Question

How to convert char in a string to uppercase by index with VB.NET

Answer 1

Imports System
Imports System.Text
  
Public Class Test
	Public Shared Function string_char_toupper(s As String, idx as Integer) As String
       	Dim len As Integer = s.Length
		
		If (idx > len Or idx < 0) Then 
			return s
		End If
		
        Dim sb As StringBuilder = new StringBuilder(s)
  
         sb(idx) = Char.ToUpper(sb(idx))
  
         return sb.ToString()
    End Function
  
    Public Shared Sub Main()
		Dim s As String = "vb.net programming"
        
        s = string_char_toupper(s, 4)
     
        Console.Write(s)
    End Sub
End Class
  

  
' run:
'
' vb.nEt programming

 

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