Question

How to convert part of a string to lowercase start from specific index in VB.NET

Answer 1

Imports System
Imports System.Text
  
Public Class Test
	Public Shared Function convert_part_to_lowercase(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)
  
		For i As Integer = 0 To len - 1
			if (i >= idx And (s(i) >= "A" And s(i) <= "Z")) Then
				sb(i) = Char.ToLower(sb(i))
			End If
		Next
		
         return sb.ToString()
    End Function
  
    Public Shared Sub Main()
		Dim s As String = "VB.NET PROGRAMMING"
        
        s = convert_part_to_lowercase(s, 4)
     
        Console.Write(s)
    End Sub
End Class
  

  
' run:
'
' VB.Net programming

 

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