Convert.ToSingle (String) converts string to single-precision floating-point number.
Class Sample Public Shared Sub Main() Dim values() As String = { "-1,999.99999", "1AFF", "1e-35","999.99999", "1.99e999"} Dim result As Single For Each value As String In values Try result = Convert.ToSingle(value) Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.", _ value.GetType().Name, value, _ result.GetType().Name, result) Catch e As FormatException Console.WriteLine("Unable to convert '{0}' to a Single.", value) Catch e As OverflowException Console.WriteLine("'{0}' is outside the range of a Single.", value) End Try Next End Sub End Class