Question

I am using ASP.NET with VB.NET.

This is my code

Dim Total As Double
Total = Convert.ToDouble(lblTotal.Text.Substring(4, 20))

The value of lblTotal is

ABC20.00

I just want to trim the value to give me the 20.00 and convert it ToDouble

End Result Must be

20.00

C# code will also help me undertand what needs to happen and why I am getting the error messsage

Index and length must refer to a location within the string. Parameter name: length

Answer 1

try

Total = Convert.ToDouble(lblTotal.Text.Substring(4))

see http://msdn.microsoft.com/en-us/library/hxthx5h6.aspx

EDIT – as per comment:

The OP used in his example code 4 as starting index but the sample data would have to use 3 as starting index to achieve the result…