1 using Microsoft.Office.Core;
2 using Word = Microsoft.Office.Interop.Word;
3 using Excel = Microsoft.Office.Interop.Excel;
4 using PowerPoint = Microsoft.Office.Interop.PowerPoint;

 1  public string ReadFile()
 2         {
 3             string text = string.Empty;
 4             Word.ApplicationClass app = null;
 5             Word.Document doc = null;
 6             object readOnly = true;
 7             object missing = System.Reflection.Missing.Value;
 8             object fileName = this.FileInstance.FullName;
 9             try
10             {
11                 app = new Microsoft.Office.Interop.Word.ApplicationClass();
12                 doc = app.Documents.Open(ref fileName, ref missing, ref readOnly, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing);
13                 text = doc.Content.Text.Replace("\r", string.Empty).Replace("\n", string.Empty).Replace("\t", string.Empty);
14             }
15             catch
16             {
17                 
18             }
19             finally
20             {
21                 doc.Close(ref missing, ref missing, ref missing);
22                 doc = null;
23                 app.Quit(ref missing, ref missing, ref missing);
24                 app = null;
25             }
26             return text;
27         }

 1 public string ReadFile()
 2         {
 3             string text = string.Empty;
 4             Excel.ApplicationClass app = null;
 5             Excel.Workbook book = null;
 6             object readOnly = true;
 7             object missing = System.Reflection.Missing.Value;
 8             object fileName = this.FileInstance.FullName;
 9             try
10             {
11                 app = new Microsoft.Office.Interop.Excel.ApplicationClass();
12                 book = app.Workbooks.Open(fileName.ToString(), missing, readOnly, missing, missing, missing, missing, missing, missing, missing, missing, missing, missing, missing, missing);
13                 foreach (Excel.Worksheet sheet in book.Sheets)
14                 {
15                     for (int i = 1; i <= sheet.UsedRange.Cells.Rows.Count; i++)
16                     {
17                         for (int j = 1; j <= sheet.UsedRange.Cells.Columns.Count; j++)
18                         {
19                             text += ((Excel.Range)sheet.Cells[i, j]).Text.ToString().Replace("\r", string.Empty).Replace("\n", string.Empty).Replace("\t", string.Empty) + " ";
20                         }
21                     }
22                 }
23             }
24             catch
25             {
26 
27             }
28             finally
29             {
30                 book.Close(missing, fileName, missing);
31                 book = null;
32                 app.Quit();
33                 app = null;
34             }
35             return text;
36         }

 1   public string ReadFile()
 2         {
 3             string text = string.Empty;
 4             Excel.ApplicationClass app = null;
 5             Excel.Workbook book = null;
 6             object readOnly = true;
 7             object missing = System.Reflection.Missing.Value;
 8             object fileName = this.FileInstance.FullName;
 9             try
10             {
11                 app = new Microsoft.Office.Interop.Excel.ApplicationClass();
12                 book = app.Workbooks.Open(fileName.ToString(), missing, readOnly, missing, missing, missing, missing, missing, missing, missing, missing, missing, missing, missing, missing);
13                 foreach (Excel.Worksheet sheet in book.Sheets)
14                 {
15                     for (int i = 1; i <= sheet.Rows.Count; i++)
16                     {
17                         for (int j = 1; j <= sheet.Columns.Count; j++)
18                         {
19                             text += ((Excel.Range)sheet.Cells[i, j]).Text.ToString().Replace("\r", string.Empty).Replace("\n", string.Empty).Replace("\t", string.Empty) + " ";
20                         }
21                     }
22                 }
23             }
24             catch
25             {
26 
27             }
28             finally
29             {
30                 book.Close(missing, fileName, missing);
31                 book = null;
32                 app.Quit();
33                 app = null;
34             }
35             return text;
36         }