  Microsoft.Office.Interop.Word.Style styl = rng.get_Style() as Microsoft.Office.Interop.Word.Style;                    
//checking if document containg table
if ((bool)rng.get_Information (Microsoft.Office.Interop.Word.WdInformation.wdWithInTable)
                    == true)
                    {
//loop for each cell in table
   foreach (Microsoft.Office.Interop.Word.Cell c in rng.Cells)
                        {
                            if (rng.Cells.Count > 0)
                            {
            //checking for desired field in table
                                if (c.Range.Text.ToString().Contains("ID"))
                  //editing values in tables.
                                    c.Next.Range.Text = "1";
                                if (c.Range.Text.ToString().Contains("Name"))
                                     c.Next.Range.Text = "Haider";
  if (c.Range.Text.ToString().Contains("Address"))
                                    c.Next.Range.Text = "Allahabad";                     
                            }
                        }
//saving document
                        oDoc.Save();
                    }                   
                }
//closing document
                oDoc.Close(ref o,ref o,ref o);
            }
            catch (Exception ex)
            {
                oDoc.Close(ref o, ref o, ref o);
                 MessageBox.Show(ex.Message);
            }
            
        }

Screen shot