Today, I will teach you how to open a file, save a file, select a color and font of the corresponding text in the RichTextBox in Visual Basic 2008. With this, you can save the file, open the file that you have created and you can change the color and the font of the text in the RichTextBox.

Let’s Begin:

1.Open Visual Studio.
2.Create a new Project.
3.Set the Form just like this.



Go to the code view and do this following code for the “Open File” Button. This method serves to open the .txt file and the content will appear in the RichTextBox.

1. Private
   
   Sub
   
   Button1_Click(
   
   ByVal
   
   sender As
   
   System.
   
   Object
   
   , ByVal
   
   e As
   
   System.
   
   EventArgs
   
   )
   
   Handles
   
   Button1.
   
   Click
   
2. Try
   
3. With
   
   OpenFileDialog1
   
4. 
   
5. 'CHECK THE SELECTED FILE IF IT EXIST OTHERWISE THE DIALOG BOX WILL DISPLAY A WARNING.
   
6. .
   
   CheckFileExists
   
   =
   
   True
   
7. 
   
8. 
   
9. 'CHECK THE SELECTED PATH IF IT EXIST OTHERWISE THE DIALOG BOX WILL DISPLAY A WARNING.
   
10. .
    
    CheckPathExists
    
    =
    
    True
    
11. 
    
12. 
    
13. 'GET AND SET THE DEFAULT EXTENSION
    
14. .
    
    DefaultExt
    
    =
    
    "txt"
    
15. 
    
16. 
    
17. 'RETURN THE FILE LINKED TO THE LNK FILE
    
18. .
    
    DereferenceLinks
    
    =
    
    True
    
19. 
    
20. 'SET THE FILE NAME TO EMPTY
    
21. .
    
    FileName
    
    =
    
    ""
    
22. 
    
23. 'FILTERING THE FILES
    
24. .
    
    Filter
    
    =
    
    "Text files (*.txt)|*.txt|All files|*.*"
    
25. 
    
26. 'SET THIS FOR ONE FILE SELECTION ONLY.
    
27. .
    
    Multiselect
    
    =
    
    False
    
28. 
    
29. 
    
30. 
    
31. 'SET THIS TO PUT THE CURRENT FOLDER BACK TO WHERE IT HAS STARTED.
    
32. .
    
    RestoreDirectory
    
    =
    
    True
    
33. 
    
34. 'SET THE TITLE OF THE DIALOG BOX.
    
35. .
    
    Title
    
    =
    
    "Select a file to open"
    
36. 
    
37. 'ACCEPT ONLY THE VALID WIN32 FILE NAMES.
    
38. .
    
    ValidateNames
    
    =
    
    True
    
39. 
    
40. If
    
    .
    
    ShowDialog
    
    =
    
    Windows.
    
    Forms
    
    .
    
    DialogResult
    
    .
    
    OK
    
    Then
    
41. Try
    
42. RichTextBox1.
    
    Text
    
    =
    
    My.
    
    Computer
    
    .
    
    FileSystem
    
    .
    
    ReadAllText
    
    (
    
    .
    
    FileName
    
    )
    
43. Catch
    
    fileException As
    
    Exception
    
44. Throw
    
    fileException
    
45. End
    
    Try
    
46. End
    
    If
    
47. 
    
48. End
    
    With
    
49. Catch
    
    ex As
    
    Exception
    
50. MsgBox
    
    (
    
    ex.
    
    Message
    
    , MsgBoxStyle.
    
    Exclamation
    
    , Me
    
    .
    
    Text
    
    )
    
51. End
    
    Try
    
52. End
    
    Sub
    

This code is for the “Save File” Button. This method serves to save the text that you have created in the RichTextBox.

1. Private
   
   Sub
   
   Button2_Click(
   
   ByVal
   
   sender As
   
   System.
   
   Object
   
   , ByVal
   
   e As
   
   System.
   
   EventArgs
   
   )
   
   Handles
   
   Button2.
   
   Click
   
2. Try
   
3. With
   
   SaveFileDialog1
   
4. 'IF THE USER NEGLECTS THE FILE ETENSION THEN, ADD THE DEFUALT EXTENSION.
   
5. .
   
