How can we apply to string having existing Font Style in Rich Textbox?

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I have a string as "Hello World" in the RichTextBox. I am selecting the each word and applying style.In this string "Hello" is bold and having strike-Through.Suppose I want to apply underline to the complete Text (Hello world).The previous style for which the "Hello" has is removing and new style is appending.This is a migrated project to VB.NET when we do the same in VB6 it is working perfectly.It is not working in VB.NET.

VB

If richTb1.SelectionFont.Underline Then
            richTb1.SelectionFont = VB6.FontChangeUnderline(richTb1.SelectionFont, False)
Else
            richTb1.SelectionFont = VB6.FontChangeUnderline(richTb1.SelectionFont, True)
End If

Posted 20-Feb-13 2:40am

hemantwithu

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hemantwithu · Answer 1 · 2013-03-11T02:37:00

At last I had fixed the issue by restyling the text char by char .See my solution

VB

If rtfBox.SelectionFont.Bold Then
            For x As Integer = selectionStart To selectionEnd - 1
                rtfBox.Select(x, 1)
                rtfBox.SelectionFont = VB6.FontChangeBold(rtfBox.SelectionFont, False)
            Next
Else
            For x As Integer = selectionStart To selectionEnd - 1
                rtfBox.Select(x, 1)
                rtfBox.SelectionFont = VB6.FontChangeBold(rtfBox.SelectionFont, True)
            Next
End If