StringBuilder.Replace replaces all occurrences of a character in this instance with another specified character.

 

Imports System
Imports System.Text

Class Sample
   Public Shared Sub Main()
      Dim str As String = "!#"
      Dim sb As New StringBuilder(str)

      sb.Replace("#"c, "!"c, 15, 29)
      Show(sb)
   End Sub

   Public Shared Sub Show(sbs As StringBuilder)
      Console.WriteLine("{0}", sbs.ToString())
   End Sub 
End Class

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StringBuilder.Replace replaces all occurrences of a character in this instance with another specified character. : StringBuilder « Language Basics « VB.Net

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