   AddExtension
   
   =
   
   True
   
6. 
   
7. 
   
8. 'CHECK IF THE OUTPUT PATH ACTUALLY EXISTS
   
9. 'BEFORE CREATING A NEW FILE AND BEFORE OVERWRITING.
   
10. 'THE FOLLOWING VALUES ARE IN ITS DEFUALT FORM.
    
11. .
    
    CheckPathExists
    
    =
    
    True
    
12. .
    
    CreatePrompt
    
    =
    
    False
    
13. .
    
    OverwritePrompt
    
    =
    
    True
    
14. .
    
    ValidateNames
    
    =
    
    True
    
15. 
    
16. 'GET AND SET THE DEFAULT EXTENSION
    
17. .
    
    DefaultExt
    
    =
    
    "txt"
    
18. 
    
19. 'FILLTERING THE FILES THAT YOU HAVE SAVED.
    
20. .
    
    Filter
    
    =
    
    "Text files (*.txt)|*.txt|"
    
    &
    
    "All files|*.*"
    
21. .
    
    FilterIndex
    
    =
    
    1
    
22. 
    
23. If
    
    .
    
    ShowDialog
    
    (
    
    )
    
    =
    
    Windows.
    
    Forms
    
    .
    
    DialogResult
    
    .
    
    OK
    
    Then
    
24. My.
    
    Computer
    
    .
    
    FileSystem
    
    .
    
    WriteAllText
    
    (
    
    .
    
    FileName
    
    , RichTextBox1.
    
    Text
    
    , False
    
    )
    
25. End
    
    If
    
26. 
    
27. End
    
    With
    
28. Catch
    
    ex As
    
    Exception
    
29. MsgBox
    
    (
    
    ex.
    
    Message
    
    , MsgBoxStyle.
    
    Exclamation
    
    , Me
    
    .
    
    Text
    
    )
    
30. End
    
    Try
    
31. End
    
    Sub
    

After that, do this following code for changing the color of the text in the RichTextBox.

1. Private
   
   Sub
   
   Button3_Click(
   
   ByVal
   
   sender As
   
   System.
   
   Object
   
   , ByVal
   
   e As
   
   System.
   
   EventArgs
   
   )
   
   Handles
   
   Button3.
   
   Click
   
2. 'SET THE RED, GREEN, AND BLUE IN THE CUSTOM COLORS SELECTION
   
3. Static
   
   Custom_Colors(
   
   )
   
   As
   
   Integer
   
   =
   
   {
   
   RGB(
   
   255
   
   , 0
   
   , 0
   
   )
   
   , RGB(
   
   0
   
   , 255
   
   , 0
   
   )
   
   , RGB(
   
   0
   
   , 0
   
   , 255
   
   )
   
   }
   
4. 
   
5. Try
   
6. With
   
   ColorDialog1
   
7. 
   
8. 'SET THE COLORS THAT YOU HAVE SELECTED TO MATCH
   
9. 'THE CURRENTLY COLORS THAT WAS USED IN THE RICHTEXTBOX.
   
10. .
    
    Color
    
    =
    
    RichTextBox1.
    
    ForeColor
    
11. 
    
12. 'SET THE ARRAY VARIABLE THAT YOU HAVE SUPPLIED
    
13. 'AND FILL IT TO THE CUSTOM COLORS ON THE DIALOG BOX.
    
14. .
    
    CustomColors
    
    =
    
    Custom_Colors
    
15. 
    
16. 
    
17. 'IT ALLOWS YOU TO CREATE CUSTOM COLORS.
    
18. .
    
    AllowFullOpen
    
    =
    
    True
    
19. 
    
20. 
    
21. 'THE BASIC COLORS WILL DISPLAY.
    
22. .
    
    AnyColor
    
    =
    
    True
    
23. 
    
24. 
    
25. 'THE DIALOG BOX WILL DISPLAY WITH THE CUSTOM COLOR SETTINGS, SIDE OPEN, AS WELL.
    
26. .
    
    FullOpen
    
    =
    
    False
    
27. 
    
28. 
    
29. 'SOLID COLORS ARE ALLOWED.
    
30. .
    
    SolidColorOnly
    
    =
    
    True
    
31. 
    
32. If
    
    .
    
