I am using VB.NET code.
I have got the below string.
http://localhost:3282/ISS/Training/SearchTrainerData.aspx
Now I want to split
Your "string" is obviously a URL which means you should use the System.Uri class.
Dim url As Uri = New Uri("http://localhost:3282/ISS/Training/SearchTrainerData.aspx")
Dim segments As String() = url.Segments
Dim str As String = segments(segments.Length - 1)
This will also allow you to get all kinds of other interesting information about your "string" without resorting to manual (and error-prone) parsing.