Count number of characters after specific character in textbox - vb.net

Question

using winforms / vb.net
I am trying to count how many characters exist in "textbox3" after a specific character "." in a textbox.
examples:
2adf = 0 (no "." exists)
2adf. = 0
2adf.2 = 1
2adf.2a = 2
2adf.2af = 3
2adf.2afe = 4
I already have a function to search if there is a "."
if (CountCharacter(TextBox3.Text, ".") = 1) then
'a "." exists so count number of characters after "."
end if
Public Function CountCharacter(ByVal value As String, ByVal ch As Char) As Integer
Dim cnt As Integer = 0
For Each c As Char In value
If c = ch Then cnt += 1
Next
Return cnt
End Function
I am not sure how to check the count after the "." though

Answer 1

You could use the string.IndexOf method for this task
Sub Main
Dim test = "2adf.2afe"
Dim result = CountCharsAfter(test, "."c)
Console.WriteLine(result)
End Sub
Public Function CountCharsAfter(input as string, charToSearch as Char) as Integer
DIm pos = input.LastIndexOf(charToSearch)
if pos = -1 then
return 0
else
return input.Length - (pos + 1)
End if
End Function

Answer 2

Try this
Dim NoChar As Integer = CalculateChra("12adf.2afe", ".")
Private Function CalculateChra(ByVal V_String As String, ByVal LastChar As Char) As Integer
Dim Start As String = Split(V_String, LastChar)(0) & "."
Dim M As String = V_String.Substring(Start.Length)
Return M.Length
End Function

Answer 3

dim n,cnt as integer
n=0
cnt=0
Private Sub TextBox1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox1.KeyPress
If e.KeyChar = Chr(46) Then
n = Len(TextBox1.Text)
End If
If n <> 0 Then
cnt += 1
End If
MsgBox(" no.of charectors after '.' is/are : " & cnt - 1)
End Sub