Issue to the line

To locate the place causing the exception "Index and length must refer to a location within the string," you can utilize the StackTrace property of the exception object. When an exception is thrown, the StackTrace provides a string representation of the immediate frames on the call stack, which can help you trace back to where the error occurred in your code.

Here’s a general approach to handle this:

1. Catch the Exception: Use a try/catch block around the code that may throw the exception.
2. Inspect the StackTrace: In the catch block, access the StackTrace property of the caught exception to get detailed information about where the exception occurred.
3. Debugging: Use the information from the StackTrace to identify the exact line in your code that caused the issue. This will typically include the method name and the line number.

Here’s a simple example:

try
{
    // Code that may throw an exception
}
catch (Exception ex)
{
    Console.WriteLine("Exception Message: " + ex.Message);
    Console.WriteLine("Stack Trace: " + ex.StackTrace);
}

By printing the StackTrace, you can find the exact location in your code where the exception was thrown, which will help you to debug the issue effectively.

References:

• How to use the try/catch block to catch exceptions
• Exception.StackTrace Property