userform textbox to display active sheet name - excel

Question

In my workbook there are 50 worksheets, I have created a userform which pop up a textbox which can help me change the sheet name now I want that when I toggle through different worksheets then the current worksheet name should display in that textbox and then I will modify the sheet name with the code which is stated below.
Can you please tell me a code line with the help of which the textbox displays the current worksheet name.
Please find below the code with the help of which I can change the existing worksheet name by typing the name in the textbox Sheetnametext
Private Sub Sheetnametext_Change()
'If the length of the entry is greater than 31 characters, disallow the entry.
If Len(Sheetnametext) > 31 Then
MsgBox "Worksheet tab names cannot be greater than 31 characters in length." & vbCrLf & "You entered " & mysheetname & ", which has " & Len(mysheetname) & " characters.", , "Keep it under 31 characters"
Exit Sub
End If
'Sheet tab names cannot contain the characters /, \, [, ], *, ?, or :. 'Verify that none of these characters are present in the cell's entry.
Dim IllegalCharacter(1 To 7) As String, i As Integer
IllegalCharacter(1) = "/"
IllegalCharacter(2) = "\"
IllegalCharacter(3) = "["
IllegalCharacter(4) = "]"
IllegalCharacter(5) = "*"
IllegalCharacter(6) = "?"
IllegalCharacter(7) = ":"
For i = 1 To 7
If InStr(Sheetnametext, (IllegalCharacter(i))) > 0 Then
MsgBox "You used a character that violates sheet naming rules." & vbCrLf & vbCrLf & "Please re-enter a sheet name without the ''" & IllegalCharacter(i) & "'' character.", 48, "Not a possible sheet name !!"
Exit Sub
End If
Next i
'Verify that the proposed sheet name does not already exist in the workbook.
Dim strSheetName As String, wks As Worksheet, bln As Boolean
strSheetName = Trim(Sheetnametext)
On Error Resume Next
Set wks = ActiveWorkbook.Worksheets(strSheetName)
On Error Resume Next
If Not wks Is Nothing Then
bln = True
Else
bln = False
Err.Clear
End If
'History is a reserved word, so a sheet cannot be named History.
If UCase(mysheetname) = "HISTORY" Then
MsgBox "A sheet cannot be named History, which is a reserved word.", 48, "Not allowed"
Exit Sub
End If
'If the worksheet name does not already exist, name the active sheet as the InputBox entry.
'Otherwise, advise the user that duplicate sheet names are not allowed.
If bln = False Then
ActiveSheet.Name = strSheetName
End If
End Sub

Answer 1

Astha better you use a Listbox to navigate Sheets in Workbook,, try this code.
Private Sub UserForm_Initialize()
Dim N As Long
For N = 1 To ActiveWorkbook.Sheets.Count ListBox1.AddItem ActiveWorkbook.Sheets(N).Name
Next N
End Sub