    ShowDialog
    
    (
    
    )
    
    =
    
    Windows.
    
    Forms
    
    .
    
    DialogResult
    
    .
    
    OK
    
    Then
    
33. RichTextBox1.
    
    ForeColor
    
    =
    
    .
    
    Color
    
34. 'STORE THE CUSTOM COLORS FOR FUTURE USE.
    
35. Custom_Colors =
    
    .
    
    CustomColors
    
36. End
    
    If
    
37. 
    
38. 
    
39. 'RESET ALL THE COLORS IN THE DIALOG BOX.
    
40. ColorDialog1.
    
    Reset
    
    (
    
    )
    
41. 
    
42. End
    
    With
    
43. 
    
44. 
    
45. Catch
    
    ex As
    
    Exception
    
46. MsgBox
    
    (
    
    ex.
    
    Message
    
    , MsgBoxStyle.
    
    Exclamation
    
    , Me
    
    .
    
    Text
    
    )
    
47. End
    
    Try
    
48. End
    
    Sub
    

Lastly, do this following code for changing the font of the text in the RichTetBox.

1. Private
   
   Sub
   
   Button4_Click(
   
   ByVal
   
   sender As
   
   System.
   
   Object
   
   , ByVal
   
   e As
   
   System.
   
   EventArgs
   
   )
   
   Handles
   
   Button4.
   
   Click
   
2. Try
   
3. With
   
   FontDialog1
   
4. 
   
5. 'SET THE DIALOG BOX TO MATCH THE FONT THAT YOU USED IN THE RICHTEXTBOX.
   
6. .
   
   Font
   
   =
   
   RichTextBox1.
   
   Font
   
7. 'SET THE DEFAULT COLOR.
   
8. .
   
   Color
   
   =
   
   RichTextBox1.
   
   ForeColor
   
9. 
   
10. 
    
11. 'THE CHOICES OF THE COLORS WILL APPEAR.
    
12. .
    
    ShowColor
    
    =
    
    True
    
13. 
    
14. 
    
15. 'THE APPLY BUTTON APPEARS ON THE DIALOG BOX
    
16. .
    
    ShowApply
    
    =
    
    True
    
17. 
    
18. 
    
19. 'SET THE EFFECTS TO BE SELECTED.
    
20. .
    
    ShowEffects
    
    =
    
    True
    
21. 
    
22. 
    
23. 'DON'T ALLOW SIMULATION, VECTOR FONTS OR VERTICAL FONTS.
    
24. ' THEN, LET THE USER CHANGE THE CHARACTER SET.
    
25. .
    
    AllowScriptChange
    
    =
    
    True
    
26. .
    
    AllowSimulations
    
    =
    
    False
    
27. .
    
    AllowVectorFonts
    
    =
    
    False
    
28. .
    
    AllowVerticalFonts
    
    =
    
    False
    
29. 
    
30. 
    
31. 'SET THE FIXED AND PROPORTIONAL FONTS.
    
32. .
    
    FixedPitchOnly
    
    =
    
    False
    
33. 'ALLOW ONLY FONTS THAT EXIST.
    
34. .
    
    FontMustExist
    
    =
    
    True
    
35. 'SET THE MAXIMUM SIZE SELECTABLE FONT SIZE
    
36. .
    
    MaxSize
    
    =
    
    48
    
37. 'SET THE MINIMUM SIZE SELECTABLE FONT SIZE
    
38. .
    
    MinSize
    
    =
    
    8
    
39. 
    
40. 'SET UP THE REQUESTED FONTS.
    
41. If
    
    .
    
    ShowDialog
    
    =
    
    Windows.
    
    Forms
    
    .
    
    DialogResult
    
    .
    
    OK
    
    Then
    
42. RichTextBox1.
    
    Font
    
    =
    
    .
    
    Font
    
43. End
    
    If
    
44. 
    
45. End
    
    With
    
46. Catch
    
    ex As
    
    Exception
    
47. MsgBox
    
    (
    
    ex.
    
    Message
    
    , MsgBoxStyle.
    
    Exclamation
    
    , Me
    
    .
    
    Text
    
    )
    
48. End
    
    Try
    
49. End
    
    Sub
    

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