Read Number from a String

<div>

<asp:TextBox ID="txtInput" runat="server"></asp:TextBox><br />

<asp:Button ID="btncollect" runat="server" Text="CollectNumber" OnClick="btncollect_Click" /><br />

<asp:Label ID="lblMessage" runat="server"></asp:Label>

</div>

</form>

</body>

</html>

Imports System.Text.RegularExpressions

Partial Class _Default

Inherits System.Web.UI.Page

Protected Sub btncollect_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btncollect.Click

lblMessage.Text = CollectNumbers(txtInput.Text)

End Sub

Public Function CollectNumbers(ByVal collectnum As String) As String

Return String.Join(Nothing, Regex.Split(collectnum, "[^\d]"))

End Function

End Class